Mountain Bike Brake Piston Stuck. Plungers or pistons are metal, ceramic, or composite cylinders that are pushed and pulled by the fluid Disc brake lever setup. Brakes on your mountain bike are important and often taken for granted.
I read about some of you dealing with a corroded brake caliper piston that won't move with hydraulic pressure Remove the torch and wait for the caliper and piston to cool off before you touch them. Ive been having some issues with my rear brake for a while so i decided to take a look, i took out the pads and squeezed the lever- the piston (there is only one on this calliper) didnt move and a load of fluide bubbled out from behind. All modern mountain bike brake levers are.
The lower, outside piston is stuck.
I read about some of you dealing with a corroded brake caliper piston that won't move with hydraulic pressure Remove the torch and wait for the caliper and piston to cool off before you touch them.
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There are two types of brake fluid used in mountain bike brakes today. Before we start, let's define some terms. The simplest way to correct this problem is to clean the pistons with brake cleaner while the caliper is on the bike.