Y2Krunner

i recently went out 4wheeling and lost my rear brakes during the outing. i was stuck on a hill and had the brakes pressurized for a while (to keep from rolling back cause the e-brake didnt suffice at the time). Once to the top of the hill, my brake pedal went to the floor with a little braking ability on the fronts. once back in town the pedal felt fine again but no rear brakes. i would assume if i blew a line or something i would have a loss of brake fluid or something. Any ideas why neither of my rear brakes work while the pedal and fronts work fine?


BTW 92 4runner

94x4

Perhaps it is that your rear brake proportioning valve went out?

Try doing a Search for "LSPV" or "BPV" for information about troubleshooting, repair or replacement.

Y2Krunner

i raised the BPV with a makeshift bracket when i did the rear lift and that was my first outting after re-locating it....

94x4

Perhaps you raised it too far? Have you tried the Search yet?

Y2Krunner

doing it as we speak- i didnt even think to look into the LSPV at first..

bob200587

rear master cylinder? My front brake master cylinder failed and I had a minor accident because I was only able to use the rear brakes....hardly sufficent to stop the truck.

94x4

Uh, what "rear master cylinder"????

Adam F

Yea, you only have ONE master cylinder.

LittleRedToyota

yep, only one master cylinder...but it does have two separate pistons inside of it...one for the front brakes and one for the rear brakes, so it is possible that the seal for the rear brake piston is bad...still need to either re-build or replace the whole thing, though.

LSPV would be my guess, too, though. especially since you recently worked on it.

Y2Krunner

i still havent had a chance to test drive it as i have other things to do to it while its up on jacks, but i took my make shift LSPV bracket off and used the stock mounts. When i spun the wheel and hit the brakes they grabbed a bit- will update after i take it out.