Our Proflow brake boosters are the perfect addition to your street rod or custom application. The boosters are available in multiple diameters, in universal or direct fit single or dual-diaphragm designs to best fit your application. Available in zinc, black, chrome, and some in stainless steel. 

Single diaphragm boosters are compact for installation under the floor or on firewalls of almost any vehicle. The single diaphragm design is usually used on lighter vehicles. In the heavier applications of 3000-3500 pounds or more, we normally use the dual diaphragm boosters.

You will need full manifold vacuum available to the booster. Manufacturer requirements vary between 18 and 20 inches of vacuum. With radical cams there are many cases where there is a loss of the necessary vacuum and the only option is a 12 volt vacuum pump available from Proflow under part number PFEVP1000.

• O.D. is 8".
• 3/8 x 24 thread pushrod that is 4" long from mount surface to end of the threads (pushrod nut included)
• 4 bolt mount pattern on 3-3/8" centers
• Mount bolts are 5/16 x 20 
• Master cylinder mount studs are 3/8 x 18 and 1-1/16" long and 3-3/8" on center