Vacum Booster Substitute

62 UNI · Post by **62 UNI** » February 5, 2007, 7:27 am

Anyone..........change the single brake res. for a updated unit?

My Uni has already been changed to front gm style disc set up & factory drum in the rear.......

I picked up a dual master from Wilwood (GM replacement) & would like to also add the power brake vacum booster BUT........ would like to save a bit o space - more so than the GM large styled boosters.......

Anyone use something different?? Will a smaller booster effect the overall brake performance?? Or am I stuck with one of those big monsters?

Any suggestions would be appreciated........

Paul

mikecarson · Post by **mikecarson** » February 5, 2007, 7:56 am

A smaller diameter with dual diaphrams will give the same performance. Not sure I'd go less than 8 inch dual.

62 UNI · Post by **62 UNI** » February 5, 2007, 8:47 am

I'll start looking........

Paul

ELpolacko · Post by **ELpolacko** » February 5, 2007, 12:47 pm

I will add this to your quest.

Aftermarket power boosters are not as sophisitcated as OEM units. The intake valving in them is not as progressive and will allow atmospheric pressure in much more rapidly giving you a relatively small duty cycle.

I use 1985 Ford Ranger power boosters with great success. They are 9" in diameter and are designed to be use with low displacement vacuum of a four cylinder engine.

If diameter is a real disadvantage, may I suggest you pick up a hydroboost from a 70's vintage Oldsmobile Vista Cruiser. Much more compact than standard ones because the accumulator is built into the unit instead of external. And will accept your GM power booster.

mikecarson · Post by **mikecarson** » February 5, 2007, 6:50 pm

I think I'll follow your guidance, ELp. The booster that came with my Crown Vic is HUGE. Been looking for something smaller, myself.