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#876456 - 05/29/11 09:42 PM Dual Diaphram vs Single Diaphragm brake booster
Greasy Offline

Registered: 10/16/10
Posts: 158
Loc: san antonio tx
My brake booster went out, and now its time to replace it! So from my google searching I can't find whether or not it is preferable to have a dual diaphragm booster. I still have my stock brakes, disk up front (which will eventually get better rotors) and drum in the rear. The cost difference really isn't that much, what do you all think? Will I benefit from a dual? Should I keep it single?
1984 Monte SS 383 stroker
World Sportsman II heads, 200cc intake 64cc chambers 2.02/1.60 valves
Comp Cams Xtreme Energy XR276HR roller cam 276/282 duration .502/.510 max lift
Weiand Street Warrior intake
Holley 750cfm vac secondaries

#876473 - 05/29/11 11:35 PM Re: Dual Diaphram vs Single Diaphragm brake booster [Re: Greasy]
Gruvin Offline
10+ Year


Registered: 08/05/01
Posts: 14858
Loc: Texas
dual is always a good upgrade if you need to replace the old one
My first SS! Sold Jan 2004

87 SS bought 9-5-04: Sold 6-18-2010 - project 87 finds a new home with another undisclosed member!

#876474 - 05/29/11 11:36 PM Re: Dual Diaphram vs Single Diaphragm brake booster [Re: Greasy]
71BLACKSS454 Offline

Registered: 12/20/06
Posts: 268
Loc: KENOSHA WI. 53140
The dual 8 inch will only be a little better at best, if you want to upgrade swap in a hydro boost unit.

Found this in a search.

Originally Posted by POWERBRAKEBOB
The Problems With The "wonder Booster", The 8" Dual, Is That It Is Measured At The O.d. Of The Crimp. The Rear Dia Actually Is 7" Dia, And The Front Dia. Is Actually 5.5". The Inside Hub That Supports The Dias. Is A Larger Than Most Hubs, And Further Reduces The Dia. Area. If You Have Normal Vacuum, This Booster With A 1.125" Master Will Push The Pressure Guage Only To 850 Psi. Disc Brakes Like 1200psi And Over. The Popular 7" Single Dia Will Only Reach 450psi. We Like The Hydroboost System, Because It Can Deliver Up To 2000psi, With A Normal To Great Pedal Feel. They Can Be Bolted Directly To The Firewall, And Eliminate The Bracket Extensions. Almost Any Master Can Be Used. On Frame Mounted Brake Boosters, They Are Flat Underneath, And The Big Exhaust Pipe Can Be Run Alongside, As The H/b Is Oil Cooled. They Also Can Clear Those Huge 572 Motors, Hemi's, And Others With Tall Valve Covers. Vacuum Is Not An Issue, As It Receives It's Pressure From The P/s Pump. Any Cam Can Be Run, Any 4 Disc Combo Can Be Used, And They Can Stop 1000hp Cars. "" Has Many Photos Of Installations, Featuring New Hydroboosts. If You Do Shop Junkyards For Used, They Can Rebuild Them, And Provide Stainless Hose Sets To Hook Them Up. They Can Fit Camaro, Chevelle, Mustangs, Street Rods, Jeeps, And Trucks.

Edited by 71BLACKSS454 (05/29/11 11:37 PM)

One owner 1983 MC 40,000 miles. Our very first new car.
Third owner 1971 SS454 Monte Carlo, one of 1919 built.
2014 Silverado High Country 6.2
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