I have upgraded to LS1 brakes recently and now I am getting an ABS INOP light. I know of another person with a 93 who also has the same problem.

Here is what happens.... As long as the car is not moving, there will be no ABS light. As soon as I start moving, the LOW TRAC light flashes once and soon after that, I get an ABS INOP light. This is while driving, not while trying to brake. So I think it is not getting a valid reading from the wheel speed sensors.

Now, my LOW TRAC light has been doing that before, so I doubt it is related to my problem. I can tell my ABS is really not working because the brakes are locking under hard braking.

I have checked the parts manuals and noticed that TCS equipped cars had a different wheel sensor part number. Could my problem be that the knuckles/spindles came off a TCS car? If so, what are my options?
Thanks!

 

try cleaning the connections at the wheel sensors first, they may just be dirty and getting a bad connection

 

I upgraded to Z06 brakes and I have no ABS problems. I did make sure my connectors were clean etc before I reconnected everything.

 

Not sure where you are seeing that. The parts book shows the same front hub for 93-02 everywhere I looked. The sensor is part of the hub. Don't think that is your problem.

 

You're right, shoebox. I was looking at the wrong part number. (the sensor in the differential)
I re-bled the brakes today and they brake very well, but the ABS light is still there and they keep locking on harder braking.

I will check the connectors but I doubt that's the problem. Do you guys think that maybe my ABS unit needs to be recycled? I did not have an ABS light before I did this swap so I didn't think that part was necessary.

Unfortunately, I do not have a Tech 2 so if I can't figure this out, I'll have to take it to the dealership to have the code read...
Thanks.

 

Of all the people on this board who would have one, I'm suprised you don't

 

For anyone who was curious about this, I just fixed it.

The ABS INOP light got really old and so did the brakes locking all the time.

I decided to swap my old rusty 93 hubs in place of the LS1 ones. (which look brand new BTW)

I pulled out the wheel, caliper and disc, then removed the hub. I decided to examine it before putting the old one in. Well guess what... one of the connector pins inside it was bent. I'm surprised I haven't noticed that before... I looked 3 times with the wheel on.

As soon as I put everything back together and reset the ABS module - NO MORE LIGHT!!! Yes!!! Brakes work perfect now.