The Stovebolt Site Forums The Parking Lot '60-'66 Trucks 66 chevy truck booster /brake help

Installed a booster and cylinder re-ran new lines, the front brakes bleed fine but the back ones barley have fluid that runs out when i bleed em. Is this because the back are still drums using shoes and the lines are smaller or something else. I put rotors on the front and have no problem with fluid flowing to these. I also installed a proportion valve. I used all the parts from a 87 truck, the booster is working i tested it and the lines are ran to the correct parts of the master cylinder. thanks in advance.

Is the prop valve new or used? Sometimes they stick & don't flow fluid.

The same one that was off the 87 so pretty used. I get some fluid but not much.

That's prolly your problem, its 20 yrs old.

My luck, thanks.

Sometimes you can free them up by gently tapping on the side of the housing witha ball peed hammer, or alternitavle, open up a bleeder and have a helper give the pedal a good solid kick. I've used both tricks and they do work. Unless the valve is totally corroded shut, then you'll need a replacement.

I'm not sure when they stopped using them, but there's a prop valve that will slide to one side and cut off the fluid in case of a major leak. It always wreaks havoc with people when they try to bleed one end of the vehicle. Look at the valve and see if it has what looks like a button on the end of it. If it does, it will need to be re-centered for fluid to pass through.
Scott

48bigtrucks that is what i was going to try next i just found that out. I hope that is it. Thanks i will give it a shot and let you guys know , thanks for the help.

After you center the piston in the proportioning valve, open the bleeder screw on one of the rear brakes and let it gravity bleed. It will take a couple of minutes, when some fluid comes out close it and then do the other side. This gets fluid in the lines and won't cause the valve to shut off when you bleed the system.
Fred

I removed the boot on the valve, the pin was in so i taped it with a hammer and the pin came out. Afterwards i was able to get fluid to all wheels but the back right. The back right came out but not like all other 3, i think it may just be a clogged bleeder going to keep trying it, thanks for all your help.

Best wishes for a speedy recovery.

Tony

Got it working, thanks guys. I took the boot of the valve and tapped it with a philips and a hammer and the valve came out and the rears started working.