Why does the abs disengauge when you lock in 4x4

[raptorman03]

I have a 1992 chevy half ton. is there a wire to cut so i can have abs all the time?

[TLS]

Personally, I feel ABS in 4WD isn't that desireable in the first place. The way GM had it setup was basically to prevent rear wheel lockup as pickups are real light in the rear. This was a safety concern that they decided to address in the 1988 M/Y, and it wasn't until '93 or '94 that they went to a 4 wheel ABS. And I'm not even sure IT stays active in 4WD. The newer trucks DO, but if your in 4WD, your axles are locked mechanically. How they work this is beyond me.

I'd just leave it alone. Be glad it even works in the first place. They're know to go bad.

[Mark Witcher]

The older 4 wheel drives only had the ABS on the rear axle. No you cant make it work in 4wd.

[tuna]

Shouldn`t the answer be obvious? in 4wd you don`t want the rear brakes pulsing while the front is not .Different wheel speeds front to rear cause a bind.

[PackRat]

Personally, I'm amazed that your ABS is still working. I'm a diehard bowtie fan, myself, but that 1st Gen RWAL is unreliable. The ABS computers were known for failure.

I'd use it as is, until it fails, then pull the ABS fuse, so the light will go out.

[Turfmower]

I know my ABS works in 4WD on both my 95 and 04 3500s

[derekbroerse]

I have rw ABS on my '90 S15... it doesn't work either. Funny part is that every once in a while the light comes on, as simple as unplugging the computer and plugging it back in (by the master cylinder) and the light goes away again.... :p

[derekbroerse]

I take that back. After further 'scientific testing' (slamming on the brakes while on ice with my head hanging out the door :D) it seems to work just fine.

Hmmmm no wonder it always stops straight in the snow!!