3

I'm trying to replace my brake pads but when I try to push one piston in, the other one will come out and when I push it back in the previous one will do the same... how do I fix this so that both pistons remain retracted?

0
3

You need to push both pistons at the same time. There are tools for doing this, but many of us use a large flat bladed screwdriver.

You need a steady firm pressure for a few seconds to force the fuild in the lever back into the reservoir. Have a look at this Park Tool video - about 4:10

2

It turns out there's a lot of air in the brake system, it stopped when I open the lever cap and pull the lever for a few times.

1
  • The hint with the lever cap worked for me. I had the very same issue with two pistons caliper Shimano BR-MT200, One pushed, the other comes out. The trick for me was to open the lever cap and then push one of the pistons and the other - they are pushed inside the caliper successfully in that way I lost around 10-15 drops of break fluid (it was too much). Few months ago, I went to a bike service to purge the air from the read brake and filled it to the top. This caused the issue, i had too much break fluid. – mihkov May 15 at 14:54

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.