[J]

I noticed my pads on both my front and rear Hayes Purple brakes are wearing very unevenly, not in comparison to each other. The breaking surface isn't parrellel to the metal backing. So on one part of the one pad there is ample pad left, and on the other side, its down to the metal. Seems as if the caliper halves are not parrellel. Catch my drift? What could be causing this?

-J

 

[Mustang85]

Buy Hopes

 

[D_D]

The caliper halfs not being parrellel to the disk
As to what is causing it you will have to find out. Could be anything from a crooked frame to the hub not being straight in the dropouts. If you have post mounts the caliper proberly just isn't bolted on straight.

 

[DLo]

Buy Hopes

My hopes are just as bad. Heck I even had one pad wear out once, and the other 3 were still in perfect condition.

J, what D said above me, but also, I'm guessin the rear could have gone bad when our deemaxes were havin play. I was wonderin if that was one of the causes of my funny wear in the back

 

[Repack]

The caliper was installed slightly out of alignment. If the caliper halfs were not parallel to each other, than they would not bolt together/seal properly. My hypothesis: The retainer spring is causing the pads to be in line with each other, thus they do not rub the rotor, but are in fact a fraction of a degree out of alignment with the caliper. When you apply the brakes, the pads are pressing parallel to the caliper, so they wear slightly out of alignment. Or something like that.
Either way, when it happens to me, by the time one side is to the metal, there is usually <2mm left on the other side: the pads are junk anyway.
The brake pads on my truch wear like the Hayes do, but to a slightly lesser degree.
You are talking about fractions of a degree during the install process that lead to this.

Don't worry about it.

 

[Enduro]

Do you run Hayes brake pads? I had EBC's for a while of which the springs had a different shape than the Hayes'. That caused the uneven padwear with me.

 

[J]

The pads arn't uneven from the caliper not being centered. The pads are worn uneven up and down (when looking at a rear brake with the caliper grabbing the top of the rotor). I think it might be because the little pin that clips into the pad has been bent back ever so slighty, from putting pads in, that it holds them like this V instead of this l l.

Diagram: The two slanted lines show the pads, and the straight up and down one shows the rotor when looking down into the front caliper when standing over your bike. IGNORE DOTS. Ah man this is stupid...

...................../ \
.........------>/..l..\ <------Pressure from squeezing brake
................./....l....\
.............../......l......\

Hope this comes out ok when I post...

-J

 

[DßR]

I get this a lot, my theory is that when you push the pads back with a screwdriver, say post-bleeding, you only push the bottom part of the piston/pad back, and it ends up cock-eyed in the piston bore, and from then on out it pushes the pad at the angle you see. It got really annoying for me b/c they end up so lop-sided that the rotor cuts the ends off the pad retension springs and the pads fall out.

To avoid this I've started using other uniformly flat things like cone wrenches and stuff to push the pads back and keep the pistons straight in their bores, but I haven't had enough time to see if it actually does anything. A caliper rebuild with fresh piston seals may be in order as well.

 

[Kntr]

My hayes mags on both my bikes do the exact same thing. My buddy complains of it too. It just a hayes thing.