Hi everyone, I've got a problem with my rear brake. Problem is it's catching quite badly, seems to work fine but doesn't have much locking power. I'm unsure if the disc is bent or the wheel is out of true? I wouldn't have thought the caliper was seized due to the fact the brake actually works. Would it be more likely the wheel or disc at fault? Can you true trial wheels like a push bike wheel? Thanks in advance

Edited November 12, 201510 yr by neilboxer

The wheel being out of true would not affect the operation of a disc brake.

Careless truing of a drum braked wheel could cause distortion of the drum and yes you do true the wheel like a bicycle one.

The disc has nowt to do with wheel run out. Take pads out. Then you'll see if disc is bent. It can be straightened.

Any judder when you brake, that would show a bent disc

Right the pads are out and the disc is like a dogs back leg How do I go about straightening it? Fronts a little bent too, but the wheel spins quite freely

Just buy a nice new one. They never straighten quite right. 

 

If you insist on straightening it then get an adjustable spanner. Adjust it to the thickness of the disc and give it a tweak. The bigger spanner the better so as to spread the force along the disc.

A push iron brake but you get the idea.

You are probably out of pad. Start with new pads. Happens all the time!

Thanks for the help lads, pads are low and the disc is defiantly bent. I've got it 90% straight and it barely catches now so I'm happy