Question about 1992 Ford F250

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95 F250 Diesel.Vacuum assist Brake Master Cylinder, pedal goes to the floor, only when the engine is running. I've change the MC 5 times in a row. Bench bleed,installed brass plugs,then install on booster while leaving brass plugs in. Eng off/pedal is high and hard. Eng on/idling/ pedal drifts to the floor. No external leaks. please help.

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You may have to bleed your abs sys. this is best done with a computer

Posted on Sep 12, 2009

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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

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

I HAVE A 95 F250 AND THE BRAKE PEDAL GOES TO THE FLOOR. I HAVE REPLACED THE MASTER CYLINDER TWICE AFTER BENCH BLEEDING, REPLACED THE BRAKE BOOSTER . BLED THE SYSTEM 3 TIMES AND THE BRAKE PEDAL STILL GOES...


You need to check wheel cylinders, the only way that the brake peddle will go to the floor like that is if there is a lose of fluid pressure somewhere .

Dec 29, 2010 | Ford F-250 Cars & Trucks

1 Answer

My 2003 Toyota Previa (diesel, with ABS) brake warning light on dashboard lights on after pressing brake pedal a couple of times and when it lights off pedal goes slowly all the way down to the floor. In...


Sounds like there is a fault with the vacuum pump not generating enough vacuum for the brake booster assist, or a leaking vacuum hose. Try pinching off all the vacuum hoses to see if the problem goes away. Could also be a leak in the brake vacuum booster itself

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You changed the master cylinder and vacuum booster and have no leaks anywhere, but did you bleed the entire brake system after you did this work? A little bit of air in any of the lines will make the brakes ineffective.

May 30, 2017 | 1998 Jeep Wrangler

2 Answers

The brake pedal is fine with engine off. When started the pedal drops almost to the floor.Fluid level is fine, I have jacked up all 4 wheels and checked if the brakes are working- they are.....


the master cylinder has a bypassing issue. double check your rear brakes for proper adjustment and if good, replace the master cylinder and bleed the system. happy new year

Dec 31, 2009 | 1994 Honda Accord

1 Answer

When engine is running and you press brake pedal it will have pressure the tavel to the floor. but when you turn off engine pedal is hard.


sounds normal.... when the engine's running, there's power assisting you as you brake to move all that hydraulic fluid from the master cylinder to each of your wheels... when the car's off, there's no power assist as you press on the pedal causing it to feel hard as you have to use your own strength to push on the pedal. also with the car off, the fluid pressure just keeps in the line and is not returning to the master cylinder, causing that pedal to feel harder with every press

Aug 19, 2009 | 1994 Ford F250 Supercab

1 Answer

Brake pedal problem


I'd bet you dollars against donuts that when the new MC was installed it was left with air in the lines. Bleed the brake lines to get that air out of there, and I suspect your brakes will firm up nicely.


Mar 03, 2009 | 2002 GMC Savana

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