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Brake pedal very soft and mushy. Brake warning light comes on and stays on. Is this a master cyclinder failure?

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  • Geo Master
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YEP MASTER CYLINDER FAULTY. ALSO LOOK FOR A LEAKING BRAKES LINES, LEAKING BRAKE CALIPERS OR WHEEL CYLINDERS IF YOU FIND DRY MASTER CYLINDER.

Posted on Jan 07, 2011

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Posted on Jan 02, 2017

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Brake and e brake warning lights stay on happen when i blew a brake line.


If brakes are mushy then you still have air in the lines.Did you bleed all 4 wheels?have wife push brake pedal down once and hold then bleed hold down one and bleed and so on if this has a quick takeup master cylinder pumping 3 or 4 times then bleed wont work

Jun 14, 2012 | Chevrolet Cars & Trucks

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Brakes are out. Master looks ok. Can't find lines under engine to follow. no cheater book to ckeck with.


Master cyclinders never look OK. You have to fill em full of brake fluild ( all the way to the top) and pump the breaks lots and hard. recheck the fluild and if it went down look under the truck to see where it's coming out. If you can't find it look in the floor under the break pedal where the pedal rod goes though the floor. Fluild coming out here is a bad master cyclinder, if no leak is found put in still more fluild and pump till you find wher it's runnung out. if the fliuld stays full and the pedal goes all the way down the master is bad. Masters fail alot on older Isuzu trucks.

Jun 24, 2011 | 1994 Isuzu Trooper

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Brake light stays on in dash 96 ford thunderbird


Hi, there are 3 things that can cause the light to stay on.
One is the parking brake switch, which may have shorted internally or to chassis ground. The switch is above the parking brake pedal. If the connector is still on the switch remove it. If the light goes out, replace the switch.

The second is the fluid level in the master cylinder reservoir. Check fluid level. If good, check the sensor by taking the cable off. If that puts the light out, replace the sensor.

The third is the pressure differential warning switch. The switch turns on when there is a brake failure. You would probably know if this happened. If not, check all wheels for brake fluid leaks. If you have a leak and need help with repair procedures, please get back to me. If you have completed repairs, please read the procedures below from autozone.com to reset the warning switch.

Please let me know if you have any questions and thanks for using FixYa.


From autozone.com:
A pressure differential warning valve is incorporated in the hydraulic system. The signal from this valve consists of a warning light on the dashboard activated by a differential pressure switch located below the master cylinder. The signal indicates a hydraulic pressure differential between the front and rear brakes of 80-150 psi, and should warn the driver that a hydraulic failure has occurred.
After repairing and bleeding any part of the hydraulic system the warning light may remain on due to the pressure differential valve remaining in the off-center position. To centralize the valve a pressure difference must be created in the opposite branch of the hydraulic system that was repaired or bled last.
Front wheel balancing of cars equipped with disc brakes may also cause a pressure differential in the front branch of the system.


VALVE CENTERING PROCEDURE

  1. Turn the ignition to either the ACC or ON position.
  2. Check the fluid level in the master cylinder reservoirs. Fill to within 1 / 4 in. (6mm) of the top if necessary.
  3. Depress the brake pedal firmly. The valve will centralize itself causing the brake warning light to go out.
  4. Turn the ignition off.
  5. Prior to driving the vehicle, check the operation of the brakes and obtain a firm pedal.

Dec 24, 2010 | Ford Thunderbird Cars & Trucks

1 Answer

Hello, I have an 89 ford bronco II with a 2.9


Could be that you have one or more brake lines rotting internally and plugging the line. Check for a soft spot in the brake lines.

Jul 04, 2010 | 1989 Ford Ranger

3 Answers

Mushy powerless brakes . changed pads,rotors,powersteering pump.


Mushy brakes are almost always 1 of 2 things:
  1. Air in the brake line; when brakes where changed they weren't bled; this would cause a soft brake pedal.
  2. Most common reason for a soft pedal is a bad master cylinder. Once they become faulty they fail to provide the pressure required to adequately stop the vehicle.
Either way, have this checked out at a brake shop immediately. A soft brake pedal is not something to be fooled with.

Nov 05, 2009 | 2002 Chevrolet Silverado 2500HD

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Why is the "brake" icon illumiated in my 96 Camaro?


is it the "red" brake warning light? if so, its possible the master cylinder may have an internal leak causing the pedal to be soft. if this is correct you'll need to replace the master cylinder.
If this is the "yellow" brake warning light it the ABS system (anti-lock brake system) you'll need to have a professional inspect this.

Nov 02, 2009 | 1996 Chevrolet Camaro

1 Answer

ABS and Brake light stay on plus pedal is soft after tight turn


sounds like you have low brake fluid pressure and the pressure sensor is turning on warning lights saying there is low pressure and also pedal going to floor indicate this, sounds like master brake cylinder is worn out/broke and needs replace ment

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Brake pedal goes down while sitting at light


bad wheel cyclinders, or master cyclinder, possiable fluid leak

Apr 29, 2009 | 1997 GMC Jimmy

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NO brakes


U have air in the system, u need to use a pressure bleeder.

Mar 25, 2009 | 1994 Jeep Grand Cherokee

1 Answer

The abs and emergency warning light comes on and off at the same time, is this a sensor, electric, or just a brake issue ?


the red brake warning light will usually indicate low brake pressure,abs light can come on also,check fluid level,does brake pedal become soft and spongy?if so it can be the brakes master cylinder,if fluid level is low,can be a damaged brake line,inspect brake system,

Mar 12, 2009 | 2001 Chevrolet Suburban

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