[SOLD] power brake booster system a-body

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1968Cudaman

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I have a barley used power brake booster system I bought from Master Power Brakes. The system has a new master cylinder, vacuum booster, mounting bracket and added a vacume pump due to the large cam I am running. This was on my 1968 Plymouth Barracuda. I have removed the system and now use a hydraulic system as I couldn't get the peddle height adjusted right. When the peddle was close the the floor it really stopped. When I raised the peddle to be even with the clutch it was hard.

I paid over $1,000 for the mounting bracket booster, master cylinder and vacuum pump and kit. Will sell for $250 to get it out of my garage.

located in San Jose, CA

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Do you think the issue was the cam size and needing to use the extra vacuum assist? What cam grind were/are you running? What engine displacement? I'm building a 340 for my 67 Barracuda.
 
1badfish67 said:
Do you think the issue was the cam size and needing to use the extra vacuum assist? What cam grind were/are you running? What engine displacement? I'm building a 340 for my 67 Barracuda.
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No the cam has significant lift as well as special rocker arms with added opening. The brakes just about put me through the windshield when they worked. But the only way I got them to work was to have the peddle real close to the floor. This had been the same issue with the original brakes. And another kit I had. Now I am running a hydraulic system and it allows my peddle to be in the right place. I have a drum/drum single master cylinder car with a 225 Slant Six. Though I have it set up with duel carbs, duel headers 10:1 compression

A number of years ago I added disc brakes off a Duster including the booster. That is when my problems started. I believe I had the wrong peddle rod going into the booster.

It is a 8" duel diaphragm booster with a Chevy duel master. I also have a new one off the barracuda I will though in. It is the 4-bolt type. The new master that goes with this is a two bolt.

If you go to master power brakes you can see the kit I have.
 
Thanks for the info. Still interested. I am out of pocket right now. I will PM when I get home to a computer. Phone isn't cooperating very well.
 
I was wondering if a combination of intake/exhaust overlap area and duration may have contributed to the issue. I'm kinda new at all of the terms associated with cam grind and performance but was thinking that lobe area overlap % and duration could have a significant effect on engine vacuum, especially at low rpm. I could be wrong though. Someone else with more experience than me may be able to say.
 
I'm just talking about engine vacuum and having to install the external assist vacuum pump.
 
sorry I have been in the field the a lot lately. I work with the CORPS of Engineers so the heavy rain is keeping us busy.

Ok I have the 4-bolt new master cylinder as well.

You lucked out timing wise. I have had a lot of interest.

I will get it packaged up and out.

Bryan
 
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