Section 4 Vacuum Booster With Brake Master Cylinder Assembly - Geely CK Series 2007 Workshop Manual

Section 4 Vacuum Booster with Brake Master Cylinder Assembly

Notice: The vacuum booster with brake master cylinder assembly must be repaired by
manufacturer. Replace it if it is faulty.
On-vehicle inspection
1. Check vacuum booster
(a) Air tightness check
(1) start the engine, run 1 or 2 minutes then shut off. Depress the brake pedal several times slightly.
Hint: if the pedal rises gradually after depressing the pedal, the booster is airtight.
(2) Depress the brake pedal while the engine is running, and stop the engine with the pedal depressed.
Hint: if there is no change in the pedal reserve stroke after holding the pedal for 30 seconds,
the booster is air--tight.
Good
Third
Second
First
(b) Operating check
Depress the brake pedal and start the engine. If the pedal goes down slightly, operation is normal.
2. Check the vacuum check valve
(1) Remove the connecting pipe with the check valve
(2) Check the direction from the booster to the engine. Check valve for ventilation. It should not
ventilate in the reverse order.
(3) Replace it if it is faulty.
Notice: Pay attention to the matchmark on the connecting hose when connecting
the hose with vacuum check valve. Do not install it in reverse order.
Replacement
1. Remove the brake pipe on the brake master cylinder (master cylinder)
2. Refer to Brake Pedal Replacement for other operation
Notice:
(1) The torque of the union thread on the brake master cylinder (master cylinder )
and brake pipe: 12-16 N.m
(2) Bleed all the air in the brake system after installation
Poor
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