Sticky Shimano brake pistons and lever
jbolvig
Posts: 2
So yesterday I ran into a problem with my Shimano MT500 rear brake on my Calibre Bossnut Evo. The bike had been stationary for about five weeks due to a minor injury. I pressed rear brake the lever and the pistons pushed the pads against the rotor but after releasing the lever the pistons didn’t retract and caused the pads to lock around the rotor. The lever also didn’t spring back to its normal position and remains very close to the bars.
I’ve pulled the brake caliper off and removed the pads. It seems like the pistons are stuck. I’ve tried cleaning the pistons for dirt and grime but still, the pistons refuse to retract into the caliper. Also, the pistons don’t move independently of each other and if I press one of them back into the caliper the other one is pressed further out of the caliper. I haven’t bled the brakes, so I don’t believe that the system is overfilled.
Do you guys have any idea of what the cause of the problem might be and how I can fix it?
Thanks in advance!
I’ve pulled the brake caliper off and removed the pads. It seems like the pistons are stuck. I’ve tried cleaning the pistons for dirt and grime but still, the pistons refuse to retract into the caliper. Also, the pistons don’t move independently of each other and if I press one of them back into the caliper the other one is pressed further out of the caliper. I haven’t bled the brakes, so I don’t believe that the system is overfilled.
Do you guys have any idea of what the cause of the problem might be and how I can fix it?
Thanks in advance!
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