Wash. Admin. Code § 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:

RESULTEVEN TORQUE (BRAKE INPUT)BETWEEN BRAKE ADJUSTMENTS
LAST HALF OF CAM ROTATIONLEVERAGE INCREASING TO THE MAXIMUM AND BRAKE CHAMBER EFFICIENCY DECREASING WITH LENGTH OF STROKE.	FIRST HALF OF CAM ROTATIONBRAKE CHAMBER EFFICIENCY IS MAXIMUM AND LEVERAGE IS MINIMUM AT BEGINNING OF STROKE. LEVERAGE INCREASES WITH THE INCREASED MOVEMENT.

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POINT OF GREATEST LEVERAGEMOVEMENT PAST THIS POINT RESULTS IN LESS LEVERAGE, REDUCED INPUT AND LOWER BRAKE EFFICIENCY.	FIRST HALF OF RATED TRAVELBRAKE CHAMBER IS AT THE MAXIMUM EFFICIENCY.

[Statutory Authority: RCW 46.37.005. WSR 14-03-018, § 204-76-99004, filed 1/7/14, effective 2/7/14; WSR 80-10-006 (Order 80-07-01), § 204-76-99004, filed 7/25/80.]