im still having trouble with my brakes im about to give up I have bleed the brakes 4-5 times I know there is no air in the lines I also took the master cylinder back off the car and bench bleed it and I still have a hard pedal. I bought a vacuum canister and that was no help same problem. so now im thinking that the power booster is to small. ill try and upload a pic of the booster to let anyone know what kind of setup I have. if anyone can help me with some info on this it sure would ease my brain im about to pull my hair out over this. oh yea does anyone know of any power brake booster and master cylinder that would bolt up without much work.off of a nother car .
What is that master and PB from? It looks aftermarket as heck. What did it do without the PB? I'm doing a disc conversion on my '59 and I'm using manual brakes.
Don't know if you already tested the booster, but if not, I believe you pump the brakes a few times with the engine off, hold the pedal down, and start the engine. If the pedal goes down more, the booster works. Maybe yours is just broken?
I wouldn't think the booster is too small as it is a dual diaphragm unit,we have had members in the past with issues when they had single units.The unit you have looks similar to a CPP try going through this checklist and let us know what you find. http://www.cl***icperform.com/TechBook/BrakeTroubleshoot.htm
Ok here it goes I did all the check list in the brake troubleshooting but no help so I went and installed a proportioning valve and still no help even changed the booster and master cylinder and the back wheel cylinders and I still have a hard pedal it will stop but it don't feel like power brakes I also checked the vacuum I have 18-20lbs of vacuum. all help is appreciated. I don't know what else to do but set it on fire and forget about it.
Proportioning valves wont be a factor. Brakes will work with or without them. Are the 2 parts( master cylinder and Booster) compatible with each other? Is the MC a Drum/Drum or Disc/Drum or Disc/Disc. Do you still have all drums on the car.
yes the parts are compatible and I have disk brakes on the front drums on the back. heres a pick of the booster and master cylinder is a 7in booster
Check the part# on that MC. Make sure it's a Disc/Drum unit. Bore size in MC can be a big problem if it does not match your set up. Read this article real quick. http://www.motor.com/article.asp?article_ID=1969
It's my understanding a disc/drum setup requires a residual valve on the rear drums....not sure that has anything to do with a hard pedal though. Is your pedal/push rod adjusted correctly? There should be a small amount of play in the rod before it engages.
Yeah, my thoughts exactly. Something is fishy about the master cylinder and booster combo. Some of off alignment on push rod between MC and Booster. Man, It's tough trying to trouble shoot this stuff without being there.
I don't think its a residual valve issue, I'm also going with a mis-match between the master, PB. The master itself... maker sure its for a disc/drum application. This is why I always try to use something I know, like a Ford master from a Mustang or Fairlane.
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