Not enough vacuum.

[68_sixpeashooter]

So I finally got my mustang back on the road! It's been about 1 year and a half but it's drive able now! I redid all 4 corners of the suspension, overhauled the motor and now I have the front disc conversion as well. I took it for a test drive the other day and man the pedal feels pretty hard. Once I built up speed and I'm running from 30 mph and up the brakes feel good but when I'm coming to almost a complete stop the pedal gets hard as a rock and I almost feel like I'm not going to stop on time. I called my mechanic and he suggested that I get an electric vacuum pump so I can finally have power brakes. Has anyone here had to install an electric vacuum pump with disc brakes before? If so are they really good or do they fail more often than not? I've heard mixed reviews about them on different forums but I haven't read about a six cylinder with one. Btw I'm running a classic inlines cam 264/274 with a 110 L/C, D8 head with a 2 barrel autolite 2100, and duraspark ignition. I haven't measured vacuum since I don't have a vacuum gauge but I'm just curious to know if anybody here has had a similar experience and what did you do to fix it.

Thanks,

 

[bubba22349]

A power booster would help on pedal pressure. There is also a couple other ways to do the same thing with out the power booster unit and that is to use a master cylinder with a different piston size and or to modify the brake pedal ratio. Check the below link for info on that. Good luck

http://www.onallcylinders.com/2014/08/0 ... bore-size/

 

[wsa111]

First of all you need to get your distributor recurved & calibrated properly for your engine combination.
You should have chosen the 112 L/C camshaft with the C-4 trans. A looser converter would help your idle condition.
I don't believe a vacuum reserve tank or a vacuum pump is necessary at all.
You just need mainly the distributor work & a looser converter would be a plus.
I can take care of the distributor for you. Just PM me or email me. Bill