TM 9-2320-361-20 1-18. CONTROL SYSTEMS OPERATION (Contd) d. Parking Brake System Operation. The parking brake system is a manually-operated system that provides a means of keeping the vehicle motionless when it is stopped. Major components of the parking brake system are: PARKING BRAKE CONTROL LEVER - Applies parking brake when pulled to raised position. When lowered, parking brake is released. ADJUSTING KNOB - Permits operator to make minor tension adjustment in parking brake cable. PARKING BRAKE CABLE - Links parking brake lever to actuating lever. BRAKEDRUM - Provides surface for brakeshoes to press against when parking brake is applied. ACTUATING LEVER - Forces inner and outer brakeshoes against brakedrum when parking brake control lever is raised. PARKING BRAKE ADJUSTING SCREW - Used to ensure full contact of brakeshoes with brakedrum. BRAKESHOES - Apply friction to brakedrum when parking brake control lever is raised. ECCENTRIC PIN - Equalizes distance between brakeshoes and brakedrum. 1-42