How to Bleed Disc Brakes on Your Mountain Bike: A Complete Guide
To bleed disc brakes on a mountain bike, first remove the wheel and caliper from the bike. Squeeze the brake lever to remove any remaining fluid from the hose. Attach the bleed block and syringe to the caliper and fill the syringe with brake fluid. Open the bleed valve and slowly inject the fluid into the caliper until all air bubbles have been removed and fluid flows steadily. Close the valve and repeat the process on the lever, making sure to keep the reservoir full throughout. Once complete, replace the wheel and test the brakes.