This SAE Recommended Practice establishes uniform test procedures for friction based parking brake components used in conjunction with hydraulic service braked vehicles with a gross vehicle weight rating greater than 4500 kg (10 000 lb). The components covered in this document are the primary actuation and the foundation park brake. Various peripheral devices such as application dashboard switches or indicators are not included. These test procedures include the following:
a
Brake Related Tests
1
Brake Functional Performance
2
Brake Dynamic Torque Performance
3
Brake Corrosion Resistance
4
Brake Endurance with Torque
5
Brake Endurance without Torque
6
Vibration Resistance
7
Brake Ultimate Static Load
8
Brake Lining Wear Adjuster Function
b
Actuation Related Tests
1
Mechanical Actuator Functional Performance
2
Mechanical Actuator Endurance
3
Mechanical Actuator Quick Release
4
Mechanical Actuator Ultimate Load
5
Spring Apply Actuator Functional Performance
6
Spring Apply Actuator Operating Temperature Range
7
Spring Apply Actuator Endurance
8
Spring Apply Actuator Corrosion Resistance
9
Spring Apply Actuator On-Off Switch
10
Spring Apply Actuator Vibration
Rationale
SAE J2690 specifies uniform accelerated laboratory test procedures for evaluating comparative performance characteristics of friction type parking brake components designed to operate in conjunction with hydraulic brake systems. These tests are based upon long standing industry practices.
Vibration data shown in Table 3 was derived at axle location. A decision to use this data for axle or transmission mounted parking brakes was made under the assumption that in most cases, using axle data for transmission mounted parking brakes would be conservative.
The Truck and Bus Hydraulic Brake Committee of the Truck and Bus Brake and Advanced Driver Assistance Systems Steering Committee is responsible for developing, reviewing, and approving recommended practices, standards, and information reports related to brake systems on hydraulically braked trucks and buses over 10,000 lbs (4500 Kg) GVWR designed for on-highway use. The responsibility of this committee will include the following related aspects of hydraulically braked vehicles with due care given to coordinate with and avoid duplicating efforts of the other committees: Braking performance - system components performance (to include but not limited to actuation systems, foundation brake, park brake, electronically controlled brake systems and anti-lock brake systems)
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J2690_201201
Driveline Parking Brake Test Procedure for Medium Duty Vehicles
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Driveline Parking Brake Test Procedure for Medium Duty Vehicles
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