spongey brakes trying to fix?

2003 CHEVROLET S-10
200,000 MILES • V6 • 2WD • AUTOMATIC
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MISPLACED17
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Hello I've been trying to fix my brakes for a while now. While driving home I believed that my brake booster died it became extremely heavy to apply brakes. I have since then replaced a brake booster the master cylinder break. I have flush the brake lines. I pressure flush the brake lines. I replaced the o-ring that attaches to the vacuum hose that goes to the brake booster to the engine. And I still can't get any breaking pressure once I turn on the engine.
Dec 17, 2025 at 12:46 PM
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STRAILER
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Does this truck have ABS? I would check the caliper slides and do a complete brake bleed. Also, did you bleed the master outside of the truck before installation? if not this will be a problem. Please go over this video.

https://www.youtube.com/watch?v=WDxvEQrMkBg

Here is a great guide to help with a low or mussy brake pedal, including checking the caliper slide (important!)

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Please go over these guides and get back to us.
Dec 18, 2025 at 11:55 AM