page was created in reference to my Jet 007 Omni conversion. My Civic
EV was factory equipped with power brakes, so I simply added a GM pump
as described below. Unfortunately, after about two years the pump
died. Since then, every replacement pump I have been able to find
in salvage yards has been dead. The sad truth is the pumps are just
about impossible to find in working condition anymore. I ordered
a rebuilt one from an auto parts store, and when it arrived it had been
damaged in shipping. It turned out to be the last one they had in
the system. No more were available. Since then I have fitted
the Civic with a Thomas pump and switch as is used on most conversions.
These are available from many EV parts suppliers. See http://maeaa.org/links.html#EV
My car was not originally equipped with power brakes, as most modern cars are. I wanted that feature (3400+ pounds is hard to stop), so I installed a power brake booster and the matching brake pedal. Since power brakes require a source of engine vacuum, and electric motors have no vacuum source, another method had to be found.
I was told by an EVer in Michigan to locate an electric vacuum pump from a Chevrolet Cavalier Cadet. It seems GM had a problem in the early 80s with the J-body cars equipped with the 1.8L engine. They didn't produce enough engine vacuum at idle to maintain the power brakes. What GM came up with was a 12 volt automatic vacuum pump. This was exactly what I needed for my car. I later found the same pump on an '87 Volvo sedan.
At my favorite self serve salvage yard I found an '84 Cadet. The vacuum pump was mounted inside the driver's side front fender in front of the wheel, inside a black plastic shield. The easy way to find it was follow the vacuum hose from the booster down the fender and to the pump. The pump was made to hang under a horizontal surface. The connections were very simple, just three wires:
The pump will produce 22 inches of vacuum. It automatically cycles on when the vacuum drops to 12 inches. It takes mine 11 seconds to pull the vacuum back down to 22 inches. I don't use a vacuum tank, it doesn't seem to need one.