A4 estate 1.9TDI SE 1998 rear brake discs issue!

[shaunlfc1]

I noticed yesterday the rear discs have a band of thick rust running around the entire braking surface where at least half the pad should be? The pads have what seems alot of meat on them, but I am a little confused on what could cause this on both sides of the car?

I wished I'd spotted this before I brought it I would of knocked him down a bit. Does it just need new pads and discs or are the calipers playing up?

Cheers again,

Shaun

[phil miller]

hi mate id fit new discs and pads as half the pad has been working on rust;) i would have thought if it was a caliper then the whole face would be rusty, it is fairly common for the disc face to go rusty and id say 80% of rear discs i replace at work is due to rust rather than worn below the min thickness, its because the back only does about 30% of the braking

[spartacus 68]

hi mate id fit new discs and pads as half the pad has been working on rust;) i would have thought if it was a caliper then the whole face would be rusty, it is fairly common for the disc face to go rusty and id say 80% of rear discs i replace at work is due to rust rather than worn below the min thickness, its because the back only does about 30% of the braking

Agree with fitting new discs and pads, however this also sounds like a sticky piston. Fairly common for rear calipers to seize. Audi do exchange service, or if you have the mechanical knowledge, do the brake rebuild yourself. May be possible to purchase brake kit from Audi and rebuild. Kit comes with dust sleeve, 'o' ring, etc. Get yourself some Lockheed red grease (specially formulated for hydraulic applications) and apply to the caliper bore before inserting the piston, and under the dust sleeve. Ensure slide bolts are lubricated and move freely. Just fitted Febi discs and Bosch pads. Incidentally you'll need a universal brake wind back tool from Draper to do this job.;)

[yaman]

I am a little confused on what could cause this on both sides of the car?
Cheers again,
Shaun


Its normally caused by the car sitting around, unused, for a few months.

Regards
Jim

[shaunlfc1]

I've spoken to GSF and other motor factors and they've all said there are 4 different types of rear pads for this car, and they cannot tell me which one I need from the car reg. It seems the only way is to take them off the car first and take them with me to GSF. Is there a way of knowing which pads I have for my car to save the hassle of taking them off and having to borrow another car to go and get the correct pads?

Are there any special tools I need to replace the rear discs and pads?

Thanks all for your advice its been invaluable.

Cheers,

Shaun

[yaman]

Take a pad out, trace it out on a piece of paper,
take a photo of the pad with your fone, take down
make of caliper (if visible). Replace pad.

With all this information, the man at GSF should be
able to figure it out.

You will need a wind-back tool, GSF should have them.

Regards
Jim