Tools and Preparation
For this task, you will need:
- Ratchet
- Extension
- 8mm socket
- Vacuum brake bleeder (recommended model: Four Uncles, available on Amazon)
- DOT 4 brake fluid (ensure it’s compatible with your bike’s specifications)
Step-by-Step Brake Fluid Change
1. Access the Reservoir: Begin by removing the 8mm bolt securing the brake fluid reservoir behind the frame. Slide the reservoir out carefully.
2. Inspect the Fluid: Open the reservoir cap and check the condition of the brake fluid. If it appears brownish, it’s time to replace it. Remember, brake fluid should typically be changed every 18 months in the Northeast or annually in regions with high humidity.
3. Drain the Old Fluid: Attach the vacuum bleeder to the reservoir and start draining some of the old fluid, ensuring you don’t completely empty it to avoid introducing air into the system.
4. Prepare the Caliper: Move to the rear brake caliper, remove the nipple cap by hand, and fit the vacuum bleeder over the nipple.
5. Pump and Drain: Using an 8mm wrench, loosen the bleeder screw about half a turn. Pump the rear brake pedal to build pressure, hold it down, and then open the bleeder screw. The pedal will depress, allowing old fluid to drain out. Monitor the reservoir to ensure it doesn’t empty completely.
6. Refill and Repeat: Refill the reservoir with fresh DOT 4 brake fluid, then repeat the pump, hold, and drain process about five or six times until the fluid in the vacuum line is clear and free of air bubbles.
7. Finish Up: Once the fluid is clear, secure the reservoir cap and grommet. Reattach the reservoir to its original position behind the frame and ensure everything is properly aligned and secured.
8. Clean Up: Wipe off any spilled brake fluid as it’s corrosive. Replace the nipple cap and ensure no air or moisture can enter the system.
By following these steps, you can effectively fix a squishy brake pedal and ensure your bike’s braking system is functioning optimally. Regular brake maintenance is crucial for safety and performance, so be sure to adhere to the recommended service intervals.
For a visual guide, watch Eddie Maximillian’s full video tutorial on YouTube.