Volkswagen ID.4 2021 Workshop Manual
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Volkswagen ID.4 2021 Workshop Manual

Volkswagen ID.4 2021 Workshop Manual

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Service
Workshop Manual
ID.4 2021 ➤
Brake system
Edition 07.2021
Service Department. Technical Information

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Summary of Contents for Volkswagen ID.4 2021

  • Page 1 Service Workshop Manual ID.4 2021 ➤ Brake system Edition 07.2021 Service Department. Technical Information...
  • Page 2 Service List of Workshop Manual Repair Groups R e p a i r G r o u p 00 - Technical data 45 - Anti-lock brake system 46 - Brakes - mechanism 47 - Brakes - hydraulics Technical information should always be available to the foremen and mechanics, because their careful and constant adherence to the instructions is essential to ensure vehicle road-worthiness and safety.

  • Page 3: Table Of Contents

    ID.4 2021 ➤ Brake system - Edition 07.2021 Contents 00 - Technical data ........... .
  • Page 4 ID.4 2021 ➤ Brake system - Edition 07.2021 Removing and installing brake pedal ......... .

  • Page 5: Technical Data

    ID.4 2021 ➤ Brake system - Edition 07.2021 00 – Technical data Safety information and repair notes 1000579J4169.001.1 - 07.2021 Safety information ⇒ Safety information and repair notes; Rep. gr. 00; Safety infor‐ mation Repair notes ⇒ Safety information and repair notes; Rep. gr. 00; Repair notes...

  • Page 6: Identification

    ID.4 2021 ➤ Brake system - Edition 07.2021 Identification Allocation of PR number - brakes 2.1.1 Front brakes Relevant information on the installed brakes can be found in the vehicle-specific notes in ElsaPro/erWin. ♦ For allocation, refer to ⇒ Electronic parts catalogue (ETKA) .

  • Page 7: Technical Data For Brakes

    ID.4 2021 ➤ Brake system - Edition 07.2021 Technical data for brakes Brake master cylinder and brake servo Brake master cylinder Diameter in mm 25.4 Brake servo Electromechanical brake servo Front brakes Front brake, 18”, 1K, 60 in diam. Item PR No.

  • Page 8: Rear Brakes

    ID.4 2021 ➤ Brake system - Edition 07.2021 Item PR No. 1LC, 1LN Brake caliper 18”, 1K, 46/46 in diam. Brake pad, thickness Brake pad, wear limit with‐ out backplate Brake carrier Wheel bearing housing with wheel bearing Brake disc Diam‐...
  • Page 9 ID.4 2021 ➤ Brake system - Edition 07.2021 Item PR No. Wheel brake 23.8 cylinder Brake lining, width Brake lining, 4.55 thickness Brake lining, minimal thick‐ ness Brake drum Diam‐ 279.8 eter in Brake drum, Diam‐ 280.8 wear limit eter in...

  • Page 10: Brake Test

    Brake test Vehicle checks Carry out the brake test on a single-axle roller dynamometer. The maximum test speed must not exceed 6 km/h. The test rigs authorised by Volkswagen fulfil these require‐ ments. Checking electromechanical parking brake Activate “TÜV mode”: Important •...

  • Page 11: Anti-Lock Brake System

    ID.4 2021 ➤ Brake system - Edition 07.2021 45 – Anti-lock brake system Safety information and repair notes Safety information ⇒ Safety information and repair notes; Rep. gr. 00; Safety infor‐ mation Repair notes ⇒ Safety information and repair notes; Rep. gr. 00; Repair notes...

  • Page 12: Overview Of Fitting Locations

    ID.4 2021 ➤ Brake system - Edition 07.2021 Overview of fitting locations Overview of fitting locations – ABS/ESP The overview shows a left-hand drive vehicle as an example. Rep. gr.45 - Anti-lock brake system...
  • Page 13 ID.4 2021 ➤ Brake system - Edition 07.2021 1 - ABS control unit -J104- / ABS hydraulic unit -N55- ❑ Fitting location for right- hand drive vehicles: in vehicle front end on front passenger side ❑ ⇒ Rep. gr. 45; Assem‐...

  • Page 14: Control Unit And Hydraulic Unit

    ID.4 2021 ➤ Brake system - Edition 07.2021 Control unit and hydraulic unit Assembly overview – control unit and hydraulic unit 3.1.1 Assembly overview – control unit and hydraulic unit, left-hand drive vehi‐ cles Rep. gr.45 - Anti-lock brake system...
  • Page 15 ID.4 2021 ➤ Brake system - Edition 07.2021 1 - ABS control unit -J104- ❑ ⇒ Rep. gr. 45; Remov‐ ing and installing ABS control unit [J104]/ABS hydraulic unit [N55] 2 - Brake line to rear right wheel brake cylinder ❑...
  • Page 16 ID.4 2021 ➤ Brake system - Edition 07.2021 ❑ 6 mm in diameter and union screw with M12 × 1 thread ❑ mit handelsüblichem Standardwerkzeug: 14 Nm ❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm...
  • Page 17 ID.4 2021 ➤ Brake system - Edition 07.2021 1 - Brake line to rear right wheel brake cylinder ❑ 5.25 mm in diameter and union screw with short M12 × 1 thread ❑ mit handelsüblichem Standardwerkzeug: 14 Nm ❑ With special tools...

  • Page 18: Removing And Installing Abs Control Unit [J104]/Abs Hydraulic Unit [N55]

    ID.4 2021 ➤ Brake system - Edition 07.2021 10 - Rubber mounting 11 - Bracket 12 - Bolt ❑ 8 Nm 13 - ABS control unit -J104- with ABS hydraulic unit -N55- ❑ ⇒ Rep. gr. 45; Removing and installing ABS control unit [J104]/ABS hydraulic unit [N55] 14 - Brake line from secondary piston circuit to hydraulic unit ❑...
  • Page 19 ID.4 2021 ➤ Brake system - Edition 07.2021 M10 sealing plugs M12 sealing plugs Removing The ABS control unit -J104- -1- will henceforth be referred to as “control unit”. The ABS hydraulic unit -N55- -2- will henceforth be referred to as “hydraulic unit”.
  • Page 20 ID.4 2021 ➤ Brake system - Edition 07.2021 – Connect bleeder hose of bleeder bottle to bleeder screw of front left brake caliper -1- . – Open bleeder screw. – Connect bleeder hose of second bleeder bottle to bleeder screw of rear left wheel brake cylinder -1- .
  • Page 21 ID.4 2021 ➤ Brake system - Edition 07.2021 NOTICE Risk of damage due to corrosion. – Make sure that no brake fluid gets onto electrical contacts. – Place sufficient lint-free cleaning cloths in area of electrical connectors. – First, mark the two brake lines -5- and -6- , and unscrew them from the hydraulic unit.
  • Page 22 ID.4 2021 ➤ Brake system - Edition 07.2021 – Tighten break line union screws in sequence -1- through -6- . – Remove brake pedal actuator -V.A.G 1869/2- . – ⇒ Rep. gr. 47; Bleed hydraulic system following standard procedure .
  • Page 23 ID.4 2021 ➤ Brake system - Edition 07.2021 ♦ assembly tool -V.A.G 1410/8- ♦ brake pedal actuator -V.A.G 1869/2- ♦ engine bung set -VAS 6122- For sealing plugs (assembly parts), see electronic parts cata‐ logue (ETKA) M10 sealing plugs M12 sealing plugs...
  • Page 24 ID.4 2021 ➤ Brake system - Edition 07.2021 – Connect bleeder hose of bleeder bottle to bleeder screw of front left brake caliper -1- . – Open bleeder screw. – Connect bleeder hose of second bleeder bottle to bleeder screw of rear left wheel brake cylinder -1- .
  • Page 25 ID.4 2021 ➤ Brake system - Edition 07.2021 NOTICE Risk of damage due to corrosion. – Make sure that no brake fluid gets onto electrical contacts. – Place sufficient lint-free cleaning cloths in area of electrical connectors. – First, mark the two brake lines -5- and -6- , and unscrew them from the hydraulic unit.

  • Page 26: Connecting Brake Lines To Hydraulic Unit

    ID.4 2021 ➤ Brake system - Edition 07.2021 – Tighten break line union screws in sequence -1- through -6- . – Remove brake pedal actuator -V.A.G 1869/2- . – ⇒ Rep. gr. 47; Bleed hydraulic system following standard procedure .
  • Page 27 ID.4 2021 ➤ Brake system - Edition 07.2021 1 - Hydraulic unit to rear right wheel brake cylinder ❑ 5.25 mm in diameter and union screw with short M12 × 1 thread ❑ Specified torque ⇒ Rep. gr. 45; Assem‐...
  • Page 28 ID.4 2021 ➤ Brake system - Edition 07.2021 1 - Brake servo and brake master cylinder 2 - Secondary piston circuit of brake master cylinder to hy‐ draulic unit ❑ Specified torque ⇒ Rep. gr. 47; Assem‐ bly overview – brake servo/brake master cyl‐...
  • Page 29 ID.4 2021 ➤ Brake system - Edition 07.2021 1 - Hydraulic unit to rear right wheel brake cylinder ❑ 5.25 mm in diameter and union screw with short M12 × 1 thread ❑ Specified torque ⇒ Rep. gr. 45; Assem‐...
  • Page 30 ID.4 2021 ➤ Brake system - Edition 07.2021 1 - Brake servo and brake master cylinder 2 - Secondary piston circuit of brake master cylinder to hy‐ draulic unit ❑ Specified torque ⇒ Rep. gr. 47; Assem‐ bly overview – brake servo/brake master cyl‐...

  • Page 31: Sensors

    ID.4 2021 ➤ Brake system - Edition 07.2021 Sensors Assembly overview – speed sensors on front axle The overview is shown for the left side of the vehicle as an example. 1 - Front left speed sensor -G47- / front right speed sen‐...

  • Page 32: Removing And Installing Speed Sensor On Front Axle [G45]/[G47]

    ID.4 2021 ➤ Brake system - Edition 07.2021 1 - Bolt ❑ 8 Nm 2 - Rear left speed sensor - G46- / rear right speed sensor -G44- ❑ ⇒ Rep. gr. 45; Remov‐ ing and installing speed sensor on rear axle...

  • Page 33: Removing And Installing Speed Sensor On Rear Axle [G44]/[G46]

    ID.4 2021 ➤ Brake system - Edition 07.2021 – Unscrew bolt -2- , and pull front speed sensor -1- out of wheel bearing housing. Installing Install in reverse order of removal, observing the following: – Before inserting speed sensor, clean inner surface of hole, and coat speed sensor all-round with high-temperature paste ⇒...

  • Page 34: Checking Abs Sensor Ring

    ID.4 2021 ➤ Brake system - Edition 07.2021 Installing Install in reverse order of removal, observing the following: – Before inserting rear speed sensor, clean inner surface of hole, and coat rear speed sensor all-round with high-temper‐ ature paste ⇒ Electronic parts catalogue (ETKA).
  • Page 35 ID.4 2021 ➤ Brake system - Edition 07.2021 A - ABS sensor ring is OK B - ABS sensor ring is defective 4. Sensors...

  • Page 36: Brakes - Mechanism

    ID.4 2021 ➤ Brake system - Edition 07.2021 46 – Brakes - mechanism Safety information and repair notes Safety information ⇒ Safety information and repair notes; Rep. gr. 00; Safety infor‐ mation Repair notes ⇒ Safety information and repair notes; Rep. gr. 00; Repair notes...

  • Page 37: Front Brake

    ID.4 2021 ➤ Brake system - Edition 07.2021 Front brake Assembly overview – front brake 2.1.1 Assembly overview – front brake The overview is shown for the left side of vehicle as an exam‐ ple. 2. Front brake...
  • Page 38 ID.4 2021 ➤ Brake system - Edition 07.2021 1 - Ribbed bolt ❑ Qty. 2 ❑ 200 Nm 2 - Wheel bearing housing ❑ ⇒ Running gear, axles, steering; Rep. gr. 42; Wheel bearing, trailing arm; Assembly over‐ view – wheel bearing 3 - Brake pads ❑...

  • Page 39: Removing And Installing Brake Pads

    ID.4 2021 ➤ Brake system - Edition 07.2021 15 - Brake hose with banjo union and banjo bolt ❑ Ensure correct installation position ❑ Hohlschraube an Bremssattel: 35 Nm 16 - Retaining clip 17 - Brake line ❑ 14 Nm 18 - Bolt ❑...
  • Page 40 ID.4 2021 ➤ Brake system - Edition 07.2021 – Remove brake caliper -1- , and lay it aside so that weight of brake caliper -1- does not strain brake hose. – Secure brake caliper -1- to prevent it from falling.
  • Page 41 ID.4 2021 ➤ Brake system - Edition 07.2021 – Use a screwdriver -A- to lever off pad retainer -1- at position marked with -arrows- . – Use suitable workshop equipment to thoroughly clean con‐ tact surfaces for brake pads on brake carrier and to remove any corrosion.
  • Page 42 ID.4 2021 ➤ Brake system - Edition 07.2021 – Firmly press pad retainers -arrows- onto brake carrier. For directional brake pads – Install directional brake pads marked with “OUTSIDE” -1- on the outer side and those marked with “INSIDE” -2- on the inner side.
  • Page 43 ID.4 2021 ➤ Brake system - Edition 07.2021 – Simultaneously, push brake pad -1- in direction of -arrow B- into recess in brake carrier and against brake disc (direction of -arrow C- ). – Carefully press brake pad retaining springs -arrows- onto brake carrier.

  • Page 44: Removing And Installing Brake Caliper

    ID.4 2021 ➤ Brake system - Edition 07.2021 Firmly depress brake pedal several times with vehicle stationary so that the brake pads are properly seated in their normal oper‐ ating position. – Check brake fluid level. Important • The brake fluid level must be between “Min.” -2- and “Max.”...
  • Page 45 ID.4 2021 ➤ Brake system - Edition 07.2021 – Open bleeder screw. – Fit brake pedal actuator -V.A.G 1869/2- . – Close bleeder screw and remove bleeder bottle. – Unscrew brake hose. – Unscrew hexagon bolts -2- from brake caliper -1- . Counter‐...
  • Page 46 ID.4 2021 ➤ Brake system - Edition 07.2021 – Remove brake pedal actuator -V.A.G 1869/2- . Right side of vehicle – Connect electrical connector of front right brake pad wear sender -G35- . All vehicles (continued) – ⇒ Rep. gr. 47; Bleed hydraulic system following standard procedure .

  • Page 47: Rear Brake

    ID.4 2021 ➤ Brake system - Edition 07.2021 Rear brake Assembly overview – rear brake, drum brake The overview is shown for the left side of the vehicle as an example. 3. Rear brake...
  • Page 48 ID.4 2021 ➤ Brake system - Edition 07.2021 1 - Wheel bearing housing ❑ ⇒ Running gear, axles, steering; Rep. gr. 42; Wheel bearing assem‐ bly; Assembly over‐ view – wheel bearing assembly 2 - Multi-point socket head bolt ❑ ⇒ Running gear, axles, steering;...

  • Page 49: Assembly Overview - Brake Shoes

    ID.4 2021 ➤ Brake system - Edition 07.2021 ❑ Renew after removing ❑ 50 Nm + 180° 19 - Drive shaft ❑ ⇒ Running gear, axles, steering; Rep. gr. 42; Drive shaft; Removing and installing drive shaft Assembly overview – brake shoes The overview is shown for the left side of the vehicle as an example.
  • Page 50 ID.4 2021 ➤ Brake system - Edition 07.2021 1 - Brake carrier 2 - Hold-down pin 3 - Sealing plug 4 - Bolt ❑ 10 Nm 5 - Protective cap for bleeder screw 6 - Bleeder screw ❑ 10 Nm 7 - Pin ❑...

  • Page 51: Removing And Installing Brake Shoes

    ID.4 2021 ➤ Brake system - Edition 07.2021 ❑ ⇒ Rep. gr. 46; Removing and installing brake shoes Removing and installing brake shoes Special tools and workshop equipment required ♦ assembly tool -T30114- ♦ brake drum calliper gauge -VAS 6787- ♦...
  • Page 52 ID.4 2021 ➤ Brake system - Edition 07.2021 – Place brake shoe with parking brake lever -1- in direction of -arrow B- in front of lower support -2- – Unhook lower return spring -3- . – Remove opposing retaining clips -1- using assembly tool -T30114- -2- .
  • Page 53 ID.4 2021 ➤ Brake system - Edition 07.2021 – Use a screwdriver -2- to lever upper return spring -1- out of brake shoe without parking brake lever -3- Installing CAUTION Risk of injury from chemical cleaning agents. Chemical clean‐ ing agents can be highly flammable and can cause eye and skin irritation.
  • Page 54 ID.4 2021 ➤ Brake system - Edition 07.2021 – Install brake shoe with parking brake lever -1- using assem‐ bly tool -T30114- -3- . – Fit retaining clip -2- . – Insert upper return spring -1- in both brake shoes -2- and -3- .
  • Page 55 ID.4 2021 ➤ Brake system - Edition 07.2021 – Use assembly tool -T30114- -2- to insert hold-down pin and retaining clip -1- . – Observe correct position of clips -2- and -4- and return springs -1- and -3- . Important •...
  • Page 56 ID.4 2021 ➤ Brake system - Edition 07.2021 must be free to rotate and it should be possible to install it without applying force. – The “rough adjustment” is achieved by screwing the bolt in direction of -arrow A- onto the thread.
  • Page 57 ID.4 2021 ➤ Brake system - Edition 07.2021 – Clean centre seat of wheel hub of brake drum. Then, treat with anti-corrosion material ⇒ Electronic parts catalogue (ETKA) . – Clean centre hole of brake drum. Then, treat with anti-corro‐...
  • Page 58 ID.4 2021 ➤ Brake system - Edition 07.2021 • “Specified dimension” -a- is 279.1 mm to 279.4 mm. – Fit brake drum, and secure it with bolt. Important • If the brake drum is re-used, remove any corrosion and take account of the maximum permissible wear diameter ⇒...

  • Page 59: Parking Brake

    ID.4 2021 ➤ Brake system - Edition 07.2021 Parking brake Assembly overview – parking brake 1 - Electromechanical parking brake warning lamp -K213- ❑ In control unit with dis‐ play unit for driver infor‐ mation system -J1254- 2 - Electromechanical parking brake button -E538- ❑...

  • Page 60: Removing And Installing Parking Brake Motor [V282]/[V283]

    ID.4 2021 ➤ Brake system - Edition 07.2021 – Removing and installing ABS control unit -J104- ⇒ Rep. gr. 45; Removing and installing ABS control unit [J104]/ABS hydraulic unit [N55] . Removing and installing parking brake motor [V282]/[V283] Removing The left parking brake motor -V282- and right parking brake motor -V283- will henceforth be referred to as “parking brake...

  • Page 61: Brake Pedal

    ID.4 2021 ➤ Brake system - Edition 07.2021 Brake pedal Assembly overview – brake pedal 5.1.1 Assembly overview – brake pedal, left-hand drive vehicles 1 - Mounting bracket ❑ ⇒ Rep. gr. 46; Re‐ moving and installing mounting bracket 2 - Nut ❑...
  • Page 62 ID.4 2021 ➤ Brake system - Edition 07.2021 Stage Specified tor‐ que/turning further angle -1- and -2- 20 Nm -3- and -4- 20 Nm 20 Nm 5.1.2 Assembly overview – brake pedal, right-hand drive vehicles Rep. gr.46 - Brakes - mechanism...
  • Page 63 ID.4 2021 ➤ Brake system - Edition 07.2021 1 - Mounting bracket ❑ ⇒ Rep. gr. 46; Re‐ moving and installing mounting bracket 2 - Nut ❑ Qty. 5 ❑ Renew after removing ❑ Specified torque and tightening sequence ⇒...

  • Page 64: Separating Brake Pedal From Brake Servo

    ID.4 2021 ➤ Brake system - Edition 07.2021 Stage Specified tor‐ que/turning further angle 20 Nm Separating brake pedal from brake ser‐ Special tools and workshop equipment required ♦ Release tool -T10006A- ♦ release tool -T10006A- Removing – For reasons of clarity, the pedal cluster is not shown in the illustrations of the following work procedures.

  • Page 65: Removing And Installing Brake Pedal

    ID.4 2021 ➤ Brake system - Edition 07.2021 – Check engagement by pulling briefly on brake pedal. Removing and installing brake pedal 5.4.1 Removing and installing brake pedal, left-hand drive vehicles Removing – Remove lower steering column trim ⇒ General body repairs, interior;...

  • Page 66: Removing And Installing Mounting Bracket

    ID.4 2021 ➤ Brake system - Edition 07.2021 – Fit clamping washer onto pivot pin. – Continue installation in reverse order of removal. 5.4.2 Removing and installing brake pedal, right-hand drive vehicles Removing – ⇒ Rep. gr. 46; Separate brake pedal from brake servo .
  • Page 67 ID.4 2021 ➤ Brake system - Edition 07.2021 – Remove crash bar ⇒ General body repairs, interior; Rep. gr. 70; Central tube for dash panel; Removing and installing crash bar . – Remove centre console ⇒ General body repairs, interior;...
  • Page 68 ID.4 2021 ➤ Brake system - Edition 07.2021 – Remove mounting bracket. If mounting bracket is to be renewed: – Separate accelerator pedal module -GX2- from mounting bracket ⇒ Electric rear-wheel drive EIP220 and all-wheel drive EIA200, EIP220; Rep. gr. 93; Accelerator mechanism;...
  • Page 69 ID.4 2021 ➤ Brake system - Edition 07.2021 ♦ ⇒ Heating, air conditioning system; Rep. gr. 87; Air duct; As‐ sembly overview – air duct and air distribution in passenger compartment 5.5.2 Removing and installing mounting bracket, right-hand drive vehicles Removing –...
  • Page 70 ID.4 2021 ➤ Brake system - Edition 07.2021 – ⇒ Rep. gr. 46; Connect brake pedal to brake servo . Tightening torques ♦ ⇒ Rep. gr. 46; Assembly overview – brake pedal ♦ ⇒ Running gear, axles, steering; Rep. gr. 48; Steering col‐...

  • Page 71: Brakes - Hydraulics

    ID.4 2021 ➤ Brake system - Edition 07.2021 47 – Brakes - hydraulics Safety information and repair notes Safety information ⇒ Safety information and repair notes; Rep. gr. 00; Safety infor‐ mation Repair notes ⇒ Safety information and repair notes; Rep. gr. 00; Repair notes...

  • Page 72: Brake Servo And Brake Master Cylinder

    ID.4 2021 ➤ Brake system - Edition 07.2021 Brake servo and brake master cylin‐ Assembly overview – brake ser‐ vo/brake master cylinder 2.1.1 Assembly overview – brake servo/brake master cylinder, left-hand drive vehicles Rep. gr.47 - Brakes - hydraulics...
  • Page 73 ID.4 2021 ➤ Brake system - Edition 07.2021 1 - Brake line ❑ Brake master cylin‐ der/secondary piston circuit to hydraulic unit ❑ M12 × 1 ❑ mit Standardwerkzeug: 14 Nm ❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6:...
  • Page 74 ID.4 2021 ➤ Brake system - Edition 07.2021 ❑ 22 Nm 14 - Sealing plug 2.1.2 Assembly overview – brake servo/brake master cylinder, right-hand drive vehicles Rep. gr.47 - Brakes - hydraulics...
  • Page 75 ID.4 2021 ➤ Brake system - Edition 07.2021 1 - Cap 2 - Brake fluid reservoir 3 - Stud ❑ 4 Nm 4 - Brake servo -NX6- ❑ With brake servo con‐ trol unit -J539- ❑ With brake pedal posi‐...

  • Page 76: Removing And Installing Brake Servo

    ID.4 2021 ➤ Brake system - Edition 07.2021 14 - Sealing plug 15 - Brake fluid level warning contact -F34- Removing and installing brake servo 2.2.1 Removing and installing brake ser‐ vo [NX6], left-hand drive vehicles Special tools and workshop equipment required ♦...
  • Page 77 ID.4 2021 ➤ Brake system - Edition 07.2021 – Disconnect electrical connector -2- from brake fluid level warning contact -F34- and electrical connector -3- from brake servo -1- . NOTICE Risk of damage due to corrosion. – Make sure that no brake fluid gets onto electrical contacts.
  • Page 78 ID.4 2021 ➤ Brake system - Edition 07.2021 – Seal threaded holes in brake master cylinder immediately with M12 sealing plugs (assembly parts). – Seal brake lines with engine bung set -VAS 6122- . Note Fit dust caps from bleeder screws on brake lines as an alterna‐...
  • Page 79 ID.4 2021 ➤ Brake system - Edition 07.2021 – To do this, apply gentle heat from hot air blower -VAS 1978/14A- to adhesive residue and pull it off. – Thoroughly clean surfaces. Install in reverse order of removal, observing the following: –...
  • Page 80 ID.4 2021 ➤ Brake system - Edition 07.2021 Torque wrench -VAS 6854- Universal joint -V.A.G 1410/7- 11 mm open ring spanner insert -V.A.G 1410/6- ♦ ⇒ Rep. gr. 47; Assembly overview – brake servo/brake mas‐ ter cylinder ♦ ⇒ Electrical system; Rep. gr. 27; Battery; Assembly over‐...
  • Page 81 ID.4 2021 ➤ Brake system - Edition 07.2021 M12 sealing plugs Removing – If the brake servo control unit -J539- is renewed, carry out the test plan for the renewal of the brake servo control unit -J539- using ⇒ Vehicle diagnostic tester .
  • Page 82 ID.4 2021 ➤ Brake system - Edition 07.2021 – Pull brake fluid reservoir -1- upwards out of brake master cylinder. NOTICE Risk of damage due to corrosion. – Make sure that no brake fluid gets onto electrical contacts. – Place sufficient lint-free cleaning cloths in area of brake servo.
  • Page 83 ID.4 2021 ➤ Brake system - Edition 07.2021 – Carefully pull brake servo sideways to the left in direction of travel until the gasket tears. – Carefully pull brake servo off bulkhead. – Disconnect electrical connector -1- from brake servo -2- .
  • Page 84 ID.4 2021 ➤ Brake system - Edition 07.2021 Important • Keep brake lines straight when fitting them. – Tighten brake servo. – ⇒ Rep. gr. 47; Bleed hydraulic system following standard procedure . – If the brake servo control unit -J539- has been renewed, conclude the test plan for the renewal of the brake servo control unit -J539- using ⇒...

  • Page 85: Hydraulic System

    ID.4 2021 ➤ Brake system - Edition 07.2021 Hydraulic system General notes on brake fluid 3.1.1 General notes on brake fluid 3.1.2 Changing brake fluid ⇒ Maintenance; Booklet ; Brake and clutch system: Changing brake fluid Bleeding hydraulic system following...

  • Page 86: Testing For Leaks

    ID.4 2021 ➤ Brake system - Edition 07.2021 • Subsequent bleeding is carried out in connection with exces‐ sive brake pedal travel or so-called “spongy” brakes. • The aid of an additional mechanic is required for the subse‐ quent work steps.

  • Page 87: Checking Wheel Brake Cylinder For Leaks

    ID.4 2021 ➤ Brake system - Edition 07.2021 – Apply pressure to brake pedal until gauge indicates a pres‐ sure of 50 bar. Important • The pressure must not drop by more than 4 bar during the test period of 45 seconds. Renew brake master cylinder if drop in pressure exceeds specification.

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