Hi Chevy Dudes. I have a 1969 El Camino with front disc brakes already installed. I am having trouble bleeding the back brakes on it. I just put in a new master cylinder (Yes I bench bled it) and rebuilt both back brakes with new springs, wheel cylinders and shoes. I can seem to get any fluid to the back. When I open the rear bleeders (while my wife's foot in on the pedal) nothing comes out on either side. I took the line for the rear brakes off the master cylinder and blew compressed air through it. It spewed fluid out of both sides. Not clogged like I thought. I hooked everything back up and still can't get any fluid to come out of the back bleeders. What it wrong with my car??? I think I have a small leaky line at the proportioning valve. Would that cause this? Any help is greatly appreciated. ????

Gravity bleed them, twice.

There's a pushbutton on the back of the distribution block attached to the booster, right below the master cylinder on my '70.

I needed to use wood shims to keep that button pushed in to allow the brakes to gravity bleed - I think it was for the backs, but I'm not 100% on it.

on my '67, I also had trouble getting fluid to the rears. I disconnected the lines at the T on the rear differential and let it gravity-feed. this made it easier to then bleed at the cylinders.

Ok, I'm a big dummy. What is gravity bleeding and how do I do it? Please give me a step by step process. Thanks.

Gravity bleeding is just opening the bleeder valve at each wheel and letting it drain out on it's own. No vacuum pump, no pushing the brakes - just let it slowly drain.

Start with the wheel farthest from the master cylinder and work your way up.

Personally, I like slowly having someone slowly push the pedal.