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1938 LaSalle Production - GM Heritage Center

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day practically all car owners recognize the greater<br />

safety and dependability of hydraulic brakes and insist<br />

upon them.<br />

Hydraulic<br />

Brake<br />

Inherent positiveness of the Cadillac braking system<br />

results from an infallible law of physics which says that<br />

pressure exerted upon a liquid within a container will be<br />

distributed equally and undiminished in all directions.<br />

Applying this principle in the Cadillac or <strong>LaSalle</strong> braking<br />

system, pressure is created by the foot on the brake<br />

pedal which controls a piston within a cylinder of fluid.<br />

Double thick steel piping and heavy flexible hose connections<br />

conduct this fluid to two additional pistons in<br />

each wheel brake cylinder, these in turn forcing both<br />

brake shoes simultaneously against the brake drum<br />

retarding the car. Both shoes for all four wheels must<br />

be in contact with their drums before hydraulic pressure<br />

is applied. This prevents pulling or grabbing of an<br />

individual wheel.<br />

Tubing is carried inside the frame side bars to eliminate<br />

any danger from flying stones. A supply tank at<br />

the master cylinder maintains a constant supply of fluid,<br />

regardless of expansion or contraction due to temperature<br />

changes.<br />

Brake drums are of the expensive composite construction,<br />

giving a wear and score resisting, heat radiat-<br />

• 90 •

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