A8 issue under hard acceleration
#13
Possibly.
And if it IS an ESP problem, acceleration tripping it could point to EDL (rear electronic differential lock), which is aided by the spinning tire being braked individually...which could be hindered by a failing ABS sensor (or something else) at that corner.
That's just a guess.
Another possible cause is usually tripped during braking....failing EBD (electronic brake pressure distribution) preventing overbraking of rear wheels before ABS kicks in.
Some of this depends on specific ESP system in your model...more than one have been used in different models (don't know years/model?) with same functions, but different warning patterns. If problem persists, you need a code read by Vag.com.
#16
A8 W12 brake warning light under acceleration
Did you figure out the solution?
I have exactly the same problem in my '05 A8 W12. When I accelerate hard the brake warning light flashes and beeps in the secondary MMI display, and the brake warning light in the speedo comes on. Stops as soon as I throttle back.
I have exactly the same problem in my '05 A8 W12. When I accelerate hard the brake warning light flashes and beeps in the secondary MMI display, and the brake warning light in the speedo comes on. Stops as soon as I throttle back.
#17
^^^
Regarding brake fluid, I have not had a service recently so have not tried it.
I have not solved it, wish I did.
I had originally reported I couldnt repeat the issue, but I do now still occasionally get the same behavior I originally reported and you also report.
Regarding brake fluid, I have not had a service recently so have not tried it.
I have not solved it, wish I did.
I had originally reported I couldnt repeat the issue, but I do now still occasionally get the same behavior I originally reported and you also report.
#19
Top off the brake fluid. The red "BRAKE" light is for fluid level low warning. It beeps and flashes to get your attention. The ESP/ABS will disable itself if it sees low fluid constantly, only as a default. Also, good idea to have a look at your brake pads. As they wear and the pistons are further extended, the brake fluid level drops in the reservoir.
#20
Top off the brake fluid. The red "BRAKE" light is for fluid level low warning. It beeps and flashes to get your attention. The ESP/ABS will disable itself if it sees low fluid constantly, only as a default. Also, good idea to have a look at your brake pads. As they wear and the pistons are further extended, the brake fluid level drops in the reservoir.
I can confirm aspen79's post. I topped up the brake fluid (although had trouble seeing whether it was low or not) and the problem vanished.