The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Rear discs won’t lock up after frame off build

Dead Parrot · 06-13-2020, 07:40 PM

Not an expert

Most of a PU's braking comes from the front. The systems are designed to avoid locking the rears up. The early ABS on PUs were usually only on the rears for that reason.

I would think the only difference in 3/16 vs 1/4 would be a minor lag in the brakes applying. Probably not noticeable without special instruments. The brakes don't move a lot of fluid when applied.

Are the fronts clamping down tight?

Does that prop valve have any kind of reset button? Some prop valves have an internal valve that will lockout part of the system if there is a leak and there is a magic process to reset it. Possible that got set during the bleeding process.

06-13-2020, 07:40 PM	#2
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,484	Re: Rear discs won’t lock up after frame off build Not an expert Most of a PU's braking comes from the front. The systems are designed to avoid locking the rears up. The early ABS on PUs were usually only on the rears for that reason. I would think the only difference in 3/16 vs 1/4 would be a minor lag in the brakes applying. Probably not noticeable without special instruments. The brakes don't move a lot of fluid when applied. Are the fronts clamping down tight? Does that prop valve have any kind of reset button? Some prop valves have an internal valve that will lockout part of the system if there is a leak and there is a magic process to reset it. Possible that got set during the bleeding process.