Hydroboost Conversion
HI Mr Awash. As you know high vacuum is hard to get on a small turbocharged motor. The only time there is enough, is with a closed throttle, and downshifting. Buick decided not to install the Regal vacuum booster on the G.N. because of that reason. There have been some guys here that have tried it, with problems at high boost of blowing off the vacuum hose, or blowing the check valve apart. Then they waste $400.00 on an electric vacuum pump, that is noisy, and still doen't have the volume needed to operate the booster in traffic. That is why Buick used the electric powermaster. No vacuum. The problem with those is the electric pump. it has plastic vanes in it. Brake fluid is not a lubricant, and the vanes wear out quickly. This over works the pump. The other problem with all of those pumps is the seal between the pump and the windings. When the seal leaks fluid into the windings, it shorts out the fuse and the pump. Those pumps are sealed, and not rebuildable. Buick quit building the A body cars in 87, and only used the Powermaster in 86-87. They did not really want to deal with the P/M anymore, and discontinued it. The Regal vac booster, with low vacuum, delivers about 800psi out to the brakes. The Hydroboost can deliver up to 2000psi to the brakes, at idle p/s pump speed. They run off of the P/S pump pressure, and thus, no vacuum needed for the booster. As the engine speeds up, so does the p/s pump. This holds the Hydroboost on even harder. You can spool those turbos up, some guys here say to 22lbs with your foot on the brake. The car's stopping ability is completely different at speeds over 100. It stops as if you are doing 50. It's a completely different feel of confidence. You can plant the car into a high speed turn, and know exactly how it will feel. The hydroboost, with occasional clean fluid, can last up to 200,000 miles, and is rebuildable. Another advantage is the master is inexpensive, and easily replaceable. The P/M does not separate. The part number for the Hydroboost, master, and bracket is 2772-211, Specify if it is the original pedal, or the vacuum pedal. The hydroboost uses the same pedal as the P/M, but we have a bracket for the other pedal. Same as the Monte Carlo. There are two hose sets, One has all stainless pressure, and returns, or stainless pressure, with rubber returns.