Hello, I am after a bit of help please. I have recently rebuilt the brakes on my 6400 chevrolet, the four wheel cylinders at the back were overhauled as was the front. I also had the master cylinder overhauled. The hydrovac was also checked and cleaned. The problem i have is when i brake the brakes work very well but they pressure up and dont let off the pressure, all the springs are ok. If you crack a bleed nipple this releases the pressure.I have checked the rubber hoses all are ok. I even removed the hydrovac and stripped and cleaned again.Any help would be appreciated. The truck is a 52 model.
Last edited by Howardwade; 05/06/2018 5:11 AM.
