2004 Audi A4 1.8T, I have black dust on the rear wheels constantly.
Good evening. I recently purchased an 04 audi A4 and it has 18000 miles. After driving it for a few days I saw that black dust is building on the rear wheels.I wash them but in 2 - 3 days is back and is not from the road. I checked the brake pads and they are ok. Maybe at the owner before me put a wrong type of brake pad, or is it something else? Also I am missing the book that has the service intervals, anybody know a web page where I can get it? Thank you
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Re: 2004 Audi A4 1.8T, I have black dust on the rear...
The black coating is definitely brake pad dust, and there are a number of commercially available wheel sealants / treatments that will help minimize the dust accumulation by coating/sealing the wheel surface, some with a Teflon-like additive. Check them out online or at your local auto supply
This usually becomes a problem when the original seal coating on the rim is scrubbed off or deteriorates, leaving the metal pores exposed to and coated with this accumulation, which sticks to raw metal much more tenaciously than it does to a sealed surface.
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When piloting an Audi if you enter a corner too fast for road conditions (wet or snow or mud) and suddenly let off the gas to slow yourself down (which is what most people do) you will experince oversteer. This simply means the back end of the car will slid out and point the car sharply into the corner as the front end trys to swap places with the rear end. ESP will try to save you by electronically applying individual brakes to individual wheels to get the audi pointing the right way.
It sound like you have touch all the base, so your going to need to check the dust shield on the back side of the rotor. Make sure that it has not gotten bent forward towards the rotor and wheel rim area of travel. It's a common thing to happen as the brakes heat up the dust shied warps slightly and if there is not enough gap between the dust shield and rotor, and rim will make the chirping noise you hear. You may not even have top remove the wheel to fix this, just turn your wheel all the way to one side so you can get to the back side of the brake assembly and push the dust shield away from the rotor/wheel area. Good luck and hope this helps. keep me posted. be glad to help you get rid of that Gremlin.
The timing belt interval used to be 120k, but after numerous timing belt breaks and a class action lawsuit against VAG, Adui has changed the interval to 80k..However, i have seen them break even at 70k miles. Unless you see paperwork that it has been done, just plan on replacement before 70k. Better safe than sorry, if it breaks it costs thousands!