Wahaudi

Had the front rotors on my S8 replaced (warped) at the dealer this morning. Picked it up at noon and took the slow way back to the office. Pedal seemed a little soft with more than the normal travel.

On the way home, I took the very busy highway. First "panic" stop in the stop-and-go traffic and I almost didn't !!!!! The pedal just kept going without alot of results. It worked, but only barely. I must have missed the car in front of me by an inch. I was way more carefull after that, and each stop got better. Called the dealer and they want to inspect them first thing in the morning.

Also, when I'm stopped with my foot on the pedal, if I just keep pressing hard, the pedal keeps going down. Not quickly, but it keeps moving. More problems?

JimR

Either a really bad bleed job, or a bad master cylinder.

ryoung

See if a few quick pumps on the brake pedal firms it up to rock hard. If so, there's air in the system, and the brakes need bleeding. Several quick pumps should also be able to firm up the pedal with the motor running, but with the vacuum assist, the pedal will not be quite as rock hard.

What I don't understand is how the dealer managed to get air in the system. Whether changing pads and/or rotors, there's no reason to "open" the hydraulic system except to bleed brakes, when the idea is to remove air, not let air back in.

If just bleeding the brakes doesn't solve the problem, I'm afraid Jim may be right ... the dealer probably damaged the master cylinder, and there's a couple of ways he could have done this :-(

Wahaudi

Thanks guys. Funny thing, after the stop that almost wasn't, they got better with each application. By the time I got home, everything seemed pretty close to normal.

This morning, I took it back and had them check things. All checked out ok and frankly they seem ok now. Go figure.

PaulW

Probably just needed to be bedded in