Question about 1994 Ford Explorer Limited

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The brake pedel is going all the way to the floor

The brake pedal is going all the way to the floor and making a SSSSSSS like sound. If I pump them they go back to engaging higher but that only last one time then the hissing sounds & pedal goes to the floor again...The car has no problem stopping. This all happend after the parking break light came on but the parking break is not engaged. No fluid is leaking & fluid is full. the pedal even goes down when engine is off.

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  • Tom Hill Dec 11, 2009

    Thank you much for all the info & tips!!

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  • Ford Master
  • 83,096 Answers

You have two problems here, one the Brake Master Cylinder is defective (pedal sinks to floor) and the other the Power Brake Booster is leaking (SSSS like sound), both will need to be replaced.

Here are the general instruction's on how to do this job, it is a 6 on a scale of 1-10 with 10 being the most difficult.
about the booster

The vacuum type brake booster on your vehicle multiplies the force you apply to the brake pedal to slow or stop the car. Engine vacuum acts on a diaphragm inside the booster, pushing a rod into the master cylinder to create the necessary pressure in the brake system. This booster diaphragm may develop punctures and other related mechanical failures after years of service.

Instructions, the booster and the master cylinder can be removed as one unit, make sure to bench blled the master cylinder before installing, the instructions to do this will come with the new master cylinder. Things You'll Need:

  • Nose pliers
  • Ratchet and socket sets
  • Ratchet extension
  • Slip joint pliers
  • Wrench
  • New cotter pin
    Removing the Old Brake Booster
  1. Step 1 Park your car in a safe place with enough room to work around the front and driver side of the vehicle.
  2. Step 2 Locate the booster push rod connected to the brake pedal.
  3. Step 3 Remove the cotter pin securing the booster push rod pin to the brake pedal using a pair of nose pliers.
  4. Step 4 Release the push rod pin from the brake pedal and slide the push rod off the brake pedal.
  5. Step 5 Unscrew the four mounting nuts off the brake booster studs using a ratchet, ratchet extension and socket. You should be able to see the four booster studs extending through the firewall, in front of the brake pedal.
  6. Step 6 Disconnect the vacuum hose from the brake booster, working from the engineThe brake pedel is going all the way to the floor - 2_bing.gif compartment. Use a pair of slip joint pliers.
  7. Step 7 Remove the two nuts holding the brake master cylinder to the brake booster. Use a wrench or ratchet and socket.
  8. Step 8 Separate the brake master cylinder from the booster just enough to make room for booster removal.
  9. Step 9 Pull the brake booster off the firewall and remove it from the vehicle.
    Installing the New Brake Booster
  10. Step 1 Set the new booster in place by sliding the push rod and four mounting studs through the mounting holes on the firewall.
  11. Step 2 Slide the brake master cylinder flange over the two mounting studs on the brake booster.
  12. Step 3 Start the two brake master cylinder mounting nuts by hand to avoid damage to the threads.
  13. Step 4 Tighten the two brake master cylinder mounting nuts using a wrench or ratchet and socket.
  14. Step 5 Connect the vacuum hose to the brake booster.
  15. Step 6 Screw the four mounting nuts to the brake booster working from inside the vehicle. Start the nuts by hand to avoid damaging the threads.
  16. Step 7 Tighten the four mounting nuts using the ratchet, ratchet extension and socket.
  17. Step 8 Position the brake booster push rod over the brake pedal and slide the push rod pin.
  18. Step 9 Install a new cotter pin to secure the booster push rod to the brake pedal.

Posted on Dec 11, 2009

  • Marvin
    Marvin Dec 11, 2009

    here are part numbers and pictures of what u need.

    CARDONE SELECT Brake Master Cylinder

    Part # 132532 {New}
    w/Power Brakes Price: $34.79

    A-1 CARDONE Brake Booster Assembly Part # 5473181 {w/o Master Cylinder; Reman.}

    Pice $55.79


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  • Ford Master
  • 17,970 Answers

It's a possible problem in the Brake Booster vacuum line. Usually on the firewall. If it is in the break booster though the whole thing needs to go - depends on where the leak is.

Hope helped.

Posted on Dec 10, 2009

  • ZJ Limited
    ZJ Limited Dec 10, 2009

    Be careful, if this fails completely your brakes will become very stiff
    and hard to apply. Take it to someone that you trust and have it looked
    at as soon as possible.

    That hissing you hear is that vacuum booster sucking in air from the
    outside to make you power assist work. If you notice brake fluid on the
    booster or dripping inside the truck or under the driver side, check in
    to it, but if your not having any problems don't worry, this sound is
    normal. You should only hear it for 1-2 second while your applying the
    brakes. If you hear in constantly, then the vacuum booster is leaking
    or one of your vent ducts (operated by vacuum) may be leaking.

    Good luck.



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