I have replaced left front caliper, installed new master cylinder ,installed new power booster, and replaced all the brake pads, when not running the brake pedal is pretty stiff when I start the truck up the pedal seems to be soft and then gets hard towards the end and that's when the brakes barely stop the vehicle I have to push hard don't know what else to do. would the ABS might cause the problem I have no brake or abs warning lights


It sounds as though the entire system may not be bled properly. The vacuum booster is fighting with the spongy feel of trapped air.

I would start with a thorough bleed, including the ABS activation (which always seems important on Chevys) and see if the problem changes.

  • I will bleed brakes again ,what are you meaning by activation of Abs are talking about scan tool, I do not have that particular tool on hand, any other suggestion besides the bleeding or do i need to have the Abs done with scan tool Jan 29 '19 at 8:47
  • the abs system can trap air in it or the pipes and bleeding the system properly is the only way to get the air out.
    – Solar Mike
    Jan 29 '19 at 8:49
  • You can get at least some of the air of the ABS by making a few panic stops on a soft surface like grass or loose gravel. The idea is to get the ABS to activate. This doesn't remove the air but may move it towards a wheel. Then rebleed the brakes. The best option if this doesn't work is to have it towed to a shop and have it power bled.
    – mikes
    Jan 29 '19 at 9:40

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