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GMC Yukon 1999 5.7l...
 
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GMC Yukon 1999 5.7l vortec brake peddle issue

  

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how’s it going Scotty I have a problem ware I have to keep pumping the brake peddle to harden up to stop my truck I’ve done the brake lines no leaks at all front brakes are brand new wit rotors brake pads and lines I’ve done the brake bleed all for wheels did my abs auto brake bleed my rear brake drums have new hardware new brake cylinders from acdelco what do you recommend me doing 


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Well assuming that ABS brakes have been bled correctly with a scan tool it sounds like you didn't touch the master cylinder (25-year-old original?) and that may have an internal leak. You could also check brake hoses for ballooning under pressure.


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