I am trying to help a friend get the breaks to work on his 1967 Jeep. I don't remember the body style. It looks kinda like a smaller wagoneer. It isXXXXX V6. We have replaced the master cylinder and adjusted the plunger but we are still having trouble getting enough pressure to the wheel cylinders to activate the brakes. Is there a trick that we need to know about??
Country: United StatesMake: JeepModel: Not sureYear: 1967Engine: V6
Replaced the master cylinder and tried to bleed the brakes.
Good evening, my name is Walter.
Can you tell me more about the work you performed, like if you've simply replaced the master cylinder, or you've done other work in the process. Also, what prompted you to replace the master?
While you're offline, just to throw a few things at you, have you bench bled the new master cylinder? You could still have air in the system that you won't get out from bleeding the lines at the wheels. This video will give you a quick understanding of that:
Bench bleeding video
Also, do you have the shoes adjusted at the drums? If there's excessive clearance between the shoes and drums, it will take a lot more fluid to cause the shoes to reach, thereby giving you a low pedal.
What kind of fluid volume are you getting when you bleed? Once the air is out, it should be a good stream when you crack the screw. If not, it's possible you simply have a restricted system.
When you can get back with more details about the other work you may have performed, I'd be happy to discuss further.
Full service restoration shop specializing in pre-war, brass era, and full classic, but also up to mid-'60s.
This friend of mine has a during the week job several hours away from this Jeep. We will not be working on it again until this next weekend. I just got involved. I will start by adjusting all the brakes, and then try to bleed them. I am not sure if the master cylinder was bench bled or not, it was already installed when I got involved. The master cylinder was replaced because he could not even get fluid to come out with the brake lines disconnected from the side of the master cylinder. I will let you know if we need further help after I give it a try this weekend. Thanks, Larry
Thanks. I'm happy to follow-up when you know more and until we're able to work through all your problems.