Brake warning light

[RICHD962]

Hello

I ve just bought an 1999 audi cabriolet and the brake warning light on the dash of my audi cabriolet flashes as it should when the ignition is turned on, but remains flashing for about ten seconds more after the other lights go out. After starting the car the first time the light extinguishes as normal on subsequent starts. The brake fluid levels are ok and the pads have been changed recently.

Any thoughts would be appreicated

[Alan02]

Pad wear sensor wire fault, check wire and connectors for breaks,corossion etc.

[scotty33]

Hi

If your cab V6? has Hydraulic brake assist, this could be a low pressure warning. When the engine starts in the morning the system builds pressure up until it exceeds the pressure switch warning (approx 120 bar I think)
The system should store pressure, which means fluid is leaking away overnight, could be internal leakage at the hydraulic servo/booster, or it could be an accumulator problem?

In reality, as long as the system pressurises ok and you get hydraulic assistance for say 6 presses of the brake pedal (after turning the engine off) all should be well. It might be worthwhile flushing/changing the hydraulic fluid, makesure it complies with Audi G002000 or the newer Version G004000 which supercedes it.

see links for more info/tests

http://www.20v.org/brakprob.htm

http://www.sjmautotechnik.com/trouble_shooting/brakeTSB47_92_2.html

http://www.sjmautotechnik.com/trouble_shooting/brake.html#bomb

http://www.sjmautotechnik.com/trouble_shooting/susp.html#hydoil

http://sites.internet.lu/folders/customautocraft/typeB3-B4_80_90_S2_RS2.htm#BRAKES

[RICHD962]

Hi

thanks for your reply. its the 1.8 so im guessing its a different system from the v6 but thanks for the suggestion, appreicated.

[RICHD962]

thanks alan ill have a look once i get the wheels off (just realised the alloy lock nut key is missing:aargh4:)

[scotty33]

Hi

thanks for your reply. its the 1.8 so im guessing its a different system from the v6 but thanks for the suggestion, appreicated.

Not sure what system the 1.8 uses, sorry. Fault sounds consistent with a hydraulic problem, if it's vacuum assisted, it can't be. Good luck with it:beerchug: