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Old 09-20-10, 03:55 PM   #1
lamboluver
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Hydraulic Disc Brake Question

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.
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Old 09-20-10, 04:13 PM   #2
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also check wheel bearings and headset
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Old 09-20-10, 04:17 PM   #3
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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.
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Old 09-20-10, 04:18 PM   #4
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Quote:
Originally Posted by reptilezs View Post
also check wheel bearings and headset
Yes. And spokes. Disc brakes apply stresses to the wheel assembly and fork that rim brakes don't.
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