Question about 1996 Toyota 4Runner
Brakes problem 1996 Toyota 4Runner 6 cyl Four Wheel Drive Automatic 230000 miles
After having the right front caliper fail by locking up and burn the breaks I desided to changd all the breaks and cilipers and turn the roters on the truck. After installing all the new parts every thing seemed to be working good for a short while. Then the breaks seemed to start applying themselves again, this time on the drivers front. I thought possibly we got a bad caliper and changed the front calipers to an up graded napa part caliper. I also changed the worn out break pads that were totaly gone in under 300 miles. This kept happening on both sides of the front. So from the original repaire we have changed the calipers twice on one side, 3 times on the other side, break pads twice and the problem seems to persist. The breaks will seem to engage randomly and will stop the truck. This seems to happen more at low speeds (35 mph). The breaks have also been blead throughly every time parts were changed. The truck was then taken to a small local mechanic who looked it over for two days trying to figure out what the problem was, He couldn't. He checked the break installation, blead them again and took the master cylinder apart and cleaned it and put it back together again. When the breaks are all locked up he also disconected the master from the power boost and the breaks were still locked. They would stay locked until the bleed valve on the caliper was opened and the preasure was reliesed. Then the breaks would relax.
I dont want to just start replacing pricey parts to see if it will fix the problems. When a master cylinder goes bad it will have some bleed off of the pedal when the breaks are pushed and slowly sink to the floor. This dose not happen. Is it possible for the master cylinder push rod to get stuck in? It seemed to move easily when it was apart. And I dont know anything about the ABS system other than it would cost more to fix than the truck is worth, so I hope that will have nothing to do with it. Pleas help I an at my wits end with this break issue that should have been an easy fix.
Thank you Greg.
When you said, the bleed valve had to be loosed before the caliper would release, (caliper is already replaced), then we know there was a lot of preasure in the braking lines backed up some where,
and every time the brakes are applied to compress the the caliper to stop your truck,
the preasure would not release,
Is a clear indication that the Flexible Rubber Brake Hose attached to the caliper is backed up, clogged, kinked, etc..
That would be the next item in the brake system to check.
Its Bottom Up Disagnostics...
When the hose is off try to slide a strong piece of wire (metal clothes hanger) through the hose..
Replace Rubber Brake Line's, on both sides.
I reccomend Stainless Steel Braided Brake Line.
Here is a video that kinda shows corrosion in a rubber hose.
Also check out other videos on youtube.
Posted on Feb 27, 2017
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Posted on Jan 02, 2017
The brake fluid level sensor in the master cylinder is stuck in the lower position which completes the circuit to illuminate the light.. Try tapping lightly on the side of the reservoir to loosen it. If that does not help, you will need to replace the level sensor.
Thanks for choosing FixYa for assistance.
Posted on Jan 25, 2009
well from reading of your problem, i am going to say its the calipers again, witch it could very well be, but there is something else it could be, There is a rubber break hoses that come from the hard line to caliper, there like a two way street fluid runs to caliper and back thru same hose, if there is a restriction or if it got kinked at one time it won't let fluid run back to resavor hence breaks don't release all the way and rub rotors and wear out pads. now calipers will do same thing. most of the time if there used and you squees the piston back in, when they come back out, like when you step on the break they will stick and not release or at least all the way and wear pads out prematurly. so my advise to you is this, new break hoses, new calipers and i think it will fix your problem. Hope this will help. OLD.SCHOOL.
Posted on Jan 29, 2009
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