This has only happened twice both times have been after a carwash were my low traction light turns on when I'm trying to brake and my car brake pedal goes all the way down I have to let off and pump them again to brake wtf is this. I tried searching but maybe I'm wording the search wrong

 

Found some info but not really helpful. Ill just delete ABS hope it works either way my ABS inop light is always on

 

Wet ABS sensor getting fooled into thinking a wheel or wheels are turning slower than the others. ABS pump & modulator act to reduce line pressure to a wheel or wheels that aren't really locking. Pedal goes way down, low traction light comes on.

Year of car? 3 channel or 4 channel rear? Seen what condition the wheel speed sensors are in lately? (rust / crud buildup + water adversely affects the wheel speed sensor signal).

 

Check your wheel speed sensors.

Front Wheels - 2 plugs one each on the back of the hub
Rear - 3 Channel is on top of the rear diff
4 Channel is on each rear wheel.

Same thing happened to me and it turned out to be a bad front wheel speed sensor - bulit into the hub so you have to replace the whole hub.

 

Well its a 95 z28 m6 I got the rear off of a 97 z28 A4. Ill check it right now it'll be a min before I get back to responding.

 

The 95' runs the 3 channel ABS and the 97' runs the 4 channel and that could be your problem. Did you modify the diff to run the 3 channel?

 

^ My 95' has the stock 4ch rear? Are you sure about that?

 

Only if you have TC (traction control) installed will you have the 4 channel and in 95' it was not that common.

 

Yea I think that's my problem it has traction control and my car doesn't. I'm gonna lift it and pull the rear out.

 

My ABS and Traction are both non functional. Happened after my headers were installed.