How to Tighten Rear Disc Brakes on a Mountain Bike: Quick and Easy Steps
To tighten rear disc brakes on a mountain bike, start by squeezing the brake lever to see how much movement the brakes have. If they move too far, locate the brake cable adjuster where the cable exits the brake lever and turn it clockwise to tighten the cable. If the brakes still require further tightening, locate the barrel adjuster on the brake caliper and turn it clockwise to bring the brake pads closer to the rotor. Test the brakes again and continue making adjustments until they feel tight and responsive.