I recently put a GM vacume pump off a Caddy on my Chevelle.
I started out with just the pump attached to the booster, not going to the motor.
I had "Great brakes" after doing that.
Then I hooked up a vacume switch from SSB to shut the pump on/off, so it would not run as much.(hit the brakes and it runs anyway)
So then I decided to hook up my Summit vacume can for more volume so the pump wouldnt run as much?
Didnt change anything that I can tell?
I still havent hooked up to the motor because I am not sure how a one way valve would work with the pump?
I would think the pump would pull the valve closed, if not it would be evacuating the motor?
Would the vacume from the motor overpower the pump if you have a low vac. situation as I do? (7"@idle)
I realize the motor will cruise at 15", but by that time the pump will have caught up I think?

Any advice or comments are welcome, just thought I would pass along how my expierence with a vac. pump is going, it shure is nice to have "really good" brakes.
T.C.

Hey how and where did you mount your pump ???

Accually I mounted it on top of my vac, can.
I made a bracket that wraped around the motor with a tab off the bottom that bolts to the same place my vac. can bolts go through.
As to where I mounted it , it's inside the left front fender, on top of the fender well, kinda behind the window washer bottle.
I could take a pic. if ya want?
T.C.

A pic would be great !!! E-mail it to me.... ratchevychevelle@sbcglobal.net THANKS !!!