Hydroboost Vs Vacuum Vs Powermaster
I Still Ask The Question; Why Did Buick, Who Installed Millions Of Delco Vacuum Boosters On Standard Regals (at About $12.00 Per Unit Cost) Chose Not To Install The Same Vacuum Booster On Their Pride And Joy Grand Nationals? Vacuum Boosters Are Cheaper, But Not Better. Vacum Booster Need Vacuum To Work, And They Are All Rated To Produce Their Needed Output At 20" Of Vacuum. All Vacuum Boosters. The Vacuum Booster Is Connected To The Manifold Hose. The Object Of The Turbo Charging Is To Produce Manifold ***pressure***. This Is The Opposite Of Vacuum! Pressurizing A Vacuum Booster Is Not A Good Idea, And Buick Knew That. Assuming The Vacuum Hose, Under Pressure Does Not Blow Off, (which Has Happened Here) Then The Check Valve Itself Could Blow Apart, Or Blow The Valve Into The Vacuum Booster. The Volume Of Square Inches Of Area Inside The Vacuum Booster Is More Than Enough To Blow It Apart At The Crimps. Any Of These Will Lead To Catastropic Brake Failure! Buick Knew This. They Built The 83-85 T Types With The Bendix Hydroboost. No One On This Forum That Owns One Of Those Cars Complains About The Brakes! Buick Decided To Try The Much More Expensive Delco "powermaster" Unit, 12v Operated, Still No Vacuum On Their Turbocharged Cars. They Knew Better, And They Look At Everthing From A Liability Standpoint. How Will They Be Sued? This Car Was Meant To Perform, And It Is Also Very Heavy For A Race Car. (grand National Events) A Vacuum Booster Under Manifold Pressure Can Not Work. The Hydroboost Is Now Produced By Bosch, And It Just Works. As The Rpm's Come Up, So Does The P/s Pump Speed. It Holds The Hydroboost Even Harder. Guys Are Reporting 22lbs Of Manifold Pressure With Their Foot On The Brake! 22 Lbs Of Pressure Into A Vacuum Chamber Will Blow It Apart. Kind Of Like Sticking A Shop Air Blow Gun Into Your Vacuum Booster, Try It. Oh, By The Way, Checking A Vacuum Booster In The Released Position Means Nothing. The Diaphargms And Center Seals Can Still Be Bad, And Usually Are, And Will Only Leak In The Applied Position, When You Need It. It's Your Car, And Your Life, (maybe Others) Use The Best Products You Can Buy.