Rear brake problem

I have a 96 tacoma I picked up for cheap. I’ve been doing a ton of work to it. Full ome kit, jba uca, complete oem front end rebuild etc, new clutch, wheels/tires and more. I’ve got this brake problem though. The brakes where pretty new when I got it and don’t remember if the problem existed then or since I’ve done this work as I really haven’t driven it before or after all that much. Just been working on it. Anyways, the rear passenger brake is super touchy when the rig is cold. It easily locks up until I’ve driven a half mile or so. After driving it for a sec the pedal seems to feel a little softer and there is zero issues. I’ve looked over the brakes, bleed them etc. maybe a booster problem? Just curious if anyone has had a similar issue and found the problem. Hoping to not just throw potential fix’s at it. Thanks

 

I would pull both drums and make sure that everything is dry inside i.e. no oil or brake fluid leaks.

Also, I don't think that a problem with the booster would affect only the rear brakes.

 

Sounds like the rear brakes are not adjusted properly, or there is a sticky wheel cylinder. Got a laser thermometer? Take a temp of the drum on each side. If the passenger is way hotter than the driver, it's dragging.

 

Could the LSPV [load sensing proportioning valve] be acting up perhaps? Maybe it's diverting too much braking force to the rear for one reason or another?

 

This is what was going on with mine. Rear seals were leaking slowly and everything was just saturated with oil.

 

he says only the passenger rear is acting up. The outlet of the LSPV splits the fluid to both rear wheels, so it would affect both rear wheels if it did act up

Sounds like a sticking or oil/fluid contaminated brake

 

lift the truck up when its cold and spin the rear passenger wheel and compare it with the other side. If it spins less than the driver side then maybe a quick adjustment will take care of it.... Thats if theres no leaks and everything else checks out. Doubt its the booster or the load proportioning valve

 

Sorry for the delayed reply. Been out of service. After I wrote my post I’ve been thinking about it. I don’t think it’s a booster. Kinda a dumb idea on my part. I was just spit balling ideas. Being that it’s just the passenger side I don’t feel like it would be proportioning valve either. Although I do want to delete it. I don’t completeling trust it. I’m from the west coast so no rust issues but it just appears old and worn out. I pulled all the drums off and inspected/cleaned everything. The way I understand these brakes is they adjust off the Ebrake? So in theory should adjust when I use it? All the internal drum parts look good and relatively new. But the drums don’t look like they’ve been replaced recently. I’m wondering if the passenger side is just getting hung up easily until it’s driven and warmed up a bit. I might just order a new kit and replace the drums or all parts and see what happens. A complete power stop rear drum kit is only like 175 on rock auto.

 

You need to do a temp check on the drums to see if one is dragging more than the other.

Just opening up the drums and looking at things isn't going to tell you if you have a sticky wheel cylinder.