Rubbing noise and pulsing brake pedal

[Jepor]

Hi All 

I'm having an issue with a pulsing rubbing noise coming from my A6 at low speed and brake pedal slightly pulsing when slowing from 60mph  , it's sounds like a rubbing disc, both pads and discs were changed 5000 miles ago , I took off the wheel and spun the wheels and there is a slight rubbing on and off when spinng the wheel , the disc  seems to be harder to turn at one point , took it back to the garage who installed them and they said they look OK.  My question is could it be a warped disc after 5000 miles or could it be a partly seized caliper ? 

Also when it's a very slight rubbing noise , is it ok to drive on this for a while if its a warped disc ?

Regards 

Edited 3 hours ago by Jepor

[spartacus 68]

More likely to be sticking caliper causing grief. Is the brake disc sitting on a very clean hub? Any corrosion on the hub will manifest itself through the brake disc to the pedal. Also rule out worn wheel bearing.

Drive the car for a few miles and coast to a stop. If the disc is getting hot, you’ll smell it and feel the heat. Tell-tale heat spots on the disc will confirm.

Worn wheel bearing will have constant audible rumble in the background around 40-50mph, rather that tell-tale wheel wobble if you lift car and hold wheel at 10 to 2 position. You can raise car, grip the coil spring and rotate the wheel. Any vibration could inducate goosed bearing.

A full brake dismantle is probably required. Are pads able to move in carrier, etc. Are brake sliders seized?

Yes, okay to keep driving, but avoid heavy braking. Depending on the eventual outcome, you may be swapping out pads again.

[Jepor]

Thanks for the quick response. 

Defo not a bearing its not a constant rubbing noise , it's like a pulsing sound that increases with speed , i can sometimes get a smell of hot metal after a long journey,  and wheels are warm but disc far to hot to touch , I didn't strip the calipers as its the rear caliper with an electronic handbrake and don't have the confidence to attempt that , so can't tell if the hub was clean or not , but my guess is probably not cleaned by garage , all too busy for that in my local garage . Whatever about the safety side of it the noise is doing my head in .