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post #1 of 13 (permalink) Old 03-20-05, 05:20 PM Thread Starter
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Brake Problem on 1998 Expedition 4X4

Im at a loss. I did a brake job on my expedition but cannot get rid of the soft pedal. Here is what I did.

1) Replaced rear brake pads on both wheels.
2) Replace front brake pads, front calipers, front rotors.
3) Bled brake calipers on all four wheels and filled with new fluid.

Here is the problem.

I experience a hard pedal on the brake system when the car is off. When I turn the car on, I get a very soft pedal which never gets hard. I can stop
somewhat but would not survive a panic stop. I have put about a litre of fluid through the whole system but it just doesnt get any better. Do I have a master cylinder problem now? Or is the master cylinder on the expedition power boosted or vacuum assisted in some way? What baffles me is that when the car is off, the brakes seem great but as soon as you turn on the car, the brakes pedal get soft again.

Please anyone help - I need a beer......................

WAGSY

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post #2 of 13 (permalink) Old 04-26-05, 07:36 PM
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Re: Brake Problem on 1998 Expedition 4X4

Quote:
Originally Posted by wagsy22
Im at a loss. I did a brake job on my expedition but cannot get rid of the soft pedal. Here is what I did.

1) Replaced rear brake pads on both wheels.
2) Replace front brake pads, front calipers, front rotors.
3) Bled brake calipers on all four wheels and filled with new fluid.

Here is the problem.

I experience a hard pedal on the brake system when the car is off. When I turn the car on, I get a very soft pedal which never gets hard. I can stop
somewhat but would not survive a panic stop. I have put about a litre of fluid through the whole system but it just doesnt get any better. Do I have a master cylinder problem now? Or is the master cylinder on the expedition power boosted or vacuum assisted in some way? What baffles me is that when the car is off, the brakes seem great but as soon as you turn on the car, the brakes pedal get soft again.

Please anyone help - I need a beer......................

WAGSY
Hi, I am new and was just reading this message and I am having the exact same problem with my expedition.. did anyone figure out why this was happening on Wagsys brake problem? Thank you, Roni
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post #3 of 13 (permalink) Old 04-26-05, 07:36 PM
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Re: Brake Problem on 1998 Expedition 4X4

Hi, I am new and was just reading this message and I am having the exact same problem with my expedition.. did anyone figure out why this was happening on Wagsys brake problem? Thank you, Roni
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post #4 of 13 (permalink) Old 10-03-06, 10:33 AM
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Re: Brake Problem on 1998 Expedition 4X4

New here as well...and it looks like nobody has an answer!
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post #5 of 13 (permalink) Old 10-04-06, 01:38 PM
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Re: Brake Problem on 1998 Expedition 4X4

Replace the brake booster behind the master cylinder.
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post #6 of 13 (permalink) Old 10-04-06, 03:31 PM
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Re: Brake Problem on 1998 Expedition 4X4

Quote:
Originally Posted by wagsy22
Im at a loss. I did a brake job on my expedition but cannot get rid of the soft pedal. Here is what I did.

1) Replaced rear brake pads on both wheels.
2) Replace front brake pads, front calipers, front rotors.
3) Bled brake calipers on all four wheels and filled with new fluid.

Here is the problem.

I experience a hard pedal on the brake system when the car is off. When I turn the car on, I get a very soft pedal which never gets hard. I can stop
somewhat but would not survive a panic stop. I have put about a litre of fluid through the whole system but it just doesnt get any better. Do I have a master cylinder problem now? Or is the master cylinder on the expedition power boosted or vacuum assisted in some way? What baffles me is that when the car is off, the brakes seem great but as soon as you turn on the car, the brakes pedal get soft again.

Please anyone help - I need a beer......................

WAGSY
Sounds like you have air in the system , can you borrow a power bleeder ?
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post #7 of 13 (permalink) Old 10-22-06, 05:51 PM
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Re: Brake Problem on 1998 Expedition 4X4

MM,

Have you replaced a Brake Booster? I have an '03 4.6, XLT that has off and on pedal problems that feel like the booster may be going out as well as very rough idle when I stop. Sounds like it may be the brake booster, I recently replaced the front oxygen sensors as well.

ziv
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post #8 of 13 (permalink) Old 11-03-06, 12:34 AM
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Re: Brake Problem on 1998 Expedition 4X4

MM,

Just got back from SEMA show and need to fix my 2003 Expedition...can you give any info on brake booster replacement?

Thanks
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post #9 of 13 (permalink) Old 11-03-06, 05:26 PM
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Re: Brake Problem on 1998 Expedition 4X4

They are not that complicated to replace. You do have a repair manual for your car, don't you?
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post #10 of 13 (permalink) Old 11-03-06, 06:44 PM
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Re: Brake Problem on 1998 Expedition 4X4

Quite easy job. Remove the master cylinder without bending the lines too juch, move it aside. Inside the vehicle, remove the stop lamp switch from the brake pedal and the rod comes off the pedal. Remove the four booster bolts under dash and..........BLAMO!
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