Brake warning light on startup

**pippip** · 21-08-2009,11:25 AM

Audi A4 2002 1.8T - 72k

Recently when I start the ignition I get the red brake warning light flash and beep at me three times on the centre display between the dials. At first i would only get it once out of every ten startups but now has become more often.

It only happens on startup, never when driving, but unlike all the similar stories I have read I don't get any abs warning light at the same time. I don't seem to be leaking anything and the brakes feel fine.

Any help welcome before I get mechanic to double check everything.

Many thanks

**kite** · 21-08-2009,11:54 AM

A8Tech done a write up on this....
I think its a low voltage spike that sets it off.
Check your battery.

**Embisix** · 24-08-2009,10:16 AM

Does this happen when you're parked on quite a heavy camber (to the left) by any chance?

My brake warning comes on sometimes when the left side of the car is kerbside on a steep camber.

I think it's probably down to the fluid falling away from the level sensor in the resovoir.

Obviously checked all my levels and for leaks etc. and have seen no problem, so I don't worry about it.

**pippip** · 24-08-2009,10:51 AM

in reference to the battery, the car doesn't sound weak when starting but I'll get it checked.

I do park on a slope, facing downhill, not left or right. Not too steep. I cant see any leaks but I'll keep checking the brake fluid levels over the next few days.

The last two days, it has beeped as usual from startup and then again when I'm leaving my estate (about 30-60 secs later).

I also noticed one time last week then I drove to the shop (2mins away) and it beeped as usual on startup and then again when I came out of the shop.

Not too worried about it but just really annoying, as I said no problem with braking.

**delv6** · 24-08-2009,08:46 PM

I have the same issue, checked brake fluid res and was fine so disconnected the brake fluid level sensor and it stopped so thought ah need a new sensor but now its started again without that sensor refitted so mr AA man, another issue, has said it may be a faulty brake pad sensor that is intermittent. He reckons with the right VAGCOM software you would be able to prove this one either way so thats my next step, could be same for you..

**a8 tech** · 24-08-2009,08:52 PM

https://www.vwaudiforum.co.uk/forum/s...=brake+warning

**kite** · 24-08-2009,08:58 PM

I looked for that thread and couldn't find it

**toff** · 24-08-2009,09:58 PM

Take a look at this thread too.

https://www.vwaudiforum.co.uk/forum/s...ad.php?t=56355

Hull Audi retro-fitted a relay / wiring to my 3.0 which sorted the problem!

Toff.

**a8 tech** · 24-08-2009,10:02 PM

I forgot about that one,too many posts lol

**pippip** · 24-08-2009,10:18 PM

Many thanks all, that last link looks to be the problem. A bit short on cash at the moment so will have to scrap some together and get down to Audi. Think I'll ring around as the first garage I rang didn't have a clue so will try and get someone who has at least heard of the problem.

Again many thanks, and will report back when I finally get it sorted.

I'll try that check button test first.