Question about 1999 Ford Expedition

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My 99 expidition had an issue withthe brake pedal staying hard but not stopping. after replacing the power booster it now rumbles and drops to the floor intermittently.

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Bleed your brakes before you replace the master cylinder

Posted on Sep 30, 2009

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Sounds like your master cylinder just went.

Posted on Sep 26, 2009

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4 Answers

Why is it hard to push on the brakes


The most obvious cause for a hard pedal is simply not enough vacuum. Check the brake power booster by pumping on the brake pedal while the car isn't running. Continue pumping until you've "bled off" the vacuum from the booster. Hold the pedal down while you start the car. The pedal should go down a bit more beneath your foot. If it doesn't, then you should examine the connection between the vacuum hose of the brake power and the engine's vacuum.
Replace the brake power booster if the connection's fine, which would fix the hard brake pedal problem.

It may be your calipers need replaced. Check them for signs of wear. Look at the metal spring where the brake pads sit.
Apply tension to the pad and see whether you hear a pop. If you do, the brake pad is moving too much on the bracket. Replace the caliper. This could help the hard brake pedal.

Jul 09, 2014 | 2000 Isuzu Rodeo

2 Answers

Power brakes stopped working


Brake booster vacuum hose , inspect that, if the hose is good then brake booster has went bad.e1320de5-8a99-48ed-84e9-c42d2e2274cb.jpg

Dec 10, 2013 | 1997 Ford Taurus

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Isuzu trooper diesel piping diagram


when your brakes get hard 99 % of the time it is the brake booster if they get soft or spongy it the master cylinder

Aug 15, 2013 | Cars & Trucks

1 Answer

Dodge ram brake power booster


only way i know to test a booster, is to turn engine off. use brakes several times till pedal is hard. then with brake applied,start engine. the brake pedal should then soften.if the pedal stays hard the booster is bad


Read more: http://wiki.answers.com/Q/What_are_symptoms_of_a_bad_power_brake_booster#ixzz2487DHV5I

Aug 20, 2012 | Dodge Ram 1500 Cars & Trucks

1 Answer

What is the sympton for bad break booster.i am confused--will the brake pedal be hard to push down or way to easy to push to floor. i have hissing sound in warm weather near brake pedal but not in cold...


Hello rickyjkoch: My name is Roger and I will help with your question. With the engine off, press the brake pedal down several times. Hold the pedal down and start the engine. The brake pedal should drop 1 1/2 to 2 1/2 inches toward the floor. If the pedal stays up and does not drop the booster has a problem. However if you hear a hissing sound from the dash area of the brake pedal the booster should be replaced. Should you need further help please just ask. Please rate the answer. Thank You for using Fix Ya. Roger

Jul 30, 2011 | 2005 Ford Escape

1 Answer

1999 Buick Century Custom _ Brake Problem My 99 Century has little to no assist and it makes an air hissing sound when depressing the brake pedal. I think that this means that I have a faulty brake...


nope you have to replace them.when brake booster diaphram leaks you cant plug them.i have bought one at salvage yard in good shape.until i got a new one.get your brake booster from inside salvage yard where they stock them inside out the weather.dont take any brake booster off old outside cars been in all kinds bad weather. there vacuum diaphram probably dried up will leak also.

Jun 11, 2011 | 1999 Buick Century

3 Answers

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

3 Answers

Brake pedal is hard and vehicle is hard to stop, what could be the problem?


servo assist could be faulty
best way to check is
push pedal a few times with engine stopped
press down on brake pedal ,and at the same time start engine
the pedal should travel down more if your servo is working properly

Mar 03, 2011 | 2002 GMC Sonoma Extended Cab

2 Answers

Engine rumbles hard


Sounds like it maybe a vaccum leak because when you apply the brake you brake booster uses vaccum to assist in braking so maybe theres not enough vaccum (air) going into the engine so its causing it to stall. Thats just a guess

Aug 31, 2009 | 1999 Mitsubishi Galant

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