My car has a dual diaphragm nine inch brake booster. Itâs pretty much equal to the stock single diaphragm unit when it comes to adding âpowerâ to your brake system.
My camshaft doesnât produce much vacuum so I needed a fix. I would hate having all the extra hoses for a hydro-boost setup so I began studying electric pump systems.
As it turns out, many vehicles today have electric vacuum pumps, GM, Ford, Subaru...theyâre pretty compact and are often used to help a car have better brakes. From what I can tell, almost all of them are supplied by Hella. Ford has theyâre own designs and theyâre pretty poor.
Thereâs four different Hella pumps, small to large. The largest one, the UP5.0 can provide vacuum for a brake system without any engine vacuum and usually come on trucks. This is the same pump thatâs used in the very expensive Master Power Silent Drive vacuum pump.
The Hella UP5.0 is used in some Dodge pickup trucks, part number 68385753AB. Search this number on Ebay and youâll find it for about $65.00.
The pre-made kits like from Master Power, Leed etc. are ready to go with a universal bracket, vacuum switch, relay and check valve. If you want to use the UP5.0 pump on itâs own, youâll need to add these components.
Superior Transmissions makes an adjustable vacuum switch, K058 which is about $44.00 on Amazon. The relay is any standard 12 volt relay and nice aluminum inline vacuum check valves can be had on Ebay in a variety of hose sizes.
The Ebay Dodge pump comes on a bracket with rubbers between the pump and the bracket. Youâll probably make up some sort of bracket but you should still use the rubbers. I made up a bracket and itâs mounted in the fender behind the washer fluid jug, itâs out of sight.
I recommend the largest vacuum reservoir can you can find and fit in the fender-or several of them.
The system works pretty good on my car-and I have a large master cylinder with a 1-5/16" bore to move enough fluid for six piston front & four piston rear calipers. BTW, Iâm thoroughly convinced that the engineers at Wilwood know nothing about brake hydraulics.
Pic is the Hella UP5.0 on the Dodge truck bracket.