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The parking brake is a brake system used to hold one or more brakes
continuously in applied position. The parking brake employs the
regular drum brakes on the rear wheel. Instead of hydraulic pressure,
however, a simple mechanical linkage is used to engage the brake
shoes. When the parking-brake pedal is depressed (or, in some cars, a
hand lever is raised), a steel cable pulls taut a tension lever;
other cables draw the brake shoes firmly against the drums. The
release knob slackens the cables and disengages the brake shoes. The
parking brake is self adjusting. An automatic adjuster in the piston
moves on the thrust screw to compensate for lining wear.
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