84-85 Trucks & 4Runners 2nd gen pickups and 1st gen 4Runners with solid front axles

85 4runner brake problem question ?

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Old 02-11-2011, 06:27 AM
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85 4runner brake problem question ?

My brakes work great until Tuesday? All of a sudden it seems only the rear brakes are working, or they are working more than the front ?

Any thoughts what to check this weekend ?

Thanks mike

Oh

1985 4runner 4” lift all else is stock. Besides the tires.

also the pedal seems spungy.
Old 02-11-2011, 06:38 AM
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Master cylinder would be my guess. Upgrade to a 1" master and maybe a dual diaphragm booster from a v6 truck. Does not have to be from a v6 truck though, but when looking for parts at a parts store, it's just makes it easier. I have a master from a t-100 in mine. Cheap at autozone new and comes with the reservoir. Although the 1" AISIN master are the best to use.
Old 02-11-2011, 06:49 AM
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Originally Posted by xxxtreme22r
Master cylinder would be my guess. Upgrade to a 1" master and maybe a dual diaphragm booster from a v6 truck. Does not have to be from a v6 truck though, but when looking for parts at a parts store, it's just makes it easier. I have a master from a t-100 in mine. Cheap at autozone new and comes with the reservoir. Although the 1" AISIN master are the best to use.

please explain Upgrade to a 1" ?
Old 02-11-2011, 06:53 AM
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Aisin 1" bore

Last edited by rworegon; 08-03-2014 at 01:11 PM.
Old 02-11-2011, 07:02 AM
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all you need to know about a booster and master upgrade:

http://home.4x4wire.com/erik/4runner/brakes/
Old 02-11-2011, 08:27 AM
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any brake fluid leaks?

did the pedal fall to the floor?

Bleed the brakes, or just throw parts at it
Old 02-11-2011, 08:33 AM
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No leaks, pedal does not go to the floor
Old 02-11-2011, 08:45 AM
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any difference if you pump the brakes?

no leaks the prop valve, LPSV...
Old 02-11-2011, 08:56 AM
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nope no leaks. if i pump it the back lock up faster?
Old 02-11-2011, 09:10 AM
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no, but if your losing pressure from a bad MC pumping the brakes can help..
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