Question about 1979 Pontiac Firebird

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Brakes are spongy and need to be pumped at times. Master cylinder resevoirs are full and there are no apparent leaks. Master cylinder?

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You may need to strip out all the brake calibres if there sezed up this will give you a springy pedel or you may just have air in the lines

Posted on Aug 07, 2010


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All of a sudden i have spongy brakes on my 92 f 250. changed master cyl and booster. and rubber brake hoses. still spongy and nothing is leaking.brakes went from being good to spongy in one...

Check the rear wheel cylinders? Was anything leaking at the master cylinder? Does it have ABS?
Check the front caliper slides are free. Check the front caliper pistons for leaks as well. This is all assuming you bled the brakes(all 4 wheels) properly after all that replacement! You're getting air from somewhere for sure or if it has ABS, the pump may have a problem.

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The front/driver's side of my van is leaking brake fluid very fast.

sounds like a broken brake line or a brake master cylinder problem. the master cylinder has a resevoir ontop were you add brake fluid. Does your brake pedal feel spongy? if so sounds like your master cylinder needs to be replaced.

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Warning light consisting of just the word "BRAKE" and no picture--what does it mean?

find a good straight away and hammer the brakes. if brakes feel solid. check you brake fluid level at brake master cylinder engine bay, drivers side firewall. if fluid level is ok unplug the level sender at master cylinder resevoir-if this resets the light it is the switch in the master cylinder. If not unplug the switch attached to the e-brake lever.
if the brake feel spongy or fluid is low check for a leak in the hydraulic system.

Dec 15, 2010 | 2000 Chevrolet Malibu

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I am having an issue where the brake pedal goes all the way to the floor before it will work. From what I understand it may be the brake master cylinder malfunctioning. I am considering replacing it...

Check the vacuum booster first
Shut the car off after it idles for 3 minutes
Apply your foot on the brake and hold
If the pedal seems hard at first and did not go down all the way keep your foot on it for two more minutes
If the pedal gradually goes down to the floor the brake booster is leaking
If not start the car and let idle again
\With the car still idling step on the brake pedal again and hold
If the pedal goes to the floor in a second the master is shot instead

Jun 22, 2010 | 1986 Toyota Camry

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Breaks all new from whells to firewall ,,,all bled an no brake after starting

check master cylinder but after brakes are bled with vehicle running brake pedal pushed down should be even with gas pedal you have to allow extra movement due to vacuum assist you only have this when vehicle is running pedal is only hard when engine is off

Aug 18, 2009 | 1984 Jeep CJ7

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Spongy brakes

Does sound like you need a new master cylinder. On a 2000 you wont need to back bleed. You will just need to follow the instruction and bleed the master and all four points. you will probably need to bleed the ABS block and proportioning valve but only if they have bleeders on them.

May 31, 2009 | 2000 Ford Explorer

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Changed caliper on 2005 ford freestar and now brakes are spongie.

Use a vacuum pump brake bleeder starting at the furthest point from the master cylinder. They cost abt $35. Be sure to keep master cylinder full... :)

Apr 11, 2009 | 2005 Ford Freestar

4 Answers

Brakes spongy and fading


Since your brake fluid level has not gone down, leaking calipers or hoses, letting air into the system can be eliminated.
Suggest you run engine, and sit with your foot on the brake pedal quite hard, and see if it drops drastically.
If so, this points conclusively to the brake master cylinder, and being a 2001 model, is a distinct possibility.

By the way, as you have dual system braking, you should never loose your brakes completely, nor the pedal reach fully to the floor.

The other possibility is excessive play, in one of your front hub wheel bearings, allowing the brake pads to be pushed back on cornering, then on first application of the brakes, you will have to pump the pedal.

Hope I have been of some help.

Good Luck !

Please don´t forget to give me a FixYa rating thanks !


Jan 26, 2009 | 2001 Jaguar XJ8

1 Answer

Brake pedal trouble

have the brakes bleed first and if that does not take care of the problem have the master cylinder checked because the check valve in the master cylinder could be bad

Jan 18, 2009 | 2003 Kia Spectra

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