Question about 1989 Ford Bronco II

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Ford Bronco II spongy brake pedal

My brakes were working fine until the rear steel brake line developed a leak. After replacing the line and bleeding the brakes several times, the pedal became spongy with the engine running and would not generate enough pressure to open one of the four rear brake shoes. Same reult after installing new wheel cylinders. Same reult after rebuilding master cylinder. When engine is not running, the pedal is firm. As soon as the engine is started, the pedal is spongy.

If the problem is the booster, is there any way to verify the problem before purchasing a replacement booster?

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  • hmagpie Dec 14, 2008

    Thanks for your response. The pedal is hard when the engine is not running. When the engine runs (and therefore the booster is active) the pedal gets exremely spongy. The rear shoes have been properly adjusted.

  • Anonymous Mar 12, 2014

    ford e250 van with brake pedal fade,has new master cylinder and booster

  • Anonymous Mar 22, 2014

    I have a bad leak in the brake line just behind the front driver side tire, when I fill the reservoir up it runs right back out. I can't see exactly where the leak is because it's up behind the frame where the line continues up into the engine to the master cylinder. Thanks, sweetptyre0@yahoo.com

  • Anonymous Mar 25, 2014

    I have never had this problem before the new brake booster was installed.

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  • 303 Answers

If the booster is bad the pedal would be hard sounds like the e-brake is stuck take off the drums and make sure the arms are all the way back then did you adjust the rear brakes after changing the shoes

Posted on Dec 14, 2008

  • yes but is the e brake lever stuck forward

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