My bicycle's mechanical disk brakes are failing!

My rear disk brake is in a sad state.  I squeeze the rear brake lever as hard as I can, yet, my stopping power is nil.  I wiped down the rotor with rubbing alcohol, but to no avail.

It might also be relevant that I ride frequently in snow and slush, and also in dusty areas.

The bike is the Specialized ''Rockhopper," 2009 edition, with about 450-550 miles put on it.

What can I do to fix  the brake so that I won't have to rely on the front brake?

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kelseymh6 years ago
Have you been maintaining them properly? Are the pads of sufficient thickness, and adjusted correctly? Are these strictly mechanical, or is there a hydraulic system? The latter may need to be bled.
tincanz (author)  kelseymh6 years ago
Thanks for the site, and yes, I have been maintaining them well.

The brakes are strictly mechanical, no hydraulics.

I don't know how to check the pads, or to adjust them...
tincanz (author)  FriendOfHumanity6 years ago
great site...

thank you very much
airsofter16 years ago
My guess is that they are just not adjusted correctly. If you don't know how to adjust them then take it to a bike mechanic. If you can determine that they don't need to be adjusted, you should still take it a bike mechanic to solve the problem.
neffk6 years ago
Check your cables to make sure they're not seizing.
tincanz (author)  neffk6 years ago
they definitely aren't.

the cables move and the pads clamp slightly, just not enough.