Question about 1988 Ford Bronco II

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Brakes became soft and pulsing when depressed went from soft to very soft in 100 miles

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  • wakanasi Sep 30, 2009

    no leaks, reservoir full, no fluid on tires

  • wakanasi Sep 30, 2009

    no leaks, fullreservoir

  • wakanasi Sep 30, 2009

    brakes soft
    pulse when depressed
    no leaks

  • wakanasi Oct 01, 2009

    getting the pedal hard then starting the vehicle resulted in the pedal going down. How far down is acceptable? The pedal goes about 1/2 way down. Does that mean the servo needs to be changed. Where is the servo located and can weekend mechanic change it.

  • wakanasi Oct 05, 2009

    Are you saying, if the pedal gets hard when pumped and soft when started that the servo is ok?

    or Are you saying that this means the servo needs replaced? What makes the decision that it is the

    master cylinder is bad?

  • wakanasi Oct 06, 2009

    I didn't understand whether the solution you offered if the brakes pump up when not started and then becoming soft when started indicated a booster problem or a master cylinder problem. Please advise.

  • wakanasi Oct 06, 2009

    Gingko was very helpful



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If the vehicle is braking regularly , then the brakes servo assistance may be gone.
Try pushing hard the brake pedal five or six times. If the brakes do not get more solid after pumping on the pedal several times, then the brakes servo assistance must be checked.
If it gets solid, try pushing down the pedal all the way through, and while pedal is down start the car.
The pedal should go down more, as the servo kicks in. This sometimes can fix the problem.

If instead the truck is braking all the time, and the pedal stays down, then the brakes are seized. In that case repair is done on the brakes.

Check also the brake fluid level, however if there is a leak or very low fluid , the vehicle braking power will be reduced sensibly.

Posted on Sep 30, 2009

  • Ginko
    Ginko Oct 01, 2009

    It is not the servo, you will probably need to replace the master cylinder.

    Here is the master cylinder this is an upgrade kit, click on the picture:

  • Ginko
    Ginko Oct 05, 2009

    It is not the servo. This truck does suffer from servo problems of this kind. I do not think the 1988 model has factory servo brakes installed.
    It is the master cylinder because when master cylinder valve does not hold pressure you get exaclty the same problem.
    This is also a common problem on this vehicle.


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  • 34 Answers

Look at your brake lines all the way down the car to se if you can find any leaks

Posted on Sep 30, 2009


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Vw golf 2000 the brake pedal is to soft when you apply it and seems like is not going to stop but it does, what is the problem?

Not sure if you have done all this.


Functional test:
1. With the engine stopped, Depress the brake pedal several times, then depress the pedal hard and hold that pressure for 15 seconds. If the pedal sinks, the master cylinder, brake line or a brake caliper is faulty
2. Start the engine with the pedal depressed. If the pedal sinks slightly, the vacuum booster is working. If the pedal height does not vary, the booster or the check valve is faulty

Leak Test:
1. Depress the brake pedal with the engine running then stop the engine. If the pedal height does not vary while depressed for 30 seconds, the vacuum booster is OK. If the pedal rises, the booster is faulty
2. With the engine stopped, depress the brake pedal several times using normal pressure. When the pedal is first depressed, it should be low. On consecutive applications, the pedal height should gradually rise. If the pedal position does not vary, check the booster check valve.

Check valve test:
1. Disconnect the brake booster vacuum hose at the booster.
2. Start the engine and let it idle. There should be a vacuum available. If no vacuum is available, the check valve is not working correctly. Replace the check valve and retest.


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that doesn't make the most of sense. it sounds like the problem is in the brake booster. it is the aid / power assist to the brakes.

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