Question about 1994 Ford Explorer Limited

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Brakes losing pressure

Fluid level is good, sounds like a vacuum leak

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  • Robert Lewis
    Robert Lewis Mar 20, 2014

    I'll vote for the Master Cylinder. After installing new pads, shoes, hoses, clips and all, I ended up replacing the Master Cylinder and that totally cured the problem.

  • Robert Lewis
    Robert Lewis Mar 20, 2014

    Mine is a 1994 XLT, by the way.

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  • Expert
  • 173 Answers

If you don't have leaks is the master cylinder

Posted on Mar 21, 2014

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Posted on Jan 02, 2017

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  • 321 Answers

SOURCE: 96 Taurus brakes

Presuming you have NO leaks in the hydraulic system,it would be a bad brake master cylinder.What's happening is,the piston inside the master cylinder has rubber seals,and when the pedal goes to the floor,the master cylinder is leaking internally,past the rubber seals.If the brake booster was bad,the symptom would be an extrememly HARD,unresponsive,brake pedal,and the engine would idle terrible (vacuum leak).Good luck.

Posted on Jul 10, 2008

justuscc
  • 360 Answers

SOURCE: how to find where the brake line is leaking from

sounds like a rear wheel cylinder

Posted on Oct 15, 2008

  • 508 Answers

SOURCE: 1992 F250 intermitton lose of power brakes while driving

Are you sure that your truck does not use a hydrovac unit rather than a traditional power brake booster unit? The hydrovac unit runs off a pump hydraulically. These go out and cause you to loose the power brake effect. They are very expensive to replace. You would be looking at about $450.00 to replace.

Posted on Mar 16, 2009

  • 33 Answers

SOURCE: abs rear light stays on

The sensor is located I believe on the differential housing,could be faulty or corroded

Posted on Jul 12, 2009

  • 135 Answers

SOURCE: loss of brake pedal pressure, hissing sound when

if the pedal is hard to push like a manual brakes on an old truck I would say the power brake booster is going out

Posted on Aug 05, 2009

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1 Answer

Hydraulic brakes stoped working after blown steering seel? Need help


If there's no pressure on your brake pedal it's due to a failure somewhere in the braking system. I can't see any connection between a steering problem and a braking problem.

Most cars have a split-circuit braking system. That is, the front left wheel is on the same line as the rear right wheel. The front right wheel is on the same line as the rear left wheel.

This is just a safety feature: If one brake line loses pressure, the other line still works and you retain 50% of your braking power.

check the level of your brake fluid. If the level has dropped it indicates a leak somewhere. Though be aware that it is possible NOT to lose brake fluid whilst having soft brakes..

Brake pressure is lost due to either a faulty brake master cylinder or a leak at one of the wheels.

Remove each tyre in turn and inspect the piston on the brake calliper. If there's slight wetness caused by brake fluid that indicates a seal (around the brake piston) has failed and is drawing in air.

There's no need to replace a calliper - overhaul kits are available.

The link below shows generic images of brake calliper pistons/seals:
brake calliper piston Google Search

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Hard brake pedal


Check The Hose Leading To The Brake Booster For A Leak. If Good Check The Check Valve To Make Sure It Working (Sucking In Air) If Good The Brake Booster Needs Replacement.

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Losing brake fluid but no sign of leak


It is fair to assume that is what is happening. There should be a drain hole between the m/cyl and the booster to allow the fluid to leak out . If there isn't remove the vacuum line to the booster and check for oil or wetness in the hose.. Check you rubber flexible lines for a leak under pressure as if it is leaking there the fluid will be squirting out without hitting anything thereby leaving no indicators.

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Vacum leak on vacum booster for brakes


check vacuum hose first and make sure it's seated properly and not leaking.
This vacuum hose, if leaking, will cause engine to run rough or die.

If you are leaking fluid, the problem is most likely the master cylinder leaking.

If the booster itself is bad, it is a very hard job to swap it out as the mounting bolts are far behind your gauges on the firewall.

I hope you have a good booster.

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Check the fluid level. Low brake fluid level can cause the brake light to come on warning you of low fluid. It will be off when the car is level, but as you hit bumps and hit your brakes, the fluid that is in there will slosh around indicatind low fluid. Don't overfill and only use DoT 3 brake fluid. Do not substitute anything else.

Aug 15, 2012 | 1999 Oldsmobile Alero

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I just had the brakes done on my 92 firebird about 5 months ago now my brake light came on yesterday and I have to push the brake to the floor to stop. Whats wrong with it?


either fluid level is low or you need to check the sensor located in the master cylinder. Master cylinder can also be bad.

Apr 05, 2011 | 1992 Pontiac Firebird

1 Answer

I have a '95 Oldsmobile ninety-eight and when i first try to slow down the brakes work fine, but right when i'm about stopped the pedal seems to lose resistance and then it seems to freeze up. i don't want...


It sounds like there may be air in the brake system. First thing to do is check the brake fluid level in the master cylinder reservoir, if it is low, check the entire system for a leak. You may have to remove the wheels to check for leaks at the wheel cylinders and calipers. Even if you don't find a leak, I would go ahead and bleed the brake system. If bleeding the system doesn't help, the problem could be with the master cylinder or power brake booster. Make sure the large diameter vacuum hose going to the brake booster is in good shape and fits tight at both ends. A vacuum leak could cause a hard pedal.

Feb 14, 2011 | 1995 Oldsmobile Ninety Eight

1 Answer

When I turn off my 2001 Camry I can hear what sounds like a high-pitched whistling that lasts for about 15 seconds and it appears to be coming from the brake booster.Brake fluid levels were fine and I...


It probably is from the brake booster. The booster uses engine vacuum to assist in braking. It's either a vacuum hose leaking, or possibly the diaphragm in the booster itself. Apparently, the leak is small right now and is not affecting performance (engine vacuum is sufficient to make up for the leak), but eventually the leak may become large enough to lose the assist. Check the large hose that runs from the intake manifold to the booster for any weathering/cracks, and replace it if there is any doubt. If that is not the problem, you will probably have to replace the booster.

Jan 26, 2010 | Toyota Camry Cars & Trucks

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Install new brake pads and rotors all 4 wheels. Replaced front 2 calipers. Bled brakes. New clean fluid coming out. pedal is still soft and goes to floor. 200 Seebring.


Are you losing any Brake Fluid? Is it visible anywhere at the four wheels? Is it visible anywhere else?
The Master Cylinder may be defective. When you bled the Brakes did you maintain proper Brake Fluid Level in the Master Cylinder? If you didn't: and air entered into the Master Cylinder there maybe air within in the system in the Master Cylinder. You can bleed the Master Cylinder by removing the brake lines, adding more fluid, pumping the brakes, bleeding the air out of the system.
Are you losing Brake Fluid and can't find a noticeable leak? Then there is a good posibility that the rear seal in the Master Cylinder is leaking and the Fluid is going into the Brake Booster - which is the large wheel shaped drum located on the fire wall. In this case both the Brake Booster and the Master Cylinder will have to be removed and replaced. The Booster contains seals that Brake Fluid is very caustic to and will ruin these seals- causing future failures.
If no Brake Fluid is lost, no leak found: Check the Brake Booster Vacuum Advance. This should be connected to the outside of the Booster, attached to a hose, with the hose going to the engine. Check to see if this is working properly. Replace if needed.

Dec 31, 2009 | 2002 Chrysler Sebring

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After replacing master cylinder, right rear wheel cylinder, vacuum booster and bleeding system forever RR,LF,LR,RF i get good pedal, then i crank the engine and lose all pedal what is wrong?


check for leaks sounds like when pressure goes up u are loosing fluid some where, also check vacuum line to booster hope this helps

Jul 07, 2009 | 1993 Saturn SL1

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