B7 RS4 Brakes keep warping
Discussion
I have never used a forum before and I am wondering if anyone can help with the following problem. I have a B7 RS4 cabriolet. At present it has around 27,000 miles on the clock. I purchased this some 2 months ago and never noticed a wobble when braking on my test drive. But upon driving home and hitting motorway speeds I noticed a wobble of the steering wheel while braking but only between 75 down to 65 MPH. I purchased the car privately and had to fly up the country to pick up ( in hindsight maybe not the best plan) . When purchasing the vehicle the seller had full records of the car going into Audi garages for services/MOTs and repairs from the first day it was purchased, and the last shown was a service with new disk and brake pad change at Audi in Slough in January 2015 at around 23,000. I have a good friend who owns a mechanics Shop and racing team and took the car to him for an inspection. We changed the discs and pads for genuine Audi parts and I had no wobble while braking for 1400 miles. The wobble has now returned ( and is now very noticeable ) at 1700. But this now happens when braking between 45 down to 35 MPH. The garage I took the car to is very reputable and I also know they bedded in the brakes. I drove normally ( that is not hard, and 50% motorway miles 50% town) with no holding the brakes at stops etc. After looking deeper into the cars history it seems that this has been happening repeatedly for the last 15,000 miles ( no accidents that I can find or am aware of) and audi previously have changed the brakes and pads as good will. Has anyone ever come across this issue before? If so how was it resolved? I previously had a B7 RS4 saloon in 2009 to 2011 and never had this issue while putting 50,000 miles on the car. Any ideas welcome please. (Apologises for the long explanation )
I had a B7 that warped two sets of disks and the dealer was unable to find the cause (despite doing the work under warranty). An independent (who was able to do more than just read the computer) found that one of my hubs was off - presumably from me kerbing it at some time. Replacing the hub was a lot cheaper than the disks!
From my similar experience, it will most likely be a hub issue. As suggested, check the run out.
If you've been driving enthusiastically, it could be pad deposit on the discs. Skim the discs and replace the pads followed by some proper bedding in should solve it.
It might be worth upgrading the pads at this point, too.
Darren
If you've been driving enthusiastically, it could be pad deposit on the discs. Skim the discs and replace the pads followed by some proper bedding in should solve it.
It might be worth upgrading the pads at this point, too.
Darren
This issue is common and extensively covered on sites like RS246.com
It's most likely pad deposits that build-up through insufficient braking and sitting on the brakes when the discs are hot. Deposits build up that are actually harder than the disc material. The steel disc then wears away leaving high spots.
I replaced my RS4 discs when I got the car, 2,000miles later it was back. So i changed them again, bedded them in properly (which is some task), made sure i never sat on the brakes and gave them a right good work-out every now and then. Never had further issues over the following 3 years of ownership.
It's most likely pad deposits that build-up through insufficient braking and sitting on the brakes when the discs are hot. Deposits build up that are actually harder than the disc material. The steel disc then wears away leaving high spots.
I replaced my RS4 discs when I got the car, 2,000miles later it was back. So i changed them again, bedded them in properly (which is some task), made sure i never sat on the brakes and gave them a right good work-out every now and then. Never had further issues over the following 3 years of ownership.
Guffy said:
This issue is common and extensively covered on sites like RS246.com
It's most likely pad deposits that build-up through insufficient braking and sitting on the brakes when the discs are hot. Deposits build up that are actually harder than the disc material. The steel disc then wears away leaving high spots.
I replaced my RS4 discs when I got the car, 2,000miles later it was back. So i changed them again, bedded them in properly (which is some task), made sure i never sat on the brakes and gave them a right good work-out every now and then. Never had further issues over the following 3 years of ownership.
that's a good insight, thanks, My RS6 has brake vibration, the dealer has told me pads and disks are worn out, Which in truth they are. But I have noticed the disk vibration for a while.As its auto, I'm often sitting on the brakes, especially after coming off a motorway junction, when stopping from x mph can get them a little hot! I'll watch out for that in future. It's most likely pad deposits that build-up through insufficient braking and sitting on the brakes when the discs are hot. Deposits build up that are actually harder than the disc material. The steel disc then wears away leaving high spots.
I replaced my RS4 discs when I got the car, 2,000miles later it was back. So i changed them again, bedded them in properly (which is some task), made sure i never sat on the brakes and gave them a right good work-out every now and then. Never had further issues over the following 3 years of ownership.
shtu said:
Arwcontracts said:
I have a good friend who owns a mechanics Shop and racing team and took the car to him for an inspection.
Get him to check the runout on the discs and hubs.If you're in/around the south east Marcus of http://www.discskimmers.com/ is very experienced with these.
RGambo said:
Guffy said:
This issue is common and extensively covered on sites like RS246.com
It's most likely pad deposits that build-up through insufficient braking and sitting on the brakes when the discs are hot. Deposits build up that are actually harder than the disc material. The steel disc then wears away leaving high spots.
I replaced my RS4 discs when I got the car, 2,000miles later it was back. So i changed them again, bedded them in properly (which is some task), made sure i never sat on the brakes and gave them a right good work-out every now and then. Never had further issues over the following 3 years of ownership.
that's a good insight, thanks, My RS6 has brake vibration, the dealer has told me pads and disks are worn out, Which in truth they are. But I have noticed the disk vibration for a while.As its auto, I'm often sitting on the brakes, especially after coming off a motorway junction, when stopping from x mph can get them a little hot! I'll watch out for that in future. It's most likely pad deposits that build-up through insufficient braking and sitting on the brakes when the discs are hot. Deposits build up that are actually harder than the disc material. The steel disc then wears away leaving high spots.
I replaced my RS4 discs when I got the car, 2,000miles later it was back. So i changed them again, bedded them in properly (which is some task), made sure i never sat on the brakes and gave them a right good work-out every now and then. Never had further issues over the following 3 years of ownership.
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