Oakley Vest

I believe it has traditional vacuum break assist. Yes, I have tried bleeding while truck was running, and doing that didn’t build up any pressure at all. Yes it did empty the master cylinder. And yes warning lights have always been on since I bought the truck but they never caused any problems before this. Thank you I will try that.

Yes already did that. Bleeding while truck isn’t running restores the breaks. But when so start it up all the pressure goes away.

So I just installed a Rough country 6 inch lift on my 03 Silverado 1500. I unhooked all the break lines at the calipers to do the lift. When I got everything put back together it was time to bleed the breaks. When I tried they pumped up like normal but after starting up the truck the pedal then sank to the floor. I’ve done this a good 10 times to no avail. My abs lights are on in the cab as well as service break system, but all these lights where still on before I lifted my truck. I even changed out the master cylinder an tried to run the codes on my scanner. But it said that I had to clear trouble codes before I could do the automated bleed. But It won’t let me clear the codes anyway. I do have breaks but there almost absolute. Is there a way to bypass abs so I can have breaks again? I’m lost!