Question about 2000 Saturn Ls 4dr Sedan

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Brakes sometimes my brake pedal goes to the floor, if I pump it then the brakes come back to be normal is this the master or is it the booster thanks Big daddy don

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Sounds as if you need a master cylinder.

Posted on Sep 16, 2008

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Brakes on 96 cheverolet go to floor on start up


Well it could be the booster but your symptoms don't really match it.
If the booster were leaking vac, the engine should be running faster than normal. And probably rough. And your effort to push on the pedal would be harder without the vac assist.
Usually when the pedal goes to the floor the system is out of fluid or the master cylinder is faulty.

Aug 26, 2012 | Chevrolet Silverado 1500 Cars & Trucks

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Have no brake pressure, pedal goes straight to floor, put on new calipers and pads and bled the lines but I am no better off.


Sounds like a bad brake booster. To test, pump up the brakes with the engine off. While holding the brake pedal down,start the car. The brake pedal should drop a couple of inches and hold. If it doesn't, replace the booster.

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Have a 1993 dodge Caravan SE. Purchased it from a man which converted it from ABS to hydraulics. I didn't know it had brake problems till i got it running. He put on a 3 outlet 2 inlet proportional...


if something goes wrong with abs the brake system it reverts back to standard system!! If you can pump brake pedal up and hold it and start engine and it drops thats normal.You say low pedal if you go 15mph on road and check where pedal is when brakes apply.Power brakes will push aLMost to floor while stopped but while moveing you`ll almost go to slide or will go into slide if pedal is pushed to floor.Get on some gravel at 10 mph and hit brakes to a complete stop get out and check to see if all 4 tires slid or 2 front or only 2 rear. this will get you closer to problem good luck.

Jul 12, 2011 | 1993 Dodge Caravan

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

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99 ford explorer brake pedal goes to floor. Booster or master cyl. ?


Not likely that the booster is an issue. The booster would not be able to overcome the brake fluid compression.
First open and inspect all brakes for leaks, adjustment, etc. Check all brake lines.
So if no leaks, did the fluid go low in the MC? If so, pad consumption would eat more than a MC reservoir of fluid, and not require MC replacement, but rebleeding and top up of fluid. If the pads are worn, and you replace them, often this will expel air back through the MC.

If you determine the MC is faulty, bench bleed the new one before install, or you will have lots of problems getting air out....

Mar 03, 2011 | 1999 Ford Explorer

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

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

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sounds like a bad diaphragm in your brake booster. listen for air while running at booster , disconnect vacuum hose depress pedal if it is good there should be a big difference in pedal

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2003 dodge dakota


check 2 things first one is their is a plastic check valve that is inserted into the booster (under your hood) then goes to a vaccum line ,then to the engine, pull it out of the booster and check the valve it should be L - shaped. it might have a hole in it causing a vaccum leak. be carefull pulling it out not to break it just pull straight out. if that is ok put it back in. then your problem is going to be the brake booster the big black round case. sometimes the diaphram inside the booster rips causing a vaccum leak which causes a hard brake pedal and you have to stand on the pedal to stop. then you will have to repace the whole thing but not the master cylnder unbolt master cylder with the brake lines connected, the lines will give then disconnect brake pedal arm under dash inside of trk their should be 2 nuts or 4 buts under dash on inside of firewall near brake pedal then remove booster pulls out from under hood. there is not much to replacing them.

Sep 24, 2008 | 2003 Dodge Dakota Club Cab

2 Answers

97 ford e350 brake pedal goes to the floor...


are your rear drums set up? why did you bleed the brakes. when only when you installed new pads?

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