Anti-lock brake warning light
#1
Drifting
Thread Starter
Anti-lock brake warning light
I've been getting a re-occuring warning light for the anti-lock brakes...
Thing is, it's not constant. I'd say maybe 15% of the time I drive the car, it triggers.
If I pull over and turn the car off and turn it back on, it generally (always) stays on. But the next day or two when I get back in the 993, it's almost always off.
Any thoughts on what's going on here? Thx.
ps- I guess considering how much time I spent racing cars without ABS, it doesn't frighten me all that much so I haven't really focused on because it's not constant.
Thing is, it's not constant. I'd say maybe 15% of the time I drive the car, it triggers.
If I pull over and turn the car off and turn it back on, it generally (always) stays on. But the next day or two when I get back in the 993, it's almost always off.
Any thoughts on what's going on here? Thx.
ps- I guess considering how much time I spent racing cars without ABS, it doesn't frighten me all that much so I haven't really focused on because it's not constant.
#3
Drifting
Thread Starter
Hmmmm, interesting question.
The more I think about it, the more I'm not sure. I wanna say that it happens just when I start the car but can't say for certain.
Cause I feel like today, it came on when I was already driving.
- What would it indicate if it came on while driving vs. startup?
The more I think about it, the more I'm not sure. I wanna say that it happens just when I start the car but can't say for certain.
Cause I feel like today, it came on when I was already driving.
- What would it indicate if it came on while driving vs. startup?
#5
Drifting
Thread Starter
Hmmm, interesting... No, didn't wash but:
There is a spot every time I leave my neighborhood where there is a little stream of water in the road. The trail of water happens to be at this corkscrew left hand turn. Admittedly, I let the tires get wet then break the back end loose while shuffle steering/setting slip angle and throttling thru it. It's hella fun!
I think I noticed today, it went on shortly after I did that. That could make sense.
Is it possible the ABS system needs to be replaced?
Worst case scenario, what are we looking at?
There is a spot every time I leave my neighborhood where there is a little stream of water in the road. The trail of water happens to be at this corkscrew left hand turn. Admittedly, I let the tires get wet then break the back end loose while shuffle steering/setting slip angle and throttling thru it. It's hella fun!
I think I noticed today, it went on shortly after I did that. That could make sense.
Is it possible the ABS system needs to be replaced?
Worst case scenario, what are we looking at?
#6
Nordschleife Master
The anti lock brake light used to come on in my c4 at cold start only, it use to stay on for about 30-45 seconds, I taught it was normal until I had my brakes bleed and than it stopped doing It, I don't know if it's because the brake fluid was dirty or what...
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#8
Drifting
Thread Starter
Why would that cause a malfunction though? The brakes don't feel like they need a bleed. I have plenty of pedal.
#9
Rennlist Member
I had the same thing happen and I was a little low on brake fluid. It was intermittent just like your scenario, turn off the car and then start up again, no light Topped it off and the light quit coming on, flushed the fluid not long after that and have not had the light come back on.
#10
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
I do not think the C2S uses a pump assist but cannot remember, it may depend on the brakes you have as well.
Cheer,
Mike
#11
Rennlist Member
ABS light, or brake pressure warning light...there's a difference. C4, C4S, and TT have the pump that Mike refers to. My car just started having the pressure warning light stay on for 7-10 seconds on initial start up, first thing-never on a restart.
My local P car tech says that's normal and acceptable. I'm planning of brake fluid change after my vacation, and road trip. My 90K will be here soon enough...
My local P car tech says that's normal and acceptable. I'm planning of brake fluid change after my vacation, and road trip. My 90K will be here soon enough...
#12
My light comes on during a drive. I cleaned the ground straps for the ABS sensor. Where is the speed sensor? Is that the same as the ABS sensor on each wheel?
My fluid has been changed and the fluid is still high. Any idea? Would an OBD give any code?
My fluid has been changed and the fluid is still high. Any idea? Would an OBD give any code?
#14
Pro
Hi
I had something similar on my 993, was the speed sensor. I do not know about 964's but it was a pig to remove. I have some advice if they are similar and yours is corroded into the hole.
Berni
I had something similar on my 993, was the speed sensor. I do not know about 964's but it was a pig to remove. I have some advice if they are similar and yours is corroded into the hole.
Berni