Generally a parking brake system would be the parking brake lever (either a hand activated lever with a ratcheting lock and release lever, or a foot brake pedal with a ratcheting mechanism that releases when pushed to its maximum.), cables continuing from the parking brake lever to the rear drums, and the parts inside of the standard rear drum brake that are activated by pulling the cables. This system is used to prevent a car from moving when parked on an incline, or to prevent the transmission from jamming in Park which can happen when towing a load or parking a heavy vehicle on a hill.
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