sanadrustom

I was wondering, Can the rear dif on my s6 be seazed? If so what would be the symptoms. I'm trying to figure out if it's the rear dif or my break calipers due to me feeling like the car is dragging when I'm driving it. Though if the break calipers are seazed wouldn't I smell stone sort of break burn after stopping?

sciroccosven

Theoretically if your rear diff seized you wouldn't go anywhere because your rear wheels wouldn't be able to turn.

The best way to check if your brakes are dragging is on the road, put your car in neutral and let it coast without gas or brakes. If it coasts like normal you might have a misfire and not realize it giving you sluggish feeling performance.

If your brakes are dragging you should definitely be able to smell the pads heating up. How much pad life do you have remaining? Any sign of heat, light smoke out of the rear wheels after a long drive?

GoHeels

Brakes should definitely start to smell after a mile or so, I've left the e-brake on 1 click before You should also be able to open the driver door and push and roll your Audi a bit on flat pavement, for a simple test.

tenspeed

Touch each wheel after a short drive. A seized caliper will warm the rim. Try the front wheels too.

sanadrustom

Well this is what I have done so far, while driving on a reasonably flat road not going up words or down words and I put the car in neutral it starts slowing down as if someone is lightly applying the brakes. Going down hill doesn't do it though once it was slowing down going down hill and it was a pretty good down ward hill. Also while at a light and I just move the car forward a foot or so and just let off the gas the car comes to a stop as if the brakes were applied. I hope what I'm saying makes sense

UrS4boy

After leaving the car to cool overnight, start the car and drive around a couple of blocks and come home and park the car. Put it in gear with the engine off and do not touch the Ebrake. Get out of the car an gently touch the wheels near their center. Be careful. The wheel with the stuck caliper will be warm to hot whereas the the other wheels will be only slightly warm or even cold.

I had this issue on one of my UrS4s before Christmas and it was the left rear caliper. I didn't have time to change it so I removed it, removed the Ebrake cable and got the ebrake cam back to its OFF position, I used a caliper piston tool to turn the piston back out a bit and then reassembled with the eBrake cable OFF the caliper. I have bought a new caliper but I haven't put it on the car yet. (On the list of things to do)

sanadrustom

So I took it for a drive, all 4 wheels are cool to cold not a sign of heat so that kinda rules out that.... Our does it? Anything else that comes to mind?

tenspeed

How's your tire pressures? Tires will lose one psi every month and will drop one psi for every 10*F decrease.

sanadrustom

Would that cause drag? The car feels like it's fighting something while accelerating

I'm starting to think I have a lemon