red brake wrning light

[timucin]

now i have red brake warning light...
-fluid is ok
-pads are ok
-lines are ok
-connections are ok

what can happen?
it lights sometimes and goes off?

they connected to computer,nothing is wrong...

[Cobstar]

Hi

I used to get the chimes and warning light intermittently when I was driving up a farm track. Brakes seemed OK, no brake fluid leak, and nothing picked up at a service. Then a drive shaft gaiter leaked big time and had to be replaced. Since then no problems with the warning signal when driving up the farm track! Though have to say garage didn't think there was a connection.

[markcanderson]

Possibly a failed Brake Pressure Accumulator ? (aka.. The Bomb?)

I quote from the excellent article in S2central.net

Brake Pressure Accumulator - The 'Bomb'

This ingenious component, not unique to the S2, gets it's nickname from the crude physical similarities with one of those comedic explosive devices as featured in Monty Python, The Pink Panther and Road Runner to name a few.

The purpose of the brake pressure accumulator is to provide a reserve of sufficient servo assistance in an emergency brake situation. In normal driving, the power steering pump provides servo assistance, but in emergency braking, the pump provides little assistance to the servo. A worse scenario is the engine stalling under heavy braking. The brake pressure accumulator is designed to provide a reserve of highly pressurised hydraulic fluid for situations when the power steering pump is unable to create sufficient pressure. The 'bomb' is charged with Nitrogen gas under high pressure to independently ensure that brake servo assistance is always available. For further description of the brake pressure accumulator, and how to test it and the power steering pump - follow this link .

Important Note - The ONLY hydraulic fluid which should be used in the S2, is Audi's G002000 - a green coloured mineral based oil. Use of anything else can cause major damage to the hydraulic system.

On a car with a healthy 'bomb', and the engine not running, the brake pedal will require more than thirty pumps to fully discharge the stored brake servo assistance. This results in a 'dead' pedal feel when the servo is empty.

Over time, the 'bomb' can leak - allowing the Nitrogen gas to escape resulting in a loss of performance. When this happens, fewer pumps of the brake pedal will result in the brake servo being emptied (as less and less pressure is reserved in the bomb). When the number of pumps gets below twenty then think seriously about replacing the bomb... and when it gets below ten pumps, the bomb is very close to the end of its useful life.

Eventually, when the bomb is well and truly past it's best, a pressure sensitive switch in the brake servo will activate a red warning on the Autocheck system alerting the driver of a brake problem. Such an alert will often clear when the engine is started and servo pressure is temporarily restored by the power steering pump. If the pump is not providing adequate pressure then the red hydraulic system alert can also be activated. For more diagnostic details on the bomb, click here...

The full article is here :

http://www.s2central.net/brakes_02.html#bomb

[Greg_S]

Also worth checking the level on your hydraulic fluid since this can throw up a warning light too. And check it freely moves, mine was right level but the float stuck a little and threw the alarm light up. Easily solved though. Just took cap off and freed it up.

[timucin]

thnx for help
will check tomorrow