SRAM Guide RS Service Manual
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SRAM Guide RS Service Manual

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2017 Guide RS & R
s e r v i c e
m a n u a l
GEN.0000000005240 Rev A
© 2017 SRAM, LLC

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Summary of Contents for SRAM Guide RS

  • Page 1 2017 Guide RS & R s e r v i c e m a n u a l GEN.0000000005240 Rev A © 2017 SRAM, LLC...
  • Page 2 LIMITATIONS OF LIABILITY To the extent allowed by local law, except for the obligations specifically set forth in this warranty statement, in no event shall SRAM or its third party suppliers be liable for direct, indirect, special, incidental, or consequential damages.

  • Page 3: Table Of Contents

    CALIPER PISTON REMOVAL ............................................9 CALIPER PISTON INSTALLATION ..........................................12 LEVER SERVICE .........................................15 PARTS AND TOOLS NEEDED FOR SERVICE......................................15 GUIDE RS LEVER EXPLODED VIEW ......................................... 15 GUIDE R LEVER EXPLODED VIEW ........................................... 16 LEVER BLADE REMOVAL............................................. 17 PISTON ASSEMBLY REMOVAL ..........................................20 PISTON ASSEMBLY INSTALLATION ........................................
  • Page 4 SAFETY FIRST! We care about YOU. Please, always wear your safety glasses and protective gloves when servicing SRAM® products. Protect yourself! Wear your safety gear!

  • Page 5: Brake Service Overview

    • Do not allow any brake fluid to come in contact with the brake pads. If this occurs, the pads are contaminated and must be replaced. • For best results, use only SRAM High-Performance DOT 5.1 brake fluid. If SRAM brake fluid is not available, only use DOT 5.1 or 4 brake fluid.

  • Page 6: Troubleshooting

    T r o u b l e s h o o t i n g 'Sticky' or slow brake pad return and/or excessive lever throw If your brakes feel sticky and exhibit slow brake pad return and/or excessive brake lever throw, it may be a result of the pistons sticking in the caliper. Before completely disassembling your caliper, you can try to loosen the sticky piston by performing the following steps: Clamp the bicycle into a bicycle work stand.

  • Page 7: Caliper Service

    C a l i p e r S e r v i c e We recommend that you have your SRAM® Guide™ Brakes serviced by a qualified bicycle mechanic. Servicing SRAM brakes requires knowledge of brake components as well as the special tools and fluids used for service.

  • Page 8: Caliper Brake Pad Removal

    C a l i p e r B r a k e P a d R e m o v a l NOTI CE Brake pads must be replaced if the total thickness of the backing plate and pad friction material is less than 3 mm. ®...

  • Page 9: Caliper Piston Removal

    C a l i p e r P i s t o n R e m o v a l N OTIC E DOT fluid will damage painted surfaces. If any fluid comes in contact with a painted surface (e.g your frame) or printing on the brakes, wipe it off immediately and clean it with isopropyl alcohol or water.
  • Page 10 Remove the Guide™ pad spreader. 2.5 mm hex wrench Remove the pad retention bolt. Remove each caliper body bolt. T25 TORX wrench Separate the caliper body halves. Set the heat shield aside. Remove the caliper o-ring from the outboard side of the caliper. Caliper Piston Removal...
  • Page 11 Remove the pistons from each caliper body half. Remove the piston seals from each caliper body half. Install new seals inside each caliper body half. ⚠ WA RNI NG Do not scratch the seal gland with the pick. Scratches could cause fluid to leak when the brake is applied, which will contaminate the brake pads and could lead to a brake failure.

  • Page 12: Caliper Piston Installation

    NOTI CE For the best braking performance, use only SRAM High-Performance DOT 5.1 fluid. If SRAM fluid is not available, use only DOT 5.1 or 4 fluid. Do not use grease. Grease will prevent the pistons from fully retracting into the caliper bores which will reduce braking performance.
  • Page 13 T25 TORX bit 9.5 - 11.8 N·m (87 - 104 in-lb) Remove the o-rings from the banjo bolt and banjo fitting. Apply a small amount of SRAM High-Performance DOT 5.1 fluid to the new o-rings and install them. Caliper Piston Installation...
  • Page 14 Hold the banjo at the desired angle. Tighten the banjo bolt to 4.4-5.4 N·m (39-48 in-lb). T25 TORX bit 4.4-5.4 N·m (39-48 in-lb) Insert the Guide™ bleed block into the caliper. Guide Bleed block Install the pad retention bolt. ⚠ WA RNI NG You must bleed your brakes before reinstalling the brake pads.

  • Page 15: Lever Service

    • SRAM® High-Performance DOT 5.1 fluid. If SRAM fluid is not available, only use DOT 5.1 or 4 fluid. • SRAM or AVID DOT grease. If SRAM or AVID DOT grease is not available only use a DOT compatible grease.

  • Page 16: Guide R Lever Exploded View

    G u i d e R L e v e r E x p l o d e d V i e w Reservoir bolt Reservoir cap Piston assembly Push rod Bladder Snap ring Binder plug Washer Lever return spring Pinch bolt Hose boot Compression nut...

  • Page 17: Lever Blade Removal

    Install all new seals and a new hose. For best braking performance, use only SRAM® High-Performance DOT 5.1 fluid. If SRAM fluid is not available, use only High-Performance DOT 5.1 fluid or 4 fluid. Lever Blade Removal...
  • Page 18 Remove the reservoir cap bolts from the reservoir cap. T10 TORX wrench Remove the reservoir cover and bladder from the lever body. Pour the fluid from the brake lever body into a pan. Separate the bladder from the reservoir cover. Spray isopropyl alcohol on the bladder and the reservoir cover, then clean them with a rag.
  • Page 19 Remove the binder plug. Pick Remove the pinch bolt. T8 TORX wrench Use the T8 TORX wrench to push out the pivot pin. T8 TORX wrench Remove the lever blade from the lever body. The R lever blade has four pieces, the lever blade, the cam/push rod assembly, a washer, and the lever return spring.

  • Page 20: Piston Assembly Removal

    P i s t o n A s s e m b l y R e m o v a l Use a pick to remove the lever blade bushings from both sides of the lever. RS only: Use a T8 TORX® wrench to remove the SwingLink™ pivot pinch bolt.
  • Page 21 Use long-tipped internal snap ring pliers to apply downward pressure to the lever body and remove the snap ring. Turn the lever body upside down to allow the washer to fall out of the body. Internal snap ring pliers 20 mm or 15 mm Thru Axle Use needle nose pliers to remove the piston assembly.

  • Page 22: Piston Assembly Installation

    Damage to painted and/or printed surfaces by DOT fluid is not covered under warranty. Submerge a new piston assembly in SRAM® High-Performance DOT 5.1 fluid. You can also use SRAM DOT Assembly Grease, or DOT 5.1 or 4 compatible grease, as a lubricant. SRAM High Performance DOT 5.1 fluid Install the new piston assembly into the lever body.

  • Page 23: Rs Lever Blade Installation

    R S L e v e r B l a d e I n s t a l l a t i o n Use needle nose pliers to install the SwingLink™ bushings. If the SwingLink bushings fall out easily, apply a small amount of DOT grease to the bushings to help hold them in place.
  • Page 24 Apply a small amount of 242® Blue Loctite® onto the threads of the T8 TORX wrench SwingLink™ pivot pinch bolt. Use a T8 TORX® wrench to thread the SwingLink pivot pinch bolt into the SwingLink. 242 Blue Loctite 20 mm or 15 mm Thru Axle Insert the lever blade assembly into the lever body, place the lever return spring on the lever body.
  • Page 25 Apply a small amount of 242® Blue Loctite® onto the pinch bolt. T8 TORX wrench 242 Blue Loctite 20 mm or 15 mm Thru Axle Use a T8 TORX® wrench to thread the pinch bolt into the lever body. Use a torque wrench and a T8 TORX bit socket to tighten the bolt to 2.7-3.2 N·m (24-28 in-lb).
  • Page 26 Spray isopropyl alcohol on the lever body and clean it with a rag. 8 mm flare nut crowfoot 8 N·m (71 in-lb) N OTIC E You must bleed the brakes to complete the service. For brake bleed, brake hose shortening, and brake pad replacement instructions, visit www.sram.com/service. RS Lever Blade Installation...

  • Page 27: R Lever Blade Installation

    Steps to reassemble the R lever blade assembly: Place the washer on the cam/push rod assembly. You may add a dab of SRAM® DOT grease to hold the washer in place. Install the lever return spring onto the cam/push rod assembly.
  • Page 28 Insert the lever blade assembly into the lever body, placing the push rod into the piston and lever return spring on the lever body. Make sure the lever return spring is seated properly in the lever. The outboard end of the spring must press against the lever blade, while the inboard end of the spring must press against the lever body.
  • Page 29 Use a torque wrench and a T8 TORX wrench to tighten the bolt to 2.7-3.2 N·m (24-28 in-lb). T8 TORX 2.7-3.2 N•m (24-28 in-lb) 22 m Use a T8 TORX wrench to install a new binder bolt plug. T8 TORX wrench Press the bladder into the reservoir cap so that the bladder is properly seated and flush with the reservoir cap.
  • Page 30 Spray isopropyl alcohol on the lever body and clean it with a rag. 8 mm flare nut crowfoot 8 N·m (71 in-lb) N OTIC E You must bleed the brakes to complete the service. For brake bleed, brake hose shortening, and brake pad replacement instructions, visit www.sram.com/service. R Lever Blade Installation...
  • Page 31 This publication includes trademarks and registered trademarks of the following companies: TORX® is a registered trademark of Acument Intellectual Properties, LLC. Loctite® and 242® are registered trademarks of Henkel Corporation...
  • Page 32 ASIAN HEADQUARTERS WORLD HEADQUARTERS EUROPEAN HEADQUARTERS SRAM Taiwan SRAM LLC SRAM Europe No. 1598-8 Chung Shan Road 1000 W. Fulton Market, 4th Floor Paasbosweg 14-16 Shen Kang Hsiang, Taichung City Chicago, Illinois 60607 3862ZS Nijkerk Taiwan R.O.C. The Netherlands...

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