what is it - truck part

[John Dirks Jr]

The contraption appears to take place of the brake line proportioning valve on a motor home. It's mounted on the frame in the area under the drivers seat of a 2001 Dutchman on a Chevy Express 1 ton chassis. The brake lines run through it. It has a reservoir and electric motor. The whole thing is about the size of 4 bricks. What is this thing and what does it do?

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[John Dirks Jr]

I know now. Lets see if anyone else knows.

[Tom Raymond]

Antilock brake control. It makes it harder to stop, but the pads last longer.

[John Dirks Jr]

Bingo! I can't believe I didn't know the second I saw it.

[Chad Fabry]

Antilock brake control. It makes it harder to stop, but the pads last longer.

Yeah, the pads don't wear at all after the wreck.

[Tom Raymond]

I bought a 1990 Ranger brand new. It still had the factory shoes out back (rear anti lock only) after 200,000 miles.

[Jim Baird]

...what a kick. I do manufactured homes and modulars but not RV's.