Gold Lifetime Member
Join Date: Mar 2013
Location: Savannah, Georgia
Re: My 67 L78 Build
I finally drove the car last night. Maiden voyage up and down the driveway. I even drove it into and parked it in the garage. I have been fighting my brake system for over a week and finally discovered what the issue was.
I read a ton of blogs and picked up a bunch of valuable information. Unfortunately, none of it applied to my issue, but it did help me eliminate possible parts of the brake system from the equation.
I have original power disc brakes with rear drums. All SS new lines, rebuilt master cylinder, brake booster, hold off valve, and proportioning valve. This should have been a piece of cake.
Symptoms: Soft pedal, front disc engage, rears drums that did not engage. But, all lines bled correctly.
I had extras of every component, so I even swapped them out.
Solution: I had the rod at the back of the power brake booster attached to the top hole in the brake pedal. This caused the master cylinder to partially engage. This probably removed most of the pressure to the rear brakes, while still letting them bleed. Once I moved the rod to the lower pedal, it removed the pressure from the master cylinder and all was good in this world!
None of my buddies considered this possibility. They pointed at all the other parts in the system. I am just glad to be past that headache and on to sanding a buffing the paint.
Last edited by Sosh67; Jun 6th, 18 at 09:51 AM.