Brake light on when accelerating
Thread Starter
Drifting
Joined: May 2004
Posts: 1,743
Likes: 0
From: Ohio
Brake light on when accelerating
My brake light comes on when I accelerate quickly from a stop. I don't recall this happening at higher speeds when accelerating quickly. It never feels as if the car is struggling so I don't think the brake is actually engaged. Any one have ideas as to what the cause may be and should I be concerned? Car is a '94 A4 LT1.
Intermediate
Joined: Dec 2006
Posts: 27
Likes: 0
From: Port Saint Lucie Fl
My brake light comes on when I accelerate quickly from a stop. I don't recall this happening at higher speeds when accelerating quickly. It never feels as if the car is struggling so I don't think the brake is actually engaged. Any one have ideas as to what the cause may be and should I be concerned? Car is a '94 A4 LT1.
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
The later C4 fluid level switch is very sensitive. Even being a 3/16" too low can turn the brake light on. Top off the fluid to the top of the "full" line in the reservoir and see if that makes a difference. You may only add an ounce, but it's worth trying.
My 92 did this on track days where I would brake hard going into a turn and accelerate hard on the exit. I would get both the Service ABS warning light and the Service ASR warning light. I added about 1.5 oz of brake fluid to the re4servoir and the lights stayed out.
If ASR goes active with it turned on (default), there should be an yellow light on the DIC that says "ASR Active" whenever the ARS kicks in. With ASR turned off, the light won't appear.
My 92 did this on track days where I would brake hard going into a turn and accelerate hard on the exit. I would get both the Service ABS warning light and the Service ASR warning light. I added about 1.5 oz of brake fluid to the re4servoir and the lights stayed out.
mabey the ASR is kicking in. Try it with ASR off.
Last edited by c4cruiser; Jul 2, 2007 at 10:25 AM.
Racer
Joined: Jul 2006
Posts: 306
Likes: 1
From: StLouis, 93 Vert LT1
I recently started having this problem! The red "BRAKE" light comes on in the cluster and Im getting "Check ASR and ABS" lights under a quick acceleration on the display untill I restart the car. Havent checked codes yet? I found this old post in a search hoping to get some sugestions.
