If your SRAM Guide brakes feel spongy, the lever pulls to the bar, or it’s been over a year since your last bleed, it’s time to refresh the brake fluid and bleed the system. This guide provides a detailed, step-by-step process on how to bleed SRAM Guide brakes, effectively removing air and restoring optimal performance.
For hydraulic disc brakes utilizing DOT fluid, annual bleeding is crucial for consistent braking power and feel. This ensures the fluid remains free of moisture and contaminants, preventing corrosion and maintaining optimal performance. Let’s dive into how to bleed SRAM Guide brakes properly.
Skill Level
Intermediate
Essential Tools and Materials:
- SRAM/Avid bleed kit (Bleed Kit)
- DOT 5.1 Brake Fluid
- Gloves
- Protective Glasses
- Zip Ties or Straps
Step-by-Step Bleeding Process:
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Preparation is Key:
- Remove the wheel(s) from your bike.
- Prepare the syringes. Fill one syringe about half full and the other about one-third full with fresh DOT 5.1 brake fluid.
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Remove Air from Syringes:
- Close off the syringes at the top.
- Pull the syringe plunger to create a vacuum. This will draw out any trapped air bubbles in the fluid. Repeat until no more air bubbles are released.
- Orient the syringe upwards and push any accumulated air out.
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Prepare the Brake Lever:
- Locate the bite point adjuster on your brake lever. Turn it away from the arrow, setting it to the maximum position.
- Orient the brake lever downwards. Secure it to the handlebar using a zip tie or strap. This will hold the lever in a consistent position throughout the bleeding process.
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Prepare the Brake Caliper:
- If you have new brake pads, insert the transport guard into the caliper. If your brake pads are worn or used, remove them and install a bleed block. This will prevent the pistons from extending too far during the bleed.
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Connect the Syringes:
- Locate the bleed screws on the brake caliper. Remove the lower screw.
- Attach the half-filled syringe to the lower bleed port.
- Remove the upper bleed screw on the brake lever. Attach the other syringe to this port.
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Bleeding the System:
- Gently push approximately 5-10 ml of brake fluid from the lower syringe up into the system, towards the lever. Ensure the syringe is completely free of air.
- Observe the upper syringe. You should see air bubbles and old fluid entering the syringe.
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Bleeding the Caliper:
- Carefully create a slight vacuum in the lower syringe by pulling on the plunger. This will draw air bubbles out of the caliper.
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Bleeding the Lever:
- Release the strap holding the brake lever and slowly allow it to return to its normal position.
- Simultaneously, build up pressure on the lower syringe.
- Close the upper syringe.
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Finalizing the Bleed:
- Remove the lower syringe and re-install the bleed screw.
- Create a slight vacuum on the upper syringe to bleed the lever.
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Final Steps:
- Remove the upper syringe and re-attach the bleed screw.
- Clean the brake lever and caliper with clean water to remove any spilled brake fluid. DOT fluid can damage paint and other finishes.
- Return the brake lever to its original position.
- If you removed the brake pads, reinstall them.
- Reinstall the wheel.
Troubleshooting Tips:
- Persistent Sponginess: If the brakes still feel spongy after bleeding, repeat the process. Ensure you are thoroughly removing all air bubbles from both the syringes and the brake system.
- Leaking Fluid: If you notice any leaks, double-check the bleed screw tightness and ensure the bleed fittings are properly seated.
- Contaminated Fluid: If the fluid appears discolored or contains debris, flush the entire system with fresh fluid.
By following these steps, you can effectively bleed SRAM Guide brakes and restore optimal braking performance. Regular maintenance, including annual bleeding, will ensure your brakes remain reliable and responsive, enhancing your riding experience and safety.
