Driveline Parking Brake Test Procedure for Medium Duty Vehicles
Authors:   Truck and Bus Hydraulic Brake Committee
Published: October 2021

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<div class="htmlview paragraph">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:
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<li class="list-item">
<span class="li-label">a</span>
<div class="htmlview paragraph">Brake Related Tests
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<li class="list-item">
<span class="li-label">1</span>
<div class="htmlview paragraph">Brake Functional Performance</div></li>
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<span class="li-label">2</span>
<div class="htmlview paragraph">Brake Dynamic Torque Performance</div></li>
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<span class="li-label">3</span>
<div class="htmlview paragraph">Brake Corrosion Resistance</div></li>
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<span class="li-label">4</span>
<div class="htmlview paragraph">Brake Endurance with Torque</div></li>
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<span class="li-label">5</span>
<div class="htmlview paragraph">Brake Endurance without Torque</div></li>
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<span class="li-label">6</span>
<div class="htmlview paragraph">Vibration Resistance</div></li>
<li class="list-item">
<span class="li-label">7</span>
<div class="htmlview paragraph">Brake Ultimate Static Load</div></li>
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<span class="li-label">8</span>
<div class="htmlview paragraph">Brake Lining Wear Adjuster Function</div></li></ol></div></li>
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<span class="li-label">b</span>
<div class="htmlview paragraph">Actuation Related Tests
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<li class="list-item">
<span class="li-label">1</span>
<div class="htmlview paragraph">Mechanical Actuator Functional Performance</div></li>
<li class="list-item">
<span class="li-label">2</span>
<div class="htmlview paragraph">Mechanical Actuator Endurance</div></li>
<li class="list-item">
<span class="li-label">3</span>
<div class="htmlview paragraph">Mechanical Actuator Quick Release</div></li>
<li class="list-item">
<span class="li-label">4</span>
<div class="htmlview paragraph">Mechanical Actuator Ultimate Load</div></li>
<li class="list-item">
<span class="li-label">5</span>
<div class="htmlview paragraph">Spring Apply Actuator Functional Performance</div></li>
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<span class="li-label">6</span>
<div class="htmlview paragraph">Spring Apply Actuator Operating Temperature Range</div></li>
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<span class="li-label">7</span>
<div class="htmlview paragraph">Spring Apply Actuator Endurance</div></li>
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<span class="li-label">8</span>
<div class="htmlview paragraph">Spring Apply Actuator Corrosion Resistance</div></li>
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<span class="li-label">9</span>
<div class="htmlview paragraph">Spring Apply Actuator On-Off Switch</div></li>
<li class="list-item">
<span class="li-label">10</span>
<div class="htmlview paragraph">Spring Apply Actuator Vibration</div></li></ol></div></li></ol></div>
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