WAC 204-76-99004. Relationship of push rod and slack adjuster angle to brake force

The following diagram shows the relationship of push rod and slack adjuster angle to brake force: RESULT EVEN TORQUE (BRAKE INPUT) BETWEEN BRAKE ADJUSTMENTS *LAST HALF OF CAM ROTATION* LEVERAGE INCREASING TO THE MAXIMUM AND BRAKE CHAMBER EFFICIENCY DECREASING WITH LENGTH OF STROKE. *FIRST HALF OF CAM ROTATION* BRAKE CHAMBER EFFICIENCY IS MAXIMUM AND LEVERAGE IS MINIMUM AT BEGINNING OF STROKE. LEVERAGE INCREASES WITH THE INCREASED MOVEMENT. RESULT EVEN TORQUE (BRAKE INPUT) BETWEEN BRAKE ADJUSTMENTS *LAST HALF OF CAM ROTATION* LEVERAGE INCREASING TO THE MAXIMUM AND BRAKE CHAMBER EFFICIENCY DECREASING WITH LENGTH OF STROKE. *FIRST HALF OF CAM ROTATION* BRAKE CHAMBER EFFICIENCY IS MAXIMUM AND LEVERAGE IS MINIMUM AT BEGINNING OF STROKE. LEVERAGE INCREASES WITH THE INCREASED MOVEMENT. POINT OF GREATEST LEVERAGE MOVEMENT PAST THIS POINT RESULTS IN LESS LEVERAGE, REDUCED INPUT AND LOWER BRAKE EFFICIENCY. *FIRST HALF OF RATED TRAVEL* BRAKE CHAMBER IS AT THE MAXIMUM EFFICIENCY. POINT OF GREATEST LEVERAGE MOVEMENT PAST THIS POINT RESULTS IN LESS LEVERAGE, REDUCED INPUT AND LOWER BRAKE EFFICIENCY. *FIRST HALF OF RATED TRAVEL* BRAKE CHAMBER IS AT THE MAXIMUM EFFICIENCY.