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My brake pedal slowly losing pressure goes to the floor and then I have to pump it up again

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  • David Marshall
    David Marshall Apr 12, 2015

    Hi Ron Noel, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?

  • raj somaiya
    raj somaiya Apr 12, 2015

    There are many possibilities that can cause such problems. For step by step troubleshooting click the link below
    Free Car Repair Guidehttp://www.allcarhelp.com/2015/04/free-c...

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If you break fluid level is correct and your break pedal goes down to the floor means that your master cylinder is going bad and you might loose your breaks completely if not checked or replaced. Your breaking system is down to the last O ring inside the master cylinder, once that rubber O rings goes you will not have any breaks at all. Master cylinders have a number of rubber O rings that work like a plunger or piston that produce pressure within the breaking system. When the first one wears down due to age, your pedal begins to loose break pressure and you have to pump your breaks several times to gain breaking. You are now down to the last rubber O ring and a warning that your master cylinder needs to be checked. You can still use your breaks but only for a few days before the other rubber O ring gives out too. Once both O rings give out you completely loose your breaks.

Posted on Apr 12, 2015

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That is a sign of air in the system that can be caused by a couple things ie,brake master kits sucking air,possible brake fluid leak so you must check all wheel cylinders and obvious brake fluid level

Posted on Apr 12, 2015

  • Naiton Apr 12, 2015

    That is a sign of air in the system that can be caused by a couple things ie,brake master kits sucking air,possible brake fluid leak so you must check all wheel cylinders and obvious brake fluid level

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Posted on Jan 02, 2017

  • 9 Answers

SOURCE: brakes

Since there is no loss of fluid we can rule out any leaks. A poor booster would make you apply the brake much harder to stop. So somehow you are not developing the necessary pressure for the brakes to function. The pressure is developed by the master cylinder seals. You can get a rebuild kit or a rebuilt master cylinder but the real pain is bench bleeding the new one. Luck to you.

Posted on Jul 18, 2008

mcalkins3
  • 123 Answers

SOURCE: Clutch pedal goes to the floor, then after pulling it up there is pressure...

There is either air in the system or a leak in the clutch slave cylinder. Check your fluid make sure it is full and the cap is tight.

Posted on Sep 18, 2008

  • 106 Answers

SOURCE: Changed front brake pads. brake pedal goes to floor. no brakes

on the inside of wheel is a small bolt that bleeds the brake you my need a extra hand so some one can pump brakes, start from the back then the front, have person who is helping pump brakes a few times then tell to hold pedal down after confirm the pedal is down brake open the bleeder valve then close when fluid shoots out do this Intel feel brake pedal comes up a little after the one move to next bleeder valve. back to front.driverthen, passenger then move to the front and do same. this may help!!!

Posted on Mar 26, 2009

emissionwiz
  • 75117 Answers

SOURCE: brake pedel pushes to the floor

pump the pedal about 10 times and see if it comes back up, u need to pump the caliper pistons out after a brake job.

Posted on Jun 27, 2009

j_del
  • 1586 Answers

SOURCE: brake pedal goes all the to the floor. can not

Check the reservoir to be sure the fluid is full. If not, top it off and try it again. If there's still trouble building pressure, pump the brakes a bunch of times, and then check around each wheel for fluid on the ground. If you see none, it's possible that you have a break in the line somewhere through the chassis and that the fluid is leaking out inside. If you see no evidence of leakage, and the reservoir is still full, you need a new brake master cylinder - what will have happened is that the diaphragm around the plunger inside the master cylinder (which moves through the cylinder when you push the pedal, and forces fluid out to the wheels) has a hole or tear in it, so instead of pushing the fluid out to the brakes, the plunger simply moves through the fluid. It never builds pressure, and your brakes don't work.

Posted on Dec 22, 2009

Testimonial: "thanks for the info. very helpful. harry Newman"

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1 Answer

Our ABS light stays on constantly .Lose brake pedal occasionly. Replaced brake pads, caliphers, rotors. Still have ABS light on and lose brake partically.


If you have brake fade that is if you hold the brake pedal down and it slowly goes down to the floor you probably need a master cylinder

Mar 15, 2016 | 2004 Ford Explorer Sport Trac

1 Answer

Brake pedal goes to floor after fixing leak in line and bleeding brakes


neither is bad. The proportioning valve is kicked and they can sometimes be a bear to re center. Here's the best way I've had success doing that. Before you try opening up any more bleeder screws you, 1)top off the brake fluid reservoir, 2) slowly pump the brake pedal, not all the way to the floor and without the engine running but with the key on, about 20 to 30 times. After you do that you very quickly hit the brake pedal very hard but not all the way to the floor. The repeated slow pumping of the pedal will very slowly put pressure into the line, even if it's air it will compress a little at a time and when you jab the pedal that one time at the end it will re-center the valve. Now here's the key. If the brake light is on it should shut off when that valve centers itself. That's when you must bleed the air out but whoever you have helping you tell them not to push the pedal all the way to the floor again or the valve will pop again. Open the bleeder to the caliper that had the blown line and then have them push slowly down on the pedal only half way to the floor and then stop pushing and hold position til you tighten the bleed screw. After you close the bleeder screw they can let up and do it again. If he pushes it to the floor and you hear a click that means the valve kicked again and you need to start over. Time consuming, yes but it works. I hope this makes sense. Sometimes it's hard to relay what I do to words on paper,.
Dale

Feb 23, 2015 | Cars & Trucks

2 Answers

I have replaced my brake pads I've bleed my lines several times. The brakes work fine until I hold the brake pedal down, thats when it slowly goes down to the floor in a few seconds and the brak


sounds like the brake master cylinder seals are worn buy a master cylinder kit and get a mechanic to repair it it is a lot cheaper than replacing the whole unit

Feb 27, 2013 | 1995 Honda Passport

1 Answer

1992 F250 460 cid automatic 2w drive 85000 mi. Just replaced my master cylinder, all 4 brakes, and both front rotors. Afterward I blead the brakes and got bubbles out of fluid. Problem is : when not...


There is never a test or reason to pump your brakes

Accomplishes absolutely nothing.

There is no pressure in a braking system at all,
until you SLOWLY apply the brake pedal.

Then less than 1" off movement in the master cyl,
will develop 600 to 1800 lbs at the wheels

Release the brake pedal, the system goes to zero,
IT DOES NOT HOLD ANY PRESSURE

To answer your question

You not suppost to press the pedal hard
The saying goes--you apply the brakes,
not force the pedal arm and pin into the
vacuum booster, as though you want to damage it

When your driving what happens ?
You have higher manifold vacuum and
thus your pedal is normal,why the VACUUM
brake booster

Mar 31, 2011 | 1992 Ford F250

1 Answer

Brake peddle goes all the way to the floor. brake peddle will have pressure when the car is off, but when you turn it on brake peddle loses all pressure. how can i tell if its the master cylinder or the...


first make sure there are no brake fluid leaks, sometimes the steel lines get rotted and start leaking. to test the booster with the engine off pump brake pedal about 10 - 12 times on the last pump hold the brake pedal down and start the car if the booster is good the pedal will drop alittle.

Feb 02, 2011 | 1994 Oldsmobile Cutlass Ciera

1 Answer

I have a 97 jetta and when i try and bleed my brakes i start on the passenger side bleeder valve. and when i start bleeding the brakes i have pressure and the pedal goes to the floor but when i bleed the...


When bleeding you start at the rt rear to left rear to rt front to left front always checking to make sure master stays with fluid, also start by removing one bleeder at a time and make sure the hole is clean and free of dirt brake clean should flow through, do this to all 4, then have someone pump pedal 3 times and hold then open bleeder when you close bleeder tell them pump again three times, do this all around until you have a good pedal, also check for leaks after bleeding, may have bad rusted line or bad master but bleed each wheel good first.dont worry about pedal going to floor everytime, just make sure fluid flows out of all bleeders when bleeding. hope this helps.

Jul 26, 2010 | 1997 Volkswagen Jetta

2 Answers

Brake pedal still goes to floor 2000 GMC Jimmy


It's very possible to be the master cylinder, the o-rings on the piston could be worn, letting the fluid seep back through instead of getting full pressure through the lines. Could also be the brake booster.
Try changing the master cylinder first, which is cheaper and easier, and see if there is a difference, you'll need to bleed the brakes again.
To check the booster,
With the engine off, pump the brakes until the pedal is hard, then hold pressure on the brake pedal and listen for air escaping, or the pedal goes slowly to the floor, Do that after the master cylinder has been changed, at least that will be eliminated.

Sep 15, 2009 | 2000 GMC Jimmy

1 Answer

Brake system or booster


is your pedal hard to push? if so maybe booster. does your pedal slowly drop all the way to the floor? if so definately the master cylinder (leaks internally)

Apr 07, 2009 | 1996 Toyota RAV4

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