I have a brand new Trek Marlin 5 (1-2 months old) with hydraulic disc brakes and the rear brake doesn’t work well and when I pull the brake lever, it clicks once somewhere in the frame (cables inner routed).

  • 4
    You should take this back to the shop you bought it from; that's way too soon for anything to be wearing out.
    – DavidW
    Commented Jul 12, 2020 at 18:00

2 Answers 2


First, don't ride the bike if one of the brakes is not working properly. Not working well can change to not working at all and put you in a dangerous situation.

Take the bike back to the store where you bought it, a 2 month old bike with a major brake problem should be fixed under warranty. In any case if you do not have experience diagnosing and repairing hydraulic brakes you should have a professional address this problem.

The problem is likely that the rear brake has lost hydraulic fluid, or perhaps a seal has broken in the lever or caliper.


Clicking on hydraulic brakes with inner routing can be just cable hitting a frame when moving under increased tension. What is exact problem with braking? - do you need to apply extra force to brake or you feel like rotor is still spinning even under max pressure?

  • Unlike with cables, I can't feel any of my brake hoses move under increased hydraulic pressure. So for properly installed hoses, I don't think the hose could "just" be hitting the frame. Commented Jul 14, 2020 at 9:21

Your Answer

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

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