What the heck is this?
 

'90 3/4 ton Suburban. Rectangular box mounted off the brake booster w/ two weatherpack connectors off the rear.

What the heck is it?

http://i151.photobucket.com/albums/s...0/P1040495.jpg

http://i151.photobucket.com/albums/s...l1180/What.jpg

Re: What the heck is this?
 

RWAL (rear wheel anti-lock brake) module
AKA- piece of worthless junk IMHO
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Re: What the heck is this?
 

I had a feeling it was some type of antilock device. Thanks.

Re: What the heck is this?
 

No problem
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Re: What the heck is this?
 

Looks like a brake controller for a trailer.

Re: What the heck is this?
 

http://67-72chevytrucks.com/vboard/s....php?p=1715755

I've never seen an underhood trailer brake controller...
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Re: What the heck is this?
 

rear only anti lock breaks..i never got tha point of that..

Re: What the heck is this?
 

The idea was the rear end of a rwd would skid first so they tried to control it.Some of the earlier body style had a strap to the axle to a brake valve that would cut off the rear brakes if the rear end lifted up high enough.Ford tried the same thing on the early taurus too.

Re: What the heck is this?
 

That system is on my '83 C30 parts truck and, I believe, my Dad's '86 C30.

Re: What the heck is this?
 

That system is on my '83 C30 parts truck and, I believe, my Dad's '86 C30.

Re: What the heck is this?
 

Learn something new everyday!

Re: What the heck is this?
 

^ True indeed

Re: What the heck is this?
 

My step dad has been a mechanic since the 70s as a kid i grew up helping him fix stuff and going to the junkyards.I would ask what is that what does it do and he would explain things to me.I'm the kind that don't forget dumb or odd stuff and that falls under both lol.