Question about 1989 Chevrolet Silverado 2500

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Brakes i have replaced every component in my brake system and still have spongy brake pedal. no air in lines. replaced booster, master cylinder, porportional valve, abs hydrolic valve, lines, calipers, and pads. brakes work but are spongy and when you apply them. some pressure is coming back up master cylinder and the pin in porportional valve is pushing out when brakes are applied.

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  • Anonymous Mar 22, 2014

    spongy break pedal need help to find out what the problem

  • Anonymous Mar 28, 2014

    replaced master brake cylinder now the brake light on dash board stays on



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Flexible brake lines are probably balooning out causing pressure not to build up, replace flexible to the calipers.

Posted on Mar 03, 2009


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Hello Patricia,

Have you checked the master brake cylinder reservoir for brake fluid loss?

I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
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The only time I ever had a rear brake problem with a 2500 series Chevrolet was due to seized rear brake caliper guide your calipers are also new that is not your problem.

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Find more information here:

. Hydro Boost Power Assist Systems Operation Diagnosis and Repair

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