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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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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(DIY Complexity: Moderate / DIY Time: 3.2 hours)

1. Brake Shoe Set

1. Combination Wrench Set
2. Floor Jack
3. Jack Stand Set
4. Mallet Hammer
5. Brake Spring Tool
6. Flat Head Screwdriver
7. Needle Nose Pliers
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1. Brake Cleaner

Step 1 * Secure your vehicle on a level surface, making sure your car will not roll or lean when jacked up.
o Tip: Safety Tip:Always wear safety glasses when working on your vehicle. Wear other personal protective equipment (PPE) when necessary, for example latex gloves or safety shoes.

Step 2 * Break the lug nuts loose but do not remove. Lift up your vehicle using a floor jack.
o Tip: Using an aftermarket floor jack, instead of the original equipment (OE) jack, can make the job easier and safer. Verify the condition of the floor jack before use.

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Step 3 * Secure the vehicle with jack stands on both sides for safety before starting any work. Do not rely on the jack to hold the vehicle up while working.

Step 4 * Remove the lug nuts. Remove the wheels.
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Step 5 * Remove the brake drum. If necessary, back off the star wheel adjuster.
o Tip: Hit the brake drum with a rubber mallet to break it loose from a rusted hub.

Step 6 * Clean the brake assembly using a“wet wipe method”. This method uses a spray bottle with water and detergent. Do not use compressed air to clean the brakes. Inspect the brake shoes for wear or damage.
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Step 10 * Remove the parking brake lever from the rear brake shoe. Remove the rear brake shoe retainer and remove the rear brake shoe.
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Hope help with this (remember rated and comment this help).

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