Bicycle Mechanics - Hydraulic Disc Brake Question

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lamboluver
09-20-10, 03:55 PM
I recently got a bike with hydraulic disc brakes (Shimano M455 Calipers). I notice when I squeeze down the levers and move the bike back a forth the pads actually move inside the calipers. I normally would not think of this as a big deal but I think it might be causing a noise every time I hit the brakes. Is this normal with hydraulic disc brakes? And if not could this noise be coming from something else? It is usually a tapping/ clicking sound as soon as the pads make contact with the rotor.

Thanks for the help.

reptilezs
09-20-10, 04:13 PM
also check wheel bearings and headset
DMF
09-20-10, 04:17 PM
Disc brake pads are not fixed to the piston/caliper like 'armature' pads. When applied - squeezed against the rotor - the pads are pushed against a retainer/keeper that keeps them from sliding out from under the piston. Movement is normal. Such movement is not the cause of noise. A clicking sound could be interference or an irregularity in the rotor.

DMF
09-20-10, 04:18 PM
also check wheel bearings and headset

Yes. And spokes. Disc brakes apply stresses to the wheel assembly and fork that rim brakes don't.