Question about 1991 Toyota Pickup

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Brake Problem - Brake Won't Quit on my 4 x 4

I developed a leak in one of the break lines going to the rear. I replaced both the primary and secondary brake lines (it was the primary that blew) reasoning that they both had the roughly the same lifespan. I replaced the sections beginning at the first "union block" from which the primary brake lines split off to the front WCs. I proceeded to bleed first the MC then all of the individual WCs. The pedal still went to the floor. I then bled the Load Sensing Proportioning Valve (LSPV - the little square gizmo mounted above the right, rear WC). I did not touch anything on the LSVP but the bleeder valve. Presto! Now I had full resistance on the brake pedal. But now the brakes won't entirely release. Additional information: front pads were replaced not long ago. Rear shoes, never. Also the E brake handle goes full travel but does not activate brake. My gut tells me that the LSPV is involved somehow. Is there a connection here? Like, no brakes in the rear causing full extension of WC piston throwing the LSPV off balance or is the LSPV out of whack? Both? Neither?

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  • kbayer200314
    kbayer200314 Jan 07, 2009

    I have a 1988 4runner that i just replaced a bad rusted brake line to and my brakes still only work the front end.. when i got the truck the guy that had it said in 13 years the parking brake never worked.. I am in need of help.. I get fluid out the LSVP when I bleed the brakes but still the pedal goes to the floor.. what next.. i have read that its probably not the valve.. could i have someting else sticking or not getting fluid to.. Keep in mind this is the rustiest truck i have ever seen, but the lines are not that corroded and 2 are nre from the valve..

  • Anonymous Mar 24, 2014

    which line goes to the inlet marked F on the lspv

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  • Toyota Master
  • 1,861 Answers

The LSPV is not the issue. It simply allows more fluid to go the the rear WCs whilst carrying a load. More load = more fluid to the rear brakes.

What I suspect, based upon the info you have provided so far, is that the rear brake pivot mechanisms, for the park brake, are seized. Pull on the rear park brake cables at each side, and see if the metal thing on the backing plate moves freely. If not, that metal thing is seized, and either needs taken apart & lubed, or, if it is severly seized, replaced. This is a VERY common problem. Rectify the park brake pivot concern, readjust the rear brakes, and see if this does not cure your problem. If you have any other question, please feel free to post back.
Hope this helps, and, thanks for choosing FixYa!

Posted on Nov 03, 2008

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