2-10. ENGINE RETARDER BRAKE CONTROLS (Continued).
ClRCUIT BREAKER (CB-6). Protects electrical components of engine retarder brake circuit
by opening when load exceeds 20 amps. Automatically recycles until the overload is
FLOOR PEDAL SWITCH. Allows driver to activate engine brake circuit with his left foot.
When depressed, switch supplies 12-volt power through CB-6, throttle switch, engine retarder
switch, to energize the selected solenoid valve.
THROTTLE SWITCH. Open switch prevents activation of engine retarder brake if hand
throttle is pulled out or accelerator pedal is pressed down. Activating arm on fuel pump lever
closes switch when hand throttle and accelerator are both disengaged.
SOLENOID VALVES. When valves are activated, they operate engine braking mechanism.