Please enable JavaScript to view this page.

Heavy Duty Diesel Brakes

HDD 204

Heavy Duty Diesel Brakes

HDD 204

Course Description

Prerequisite: HDD 106 with a grade of "C" (2.0) or better. Corequisites: HDD 151 and HDD 156. Introduces and practices the inspection and maintenance of hydraulic, mechanical and ellectrical braking systems for heavy duty diesel vehicles. Practices NATEF tasks related to hydraulic, mechanical and electrical braking systems for heavy duty diesel vehicles. (65-40)

Outcomes and Objectives

Complete heavy duty diesel NATEF tasks related to Air Brakes as listed below.

Objectives:

  • Air Supply and Service Systems
  • Mechanical/Foundation Brakes
  • Parking Brakes

Complete heavy duty diesel NATEF tasks related to Hydraulic Brakes as listed below.

Objectives:

  • Hydraulic System
  • Mechanical/Foundation Brakes
  • Power Assist Units

Complete heavy duty diesel NATEF tasks related to Air and Hydraulic Antilock Brake Systems (ABS) and Automatic Traction Control (ATC) as listed below.

Objectives:

  • Observe antilock brake system (ABS) warning light operation (includes trailer and dash mounted trailer ABS warning light); determine needed action.
  • Diagnose antilock brake system (ABS) electronic control(s) and components using self-diagnosis and/or electronic service tool(s); determine needed action.
  • Identify poor stopping and wheel lock-up problems caused by failure of the antilock brake system (ABS); determine needed action.
  • Test and check operation of antilock brake system (ABS) air, hydraulic, electrical, and mechanical components; perform needed action.
  • Test antilock brake system (ABS) wheel speed sensors and circuits; adjust or replace as needed.
  • Bleed the ABS hydraulic circuits.
  • Observe automatic traction control (ATC) warning light operation; determine needed action.
  • Diagnose automatic traction control (ATC) electronic control(s) and components using self-diagnosis and/or specified test equipment (scan tool, PC computer); determine needed action.
  • Verify power line carrier (PLC) operations.

Complete heavy duty diesel NATEF tasks related to Wheel Bearings as listed below.

Objectives:

  • Clean, inspect, lubricate and replace wheel bearings and races/cups; replace seals and wear rings; inspect spindle/tube; inspect and replace retaining hardware; adjust wheel bearings. Verify end play with dial indicator method.
  • Identify, inspect or replace unitized/preset hub bearing assemblies.