Power brakes operate in the same manner as
conventional Buick hydraulic brakes, except that about a third of the
effort required to apply the brakes is furnished by the power cylinder. In
addition to the reduced effort required, the travel of the brake pedal is
reduced by about one third.
The source of power to operate power brakes is furnished
by the normal vacuum which is present in the intake manifold of the
engine. A vacuum reservoir is provided in the pipe line from the power
cylinder to the engine manifold. This tank insures instant response of the
power cylinder when the brake pedal is depressed and also stores sufficient
vacuum for 2 or 3 power stops after the engine stops.
After the supply of vacuum in the reservoir has been
expended, the brakes will function unassisted by power but will require
higher pressure of the foot on the pedal.
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