1998 379. Valve at rear drive axle cross member....abs relay combo valve purging air when I release the tractor breaks. So I replaced the entire valve and abs relay assembly. Still leaking from the bottom center of the valve. This has been a gradual issue. At first, months ago, I would release tractor breaks and it would take a second for something to catch and then the tractor breaks would release. Now....when I push in the tractor break button it constantly leaks from this valve. I'm at a loss. Any help will be greatly appreciated.
Thanks,
Toby
1998 379 break relay leaking constantly
Discussion in 'Peterbilt Forum' started by tmslogistics, Mar 10, 2015.
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QR-1 valve.Located under your fifth wheel.Follow the air lines from brake chambers.Only about $25.good luck.
tmslogistics Thanks this. -
Already replaced it when I replaced the abs modules and the valve in the middle. The brake lines coming from the chambers tie into the abs module. There's an abs module for each side....right and left. The bolt onto to the brake relay/purge valve. So.....there are actually 3 pieces/valves under fifth wheel on the cross member above the rear drive axle. All is brand new.
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Tractor brakes will not release.
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Maybe unhook service lines from brake chambers, should be marked, and farthest from slack adjuster. Release the brakes, if air comes out of one of the chamber ports its bad. If their rubber hoses you can just pinch then off one at a time with flat nosed pliers one at a time. Use chalks don't get rolled over.
tmslogistics Thanks this. -
The qr1 valve is on the front drive axle....not the rear drive axle. Correct.
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I had same problem while ago.. I replaced a quick release valve just above front axle.. that was it..
tmslogistics Thanks this. -
Beltrans,
So......just to make sure we are on the same page....the valve at the rear axle was leaking off. So you replaced the valve on the front axle, the qr1, and that solved your problem?
Thanks for your help everyone. -
internal Maxi chamber leak ??
beastr123 Thanks this. -
QR-1 valve on front drive.That's what I said (meant)Good luck.
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