Replaced rear brakes - now 1 side hot & grabby

[Wickedstick]

Proportioning valve?

Where is it? I can’t find anything on a diagram or search that shows where it is.

 

[SUBURBAN5]

Thats built into the abs module on the front side of the firewall. Infront of the brake booster

 

[Wickedstick]

That’s what I thought. I have the Kelsey hays module. It could be that but I would think it would cause both rear brakes to drag as one line runs to the back then splits above rear axle

 

[SUBURBAN5]

I agree just wondering if something going on with that brake line. Even if it's at the t. Located above the diff. Even at the wheel cylinder. Doesnt seem like its brakes if you backed off the adjuster and still have them overheating.

 

[Wickedstick]

I agree just wondering if something going on with that brake line. Even if it's at the t. Located above the diff. Even at the wheel cylinder. Doesnt seem like its brakes if you backed off the adjuster and still have them overheating.

I replaced that soft line that goes from the diff to the chassis. Also replaced both front calipers and soft ones associated with those. Also replaced master cylinder. Also replaced both wheel cylinders. Also had rear end rebuilt to install limited slip.

 

[Wickedstick]

I replaced that soft line that goes from the disk to the chassis. Also replaced both front calipers and soft ones associated with those. Also replaced master cylinder. Also replaced both wheel cylinders. Also had rear end rebuilt to install limited slip.

It’s going back into the shop tonight. Will hopefully have some answers tomorrow.

 

[Wickedstick]

Shop says abs module holding pressure. Seems odd to me though because only one line runs to the rear and splits in middle. Shouldn’t it hold pressure on both sides of it was holding pressure?

 

[SUBURBAN5]

You would think so but since its built in with a proportioning valve it wouldnt surprise me. I've heard of guys on here having issues with em. Plus a lot of issues with the abs module. I thought there was a test though on hear where you pull the fuse and see if it's still acting up

 

[Schurkey]

Rear brakes have shared hydraulics from the rear brake hose forward. What affects one rear brake hydraulicly affects the other, until the system splits after the rear brake hose at the rear axle.

 

[Wickedstick]

Rear brakes have shared hydraulics from the rear brake hose forward. What affects one rear brake hydraulicly affects the other, until the system splits after the rear brake hose at the rear axle.

I assume this means that if one was dragging the other would drag if it was an abs module issue? Being that isn’t the case, I likely have some other issue?