uneven pad wear

[924racer]

Hi all, i've noticed a problem with the way my new brake pads wear. They appear to be wearing unevenly front to back of the pad and differently on each side of the disk, alsmot as though the caliper is twisting. The calipers are single piston floating, which we're not allowed to change and i fear may be reason why this is happening. I was wondering if there is anyway of curing this problem or am i stuck with it unless different calipers are used?

matt

[Trooper2]

It sounds like the floating caliper pins are not allowing the calipers to float and need to be lubed with high temp grease.

[924racer]

thanks, will do that for next time.

[steve_d]

Am I understanding your description correctly.
Are you saying for instance that the leading edge of the outboard pad is thin and leading edge of the inboard pad is thick. Your instance may be the other way round but you get what I'm saying.
If so then it sounds like the caliper slide pin is not square to the disc. You will need to use an engineers square to confirm. It may be possible to shim or machine the caliper mount to correct this.

Steve

[924racer]

steve_d said:

Am I understanding your description correctly.
Are you saying for instance that the leading edge of the outboard pad is thin and leading edge of the inboard pad is thick. Your instance may be the other way round but you get what I'm saying.
If so then it sounds like the caliper slide pin is not square to the disc. You will need to use an engineers square to confirm. It may be possible to shim or machine the caliper mount to correct this.

Steve

yes that's whats happening to the pads (my description wasn't the greatest). Thanks for the advice, i will be taking them apart soon so i'll have a look at that as well.

[thegoose]

I don't have experience of your brakes, but on my car I "wedge" pads a bit and also get uneven wear between inside & outside pads. The wedging can come from the caliper piston rotating within the caliper and therefore not applying pressure in the right spot/s. The difference in wear inside to outside is due to the difference in cooling (or lack of) side to side. I get quite a lot of pick up on the discs (melted pad material) so I guess the wedging could also be down to one pad being hotter than the other, therefore less hard, therefore the disc is pushed over slightly by the other, more effective, pad.

I had new discs & Pagid black pads and after a test day Friday (4 1/2 hour sessions) and qualifying & one race yesterday they were shot (half worn & starting to crumble round the edges where the pad material meets the backing plate) and had to be replaced for the second race. I got class wins in both though

[motorwise]

sounds like a siezed guide pin - what car are we talking about here?