Question about 1991 Toyota 4Runner

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91 Toyota 4Runner.Little to no brakes. I have changed the calipers, brake pads, master cylender, brake vacuum booster and still the brake goes to the floor. Any ideas? I am not heading in the direction of the abs relay.

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  • Toyota Master
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You may have a bubble in the ABS. You can try bleeding there by loosening the lines one at a time, like bleeders. I have read that you might need a special rig to bleed some ABS systems. :-(

Posted on Sep 13, 2010

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I have a low brake pedal on 2003 toyota 4runner


Did you also change the brake pads? Add fluid to top of reservoir?

Was the brake pedal low before you changed the calipers or is this something that developed after you worked on the car? If it was there before the caliper change then it has nada to do with the work you did.

U might have a bad master cylinder.

Nov 12, 2015 | 2003 Toyota 4Runner

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87 toyota clutch wont engage after brakes were replaced


Brake and clutch are vacumme assisted and hard to start seems like vac hose left of of has leak

Nov 14, 2012 | Toyota Cars & Trucks

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I am working on a 1993 f-350 with a 7.3 diesel the truck came to me with the brake pedal going to the floor... the customer had already put 3 new master cylenders on it along with a new brake booster......


I would ask where you got the master cylinders from. Were they new, or rebuilt? If the front brake pads look good and no apparent problems from the calipers, it can only be 2 problems. First, is there a leak somewhere in the system. If you have confirmed that there is none, then the master cylinder is 'bleeding' from front to back. Air wouldn't be a problem as you seem to have bled the brakes well, but the only sure way to know is using a bleeder. They run from a simple hand vacuum device to an air powered device which forces brake fluid thru the system.
Since your 'customer' replaced the booster, make sure the plunger rod is set correctly. Perhaps it is not set at the correct length, in which case you will never get a pedal. Diagnosis for this is a pressure tester to see if any pressure is being generated by the calipers.
Good luck. Hope this helps.

Sep 22, 2011 | 1993 Ford F350

1 Answer

My brake pedal is hard after replacing the front pads. 1990 4runner


Hard how?

You machined or replaced the rotors
You removed all rust on hub & rotor mounting surfaces
You removed all rust from caliper & pad sliding surfaces
& lubed with anti-seize
You flushed all four corners (every 2 years) brake fluid
You bought the best pads out there (raybestos,wagner,etc)
You have no vacuum leaks at the booster & pedal holds until
the engine is started?

Sep 22, 2011 | 1995 Toyota 4Runner

4 Answers

Brake pedal goes nearly to floor front pads, calipers, brake hoses changed, rotors turned Master cylinder changed, brake booster check valve changed rear brakes checked, drums good no ridge, shoe's...


I would go with not bled correctly

The booster should hold up with a hard pedal until
you start the engine, then vacuum causes it to move
down when pressing on the brake

Sep 16, 2011 | Saturn SC Cars & Trucks

1 Answer

Brake problem hard to press on 1995 toyota 4 runner. replaced calipers and pads rotors and bleed the lines three times. Is it the master cylinder or power booster


When you expeirience a hard brke pedal the first thing to diagnose is a bad or inop power brake booster. First thing to check is the vacume check valve on the booster housing that is connected to a vacmue hose. Be sure you do have vacume from the hose first before replacing check valve.

Aug 27, 2011 | 1995 Toyota 4Runner

2 Answers

Brakes were okay in the morning, then almost none in the evening. Engages all the way down at the floor. No visible leaks, full of fluid. Rotors, pads and calipers replaced about 12000 miles ago.


Check the lines on your vacuum booster. The vacuum booster helps in the braking process by pulling on the piston of the master cylinder, it makes the braking process about 3X easier. It could be a bad vacuum booster, or maybe a bad hose going to, or coming from it. I hope this helps.

Dec 11, 2010 | Toyota Camry Cars & Trucks

1 Answer

Replced front brake pads and calipers adjusted


Bleed the master cylinder first. You have to do that before you belled any calipers or wheel cylinder.

Feb 22, 2009 | 1994 Toyota 4Runner

2 Answers

2002 Toyota Sequoia power brake booster % master cylinder are bad


Mr. Clark:
It would be extraordinary for a technician to recommend a booster and a master cylinder with no previous mention from you of a possible problem in this area. In other words, the technician had no business looking at the m/cyl or the booster, unless you told him that your braking was deficient.
Here is what REALLY happened: Somewhere, I'd bet, your brake light came on, and somebody "topped off" the master cylinder, to shut the light off. Now, please understand that the brake fluid level in the master cylinder reservoir DROPS PROPORTIONALLY to the wear of the brake pads. When the tech replaced the front brake pads, he obviously had to squeeze the caliper pistons into the housings to allow the insertion of the new pads. This action forced the brake fluid from the now-compressed caliper pistons BACK into the master cylinder, and it sprayed out from under the cap, coating the cylinder and the booster. Tell that repair service that you do NOT need a booster and a master cylinder, THEY caused the problem with the fluid being everywhere. I am confident that I just saved you a significent amount of money that you do NOT need to spend. Have a great day.

Dec 29, 2008 | 2002 Toyota Sequoia

1 Answer

Toyota 4runner brake


Did you replace these all by yourself or have them installed ?
Brake master cylinder has to be bench bled and the entire system has to be bled when installed. Or there will never be any brakes. If this is not the problem I need more information in order to diagnose correctly.

Jul 17, 2008 | 1988 Toyota 4Runner

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