4

Just checking I am not going insane over this...

I have Shimano MT400's on my commuter. The rear one works brilliantly. The front one though is awful. There is no "bite", very little power and a dreadful piercing squeal at slow speeds.

So far I have:

  • Made sure that the rotor isn't warped and the alignment is right
  • Noticed that one pad was wearing more than the other. Put new pads in and pushed out both pistons to apply some brake fluid as a lubricant. Pushed the pistons back in obviously!
  • Carefully bedded in new pads.

Another thing I have noticed is that when I reset the pistons it is taking quite a few lever pulls to get the pads back to the disc - normally it only takes a couple.

I am thinking that there is something wrong with one of the pistons - but want to make sure that there isn't anything obvious before I go replacing it (I don't like just binning things off, would rather fix).

Cheers

Improve this question
1
  • 5
    Your symptoms indicate air in the line. Try doing a mini/top bleed first and then you can progress to a full bleed.
    – Warren Burton
    Feb 20 at 14:30

1 Answer 1

Reset to default
3

Your symptoms indicate air in the line. Try doing a mini/lever bleed first and then you can progress to a full bleed if you really need to.

You’ll need

  • A Shimano bleed cup.
  • Some mineral oil. It doesn’t need to be Shimano branded.
  • A 2.5mm hex wrench for the bleed port.
  • A 4mm hex for the brake lever.

You can do it at home in about 10-15 minutes. Take your time and be gentle with the small threads.

Improve this answer

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

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