Mountain Bike Brake Piston Stuck

The calipers are the part of the bike that actually squeeze the brake pads to the tire on rim brakes.

Mountain bike brake piston stuck. Still holding lever lubricate the retracting bit of the piston with a bit of brake fluid dot 4 or 5 1 not oil as this may damage the seals and or might work through the seals and mix with the brake fluid. We talk a bit about how the brake functions and walk through the cleaning procedure to help your brakes in. Squeeze the lever the non retracting piston should be fully out. Tech talks presented by park tool is a monthly video series hosted by park tool s own wrench whisperer calvin jones.

Unscrew the brake pads located on the inside of the brake calipers above your tires. Disc brake piston press brake cleaner rag. While holding the lever wipe around the piston with a clean lint free cloth. 7 ways you re destroying your mountain bike mtb maintenance tips duration.

If you are going to change or upgrade your mountain bike brake pads the easiest way to reset your pistons is without removing the worn brake pads. Sometimes the pads in hydraulic disc brakes can rub because the pistons get pushed out too far especially if the lever is applied without a rotor or spacer between the pads. The series covers the a to zs of some of the most prevalent repair jobs with. The brake pad is the small piece of rubber on the lower inside of the caliper that actually comes into contact with the wheel.

Feb 18 2011 at 8 30 quote. Avid hydraulic disc brake stuck on cycle tech uk. Prevent sticky pistons by cleaning and lubing the pistons every time you change pads. Then take a q tip and soak it with dot 5 1 fluid.

Using the saturated q tip apply brake fluid to the pistons themselves then reset the pistons using a 9mm box end wrench. I ve seen this thing happen on a lot of brakes i ve even had a persistent elixir cr with this problem at the shop i used to. Remove the wheel and just put a large flat blade screwdriver between the pads and twist pushing the pads apart until the calliper pistons are retracted to its original position. Good solution is to remove the pads and press the pistons out a little bit by pulling the levers 1 3 times.