audinought

So I'm stopped at drive through sitting idleing in my '94 90Q & the anti lock off light comes on. As I pull away the car is vibrating like the the anti lock is in operation(or the engine is about to stall, I'm not braking at this time). About a block later as I turn into the driveway at work I brake hard to see what happens & the light goes off & everything seems back to normal. What just happened? A sign of trouble to come? Thanks

a9094

Hey mate,
I have a SOMEWHAT similar problem on a 94 90csqSport:
The [Antilock OFF] light came on (happened around three months ago), I have decided to test my brakes to see if it is actually on or just VDO light misfiring, so I braked hard, and no ABS. Right after that, [Antilock OFF] went off, and ABS started working again.
The same day, in the evening, I turned the engine on, [Antilock OFF] came on again, I've decided to reset the engine (just ON and OFF), and the light went OFF, so this technique was working for a week, until [Antilock OFF] kept on at all times.

What I have done:
I have changed my fuse (31 I believe), and [Antilock Off] went off, and never went on for about three to four weeks.

I have went to scan it at my local garage (Audi certified), I was told my rear left ABS Sensor needs to be changed. 240$ for the sensor, 100$ for labour.

What I also noticed is that everytime it (ABS) turned on while driving (rarely, but happens), my brake pedal, while braking, vibrates like if ABS was stopping my car.

Anyhow, as I said, its SOMEWHAT related to my problem on the same car of the same year.

peace!

Luxus Panzer

pull sensor out, clean it off... re install. worked 4 me

audinought

Thanks, that sounds like the problem. I'll try & locate the sensor & give it a cleaning. Is it in the caliper?

9590SQ

It's on the knuckles, just pulls right out. But you probably figured that out already.

a9094

my sensor is stuck... looks like rust. Oh well, have to find a used one for now

9590SQ

wd-40 can help loosen the rust, first twist the whole sensor, it just sits in the hole with a copper/brass like shim inside. That's all that holds it on. Try to lift up on the rubber seal that goes around and spray under that...

CRAZY_RUSSIAN

i head the same problem trying to take the sensor out... at the end, i got a new sensor :-$
the dang thing would not come out

lovely09

Same thing here.I already order a new sensor and will change it as soon as the product will arrive here.

cuatrokoop

Water Displacement - 40 is not a good oil to penetrate and loosen rust. It helps prevent rust sure. But Kroil, PB Blaster, Liquid Wrench, etc all do a better job, as that is what they were designed to do.