Brake problem

Stonewolf

Hi guys,
I have a Discovery 3. Last year I had my brake pads replaced, this week one of my wheels has started making a grinding noise under braking. Closer inspection shows that the brake pad is very badly degraded and the wear on the disc is rough indicating possible wearthrough. Confusingly the other wheels are fine, I can still see the distinctive green frame of the pad and the white writing on its back face. I had originally thought that perhaps the guy who did the work missed one but with the brightness of my camera flash I can just about make out the writing on the back face of the corroded pad. Obviously this is a serious problem and needs to be fixed asap but I wanted to know if you guys know of anything that might cause one wheel to suffer this kind of wear (and corrosion) and not the others?

(note, the disc is old, I have replacement discs waiting to be fitted)
https://plus.google.com/104735048571100974224/posts/2cDdgXwg8ue

Mech1

Jack up that wheel and check for wheel bearing play.

If too much play then the disc moves and rubs on the pad mounting shims.

Mech1

On looking at your pictures, I see one side (the scraped disc side) has been overheating.

Try to source Textar pads as they come with all the ness mounting kit.

Your old pads look like they didnt get the mounting kit when fitted causing the pads to sieze in the caliper slots.

Stonewolf

I had the anti roll bar bushings replaced in January due to NCT failure. The pads were replaced in September, might the bad bushings have given the wheel enough play to cause the damage then and the pad's only wearing through now?

Mech1

No, anti roll bushings have nothing to do with it.

enumbers

it looks like that disc has been over heated so be sure there is no sticking on the brakes on that side

Stonewolf

Mech1 wrote: »

On looking at your pictures, I see one side (the scraped disc side) has been overheating.

Try to source Textar pads as they come with all the ness mounting kit.

Your old pads look like they didnt get the mounting kit when fitted causing the pads to sieze in the caliper slots.

The scraped one is on the "front" of the wheel with the problem, the pic with the still green pad is the "front" of the opposite wheel, I didn't think to photograph the rear side of the disc.

For reference the pads are EBC, the discs are probably the originals that were fitted out of the factory 180k km ago (I've only had it for about 20k).

Tropheus

I've a similar problem on the rear brakes of my Allroad. Normally I'll replace 2-3 sets of fronts for one set of rears. However, recently I started getting a grinding noise and noticed that the rear pads were down to the metal on both sides. The disks were also badly scored. As a stopgap, I stuck on a new set of pads and am getting by.

On reading up on it seems to be a sticky calliper piston. i.e. the piston isn't moving freely so isn't retracting and thus the pads and in continuous contact with the disk. Eventually the pad wears down to the medal and you end up with a knackered disk.

The solution is to rebuild the callipers with new pistons and seals and obviously replace the disks and pads. I got the pistons and seals from this guy on eBay - http://www.ebay.ie/usr/biggred4u?_trksid=p2047675.l2559.

Going to tackle the job tomorrow.