My car only has 14-15" vacuum and the power disc brakes were not stopping the car like it should. I installed a vacuum pump supplied by MasterPowerBrakes. Car now has 26"+ of vacuum and brakes work like a new car. Pump is quiet enough not to hear above sound of running engine and small enough to mount in cavity behind battery. Now I can run a bigger cam and would recommend to anyone.

 

In case "others" in particular new members might not be following along this is on your 1967 Oldsmobile 442 Tripower w/455 auto I assume?

 

That is correct.

 

Carry extra fuses with you for it - a blown fuse may leave you essentially without brakes, without warning.

Happened to me on a Bandit brake pump that I tried out a few years back - great piece, quiet and worked very well for a few weeks.

One day approaching a stop sign, found I had just about no brakes and barely able to stop before blowing into the intersection. I had fuses on hand and that corrected the problem for the ride home, at which point I removed the unit.

 

Does the pump run constantly or on demand?

 

You will still have brakes. You just won't have power assist. Power brakes work when the engine isn't running.

 

Runs on demand