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Old 03-01-2008, 07:31 PM
POWERBRAKEBOB POWERBRAKEBOB is offline
 
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Default Re: The Final Word on front disc brakes

Interesting to see that all those High Perf calipers always show less stopping power over stock. The real problem with the g.N. is that weak Powermaster booster system. Now, after 20 years the electric motor pumps are all failing. Those pumps had to use phenolic vanes inside to be able to run without galling, since brake fluid is not a high pressure lubricant. The other problem with the pumps, is when the seal leaks between the pump and the windings. When the elec. side fills with brake fluid, it shorts out. Buick never used the standard Regal vacuum booster on their supercharged cars. Vacuum boosters need vacuum, (20") and a 231 ci. motor with a turbo, cruising along in overdrive, has very little. The G.N. is a heavy fast car, and was built when G.M. was downsizing cars. They used all S10 brakes on the fast car. Not good. We have been converting the Powermasters to brand new Hydroboost units. They bolt right on, and use the same pedal as the powermaster. We use stainless braided hose to connect to hte pump, and box. The master is replaceable, easily, and we them in aluminum. Guys are reporting being able to hold up to 22lbs of boost, with their foot on the brake. The car stops like any new car, at any speed, with less rotor heat. Hydroboosts run off of the p/s pump, and need no vacuum, and no electricity. They can last up to 200,000 miles with just an occasional p/s fluid replacement.
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