Question about 1988 Toyota Pickup

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I blowed a line the other day and fixed it the brakes bled out good then the pedsl just kept gettin lower and lower iv replaced the front and rear brake wheel cylnders the master cylinder the pump up when the truck is off but as soon as i stqared it they fall to the floor iv bled everthing they are to bleed i lost for options im leaning torward the booster but not sure

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A booster cannot cause a low pedal. (unless it is boosting too good...which will put your face through the windshield - LOL!) If you have replaced all that stuff, you probably have lots of air in your lines. Many times, "normal" bleeding will not remove this air. The best way to cure this is to do a "Radical" bleed. You need to start at the right rear wheel. Make sure that your master cylinder is full. Open the bleeder screw at the right rear wheel and pump the pedal about 15 times. DO NOT close the bleeder screw while doing this. Be careful to watch the master cylinder so you do not run it out of fluid. (If you run it out of fluid you will have to start over) Leaving the bleeder open, refill the master cylinder and allow the right rear to gravity bleed (just let it drip) for about 1 minute, then close the bleeder screw. Repeat this process next with the left rear, then the right front, and lastly with the left front. Top-off the master cylinder again and pump the pedal HARD. Then open the bleeder at the right rear and close it again as with "Normal" bleeding. Do this at least twice or until it stops spitting air, whichever comes first. Repeat this process also with the left rear, right front and left front. Top-off the master cylinder ... the problem should be fixed.

Posted on Mar 27, 2011

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Bill:

Check your master cylinder. It could be a piece of junk lodged in the fluid port for the rear brake lines, or in the brake line its self. The fact that both rear wheels spin tells me that if it is a clogged line, it is between the two manifolds, (one next to the master cylinder, and the other where the rear brake line splits into two... one for each rear hub. Or it could be that the piston in the master cylinder needs to be replaced. I would disconnect one brake line at one rear wheel and disconnect the rear brake line at the manifold (near the master cylinder)and blow that line out with air pressure. . do not leave the rear brake line connected to the master cylinder as you blow air through the lines as you may damage the master cylinder piston packings. You'll have to bleed the brakes when you are done.

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Hi, bleeding your rear brakes with engine running, you should get enough pressure out of the lines to squirt 3-4 feet. In other words, good pressure. If all you get is a trickle, you probably have a bad master cylinder. Just because its full of fluid, does not mean the seals arent shot. If you have bled them in order, left rear,right rear,left front,right fornt and have bled them enough to get fresh fluid out of each one without achieving good solid pressure at all wheels, replace your master cylinder. There is a proportioning valve, but usually it will affect only one wheel when going out, usually the left rear.
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