crownvic96
Member
- Joined
- Jan 31, 2005
if you're really worried about losing vacuum you can get vacuum cannisters from summit racing from 33-86 bucks. problem solved
Originally posted by POWERBRAKEBOB
HI MR 440. WE RECENTLY BUILT A HYDROBOOST SYSTEM FOR CHRYSLER FOR THEIR NEW 540 ALUM HEMI THAT THEY INSTALLED IN A 71 PURPLE CHALLENGER THAT WAS FEATURED AT THE DETROIT AUTO SHOW. OUR HYDROBOOST CLEARED THE MASSIVE HEMI,WHICH HAD DUAL THROTTLE BODIES AND APPROX 900 HP. THIS ENGINE HAS VERY LITTLE VACUUM. THE HYDROBOOST WAS ABLE TO FIT NEXT TO THE ENGINE AND PROVIDED THE 2000PSI TO THE WILWOOD CALIPERS. WE WOULD LIKE TO EMAIL YOU SOME PHOTOS OF THIS BEAUTIFUL CAR.
Originally posted by POWERBRAKEBOB
ANOTHER CHALLENGE? NO PROBLEM. AS WE KNOW, THE 83 -85 T TYPES CAME WITH HYDROBOOSTS. I HAVE NOT SEEN ANYONE ON THIS SITE COMPLAIN THAT THEY DON'T WORK. BUICK DECIDED THAT SUPERCHARGING A VACUUM POWER BRAKE WAS NOT A GREAT IDEA. THE HOSE BLOWS OFF (DOCUMENTED HERE 4 TIMES), THE CHECK VALVE HAS A LITTLE RUBBER FLAP TO BLOCK MANIFOLD PRESSURE, WHICH CAN BE FORCED INTO THE BOOSTER, AND THE CAP ON THE CHECK VALVE IS ONLY HELD WITH A DAB OF GLUE. IT NORMALLY IS UNDER VACUUM. YES, IT CAN BLOW OFF. BUICK USED FIRST THE H/B, AND THEN THE POWERMASTER. NO T/R'S CAME WITH VACUUM.THE HYDROBOOSTS WE USE ACTUALLY HAVE A LARGER POWER PISTON INTERNALLY FOR EVEN MORE POWER THAN THE 83-85 UNITS. THEY CAN STOP 14,000LB TRUCKS, USING UP TO A 1.625" PISTON IN THE MASTER. WE USE A 1.125" MASTER. IT DOESN'T EVEN LOAD THE H/B TO PUSH THIS SMALL SIZE MASTER. WE BUILT THE BRAKE SYSTEM FOR BULGARI'S GN WHEN IT HAD 14 MILES ON IT. THE GOAL WAS TO HAVE A 200MPH POTENTIAL CAR TO BE SHIPPED TO EUROPE. DUTTWEILER WAS COMMSIONED TO BUILD THE ENGINE, ART CARR BUILT THE TRANS, GULDSTRAND DID THE SUSPENSION, POWER BRAKE SERVICE DESIGNED THE BRAKES FOR THE 200MPH GOAL. THIS WAS IN 1987. WE USED THE B BODY FRONT BRAKES, EL DORADO REAR BRAKES, AND A HYDROBOOST. EVERYONE WAS PLEASED. SINCE THEN, WE HAVE REBUILT AND MODIFIED MANY P/M'S. WE DISASSEMBLED THE CRIMPED MOTOR/PUMP, AND FOUND THE VANES WERE PHENOLIC. PUMPING BRAKE FLUID WITH PLASTIC VANES AT HIGH PRESSURE IS NOT A GREAT IDEA, AS BRAKE FLUID HAS LITTLE LUBRICITY. THE VANES WERE NOT AVAILABLE, EVEN IF WE COULD RECRIMP THE PUMP. YES, THERE IS LIABILITY IF THE PUMP FAILS. THESE 12V PUMPS ARE NOW 20 YEARS OLD. IS ANYONE HERE OFFERING LIABILITY INSURANCE TO THE MEMBERS OF THIS SITE IF THEIR VACUUM BRAKE CONVERSION (NOT RECOMMENDED BY BUICK) FAILS? I HAVEN'T SEEN IT. WE PERFORMED SEVERAL VACUUM POWER BRAKE CONVERSIONS IN OUR OWN SHOP, ADDING VACUUM TANKS, AND VAC PUMPS. THE CUSTOMERS WERE NEVER REALLY SATISFIED. IT WORKED O.K. TO DRIVE TO WORK, BUT THAT WAS IT. ABSOLUTELY NO ONE HAS RETURNED A HYDROBOOST TO US, CLAIMING IT WOULD NOT WORK. THAT OFFER IS OUT THERE, THOUGH. IF ANYONE TRIES OUR NEW BOSCH/BENDIX HYDROBOOST UNITS AND DOES NOT FEEL IT IS THE BEST BRAKE SYSTEM OUT THERE, WE WILL ACCEPT THE RETURN FOR A FULL REFUND. (IF IT IS UNDAMAGED) NO PROBLEM. DESIGN BRAKE SYSTEMS? YES I DO.
Originally posted by POWERBRAKEBOB
ANOTHER CHALLENGE? NO PROBLEM.
Originally posted by POWERBRAKEBOB
WE HAVE A POWER BRAKE TEST BENCH, AND HAVE TESTED ALL THESE SYSTEMS. THE HYDROBOOST WINS.
Originally posted by POWERBRAKEBOB
And Bruce, you did not tell us the name of your company? What do you do?
Originally posted by POWERBRAKEBOB
1) Still on failed brakes?
2) Usually brakes fail from improper servicing.
3) The only time to modify the brakes is when you have exceeded the O.E. parameters, or in the case of Lincoln LS's, Turbo coupe T Birds, and Buick Grand Nationals, their 80's design electric/hydraulic brake pumps wear out.
4) All of the examples you have given, and someone's book you referred to, concern drag race cars, not even related to G.N.'s.
5) I would guess that 95% of G.N.'s on this site are street cars, driven by street drivers.
6) To realistically drive this type of high performance STREET CAR everyday, in traffic, (in California it is a chariot race to work everyday) you need immediate brake response. Just driving to work does not heat up the rotors red hot, as in a road race. The rotors are relatively cool on the freeways. (That's why there are holes in the wheels, to spin air around the rotors)
7) IF a G.N. won't stop like you want down at the first stop sign in the morning, cold, then it has nothing to do with rotor heat.
8) The booster is what applies the pressure to the brakes. You say that Buick did not know how to match the brakes on the G.N.?
9) Call them, and ask why. They used the Powermaster from the factory for a reason, instead of vacuum, because they knew the liability of blowing the hose off the check valve, and that may have happened to them at the test track.
10) They test this stuff before they sell it to the public. GM only looks at things as to how they will be sued for brake failures. They elected not to install a standard Regal booster and pedal in a heavy car with this potential for speed. In 1986, a vacuum booster only cost GM $15.00 from Delco. Why didn't they use it?