Humanzee

2002 A6 Avant.
The wife has a problem with her car, On cold mornings or when making right turns the red "BRAKE" light on the dash flashes and beeps at her. Then after a few minutes it goes away. It may come back periodically through out the drive but is most noticeably associated with right turns.

I scanned the car with the Vag Com a while back but didn't see any error codes with the brake system. My hunch is that one of the wheel speed / ABS sensors is is either dirty or going bad. I.e. when going around a corner the inside wheels move slower than the outside wheels, if a sensor is fouled out then it might give an abnormal reading or think maybe one of the wheels isn't turning. But why also on cold mornings?

I had to do the ABS controller on my A4 last year but the symptoms on her A6 are different. Also, it feels like there is a bad tire in the front as there is a bit of a shimmy at different speeds. I hope its the tire anyway and not a bearing or something. Because of this I plan to rotate the tires front to back soon. What else should I look for or do that might resolve the brake light indicator and the beeping issue. Is it more likely to be the right or left side.

Thanks in advance.

absolutcq20v

I would think a bad (or going bad) wheel speed sensor would yield at least a code...and NOT trigger the red 'BRAKE' light with beeps.

Humanzee

I'll have to double check that. I suppose the brake fluid level sensor could be tripped if the fluid shrinks on cold days or could slosh around when cornering. I don't think it low though I seem to remember checking that when it first happened.

absolutcq20v

...not the yellow '(0)' symbol in the AutoCheck window?

I could take a glance at the repair manual this weekend for other ideas. Good luck.

Humanzee

I know its not the yellow light. Its definitely the red light that says "Brake". I'm not sure about the beeps though, I think it might be one loud constant beep that lasts a full second or two. I think she must be at lunch because she didn't pick up the phone to confirm.

Grapeking

almost sure then that your brake fluid is low.

ado_dado83

Brake fluid level. I had the same problem months ago