Uneven brake wear (see pic)

magnethead

Hi Guys,
My rear brake disks are a little weird, this one in the picture is worse than the other one, but both, have a rusty patch that is definately under the area of the disk...I put some red lines on the picture to show the area that should be smooth!! If you rub your finger across this area now, there are hills and valleys!

Any advice would be welcome

biko

Yeah, looks like you need resurfacing those rotors/discs or get new ones.
If you pull pads off they should have grooves in them which isn't good for braking effort.
How is braking now?

magnethead

Front pads are excellent and have good even wear...these are just the rear and pads and I can't personnally feel anything/ notice anything wrong with the breaking effort..

One of the lads here in work mentioned something about break pad 'glazing'...said I should take the pads off and run a file over them?? Does that sound right or is a one disk the way forward?

jimgoose

magnethead wrote: »

Front pads are excellent and have good even wear...these are just the rear and pads and I can't personnally feel anything/ notice anything wrong with the breaking effort..

One of the lads here in work mentioned something about break pad 'glazing'...said I should take the pads off and run a file over them?? Does that sound right or is a one disk the way forward?

Glazing is a different thing. Those rotors of yours were scored at some point, probably by a set of pads that were too worn. You'll need to resurface or remove both of the rear discs. I generally address glazing issues through <ahem> Spirited Application... :cool:

magnethead

Fairplay to you, I'd say new disks on this Corolla would be as expensive as having someone mill a new surface. Wouldn't you think?

For curiousity sake....Whey doesn't the Harder brake pad just wear down to an even surface again, if the previous pad (which was taken off too late) created some groves in the disk

Thanks again

jimgoose

magnethead wrote: »

Fairplay to you, I'd say new disks on this Corolla would be as expensive as having someone mill a new surface. Wouldn't you think?

For curiousity sake....Whey doesn't the Harder brake pad just wear down to an even surface again, if the previous pad (which was taken off too late) created some groves in the disk

Thanks again

It is the steel backing-plate (and possibly rivet heads) of the old worn pads that would have scored the disc, after all the actual abrasive material had worn away. The best new pads can do subsequently is "adopt" the ridged shape of the scores, thus losing substantial braking power. A pair of discs for it would probably be around €200 fitted.

magnethead

Thanks again for your help on these, New Brake discs it is then

CJhaughey

Check the caliper sliders and brake pins as well, they look fairly rusty and when they wear they sometimes don't allow the pad/caliper to slide properly.

magnethead

Check the caliper sliders and brake pins as well, they look fairly rusty and when they wear they sometimes don't allow the pad/caliper to slide properly.

Thanks, just getting around to servicing the brakes now, Both the caliper had stuck pins, sure check it out....Had to remove them with a hammer and screwdriver and then put them on a grinder and roll them clean watching not to remove my fingernails at the time


Anyway, I was waayy to afriad of this job, but it turned out to be VERY staight forward...putting on a new disk was easy....and now I understand that when replacing new pads, you don't just stick new pads in and walk away, It's even more important to service your caliper! I got new boots for them, and used Red Rubber grease (hi-temp stuff) for the slide pins....

Happy bunny now

corglass

That alloy, on the ground. .. ahhhhhhhhhh