Maricopa Community Colleges  DIE129   19946-20086 
Official Course Description: MCCCD Approval: 07/22/08
DIE129 19946-20086 LEC 3 Credit(s) 3 Period(s)
Air Brake Systems
Methods of servicing "S" cam, wedge, and disc brakes. Preventive maintenance, trouble shooting and repair stressed.
Prerequisites: None.
Cross-References: AUT129
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MCCCD Official Course Competencies:
 
DIE129   19946-20086 Air Brake Systems
1. Describing the fundamentals of brakes and the factors affecting braking. (I)
2. Identify components and describe their function in a basic brake system. (II)
3. Describe design features that protect the truck or machine in event of service brake failure. (III)
4. Identify and describe function of brake equipment. (IV)
5. Perform general maintenance and testing on brake systems. (V)
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MCCCD Official Course Outline:
 
DIE129   19946-20086 Air Brake Systems
    I. Fundamentals of Brakes
        A. Coefficient of friction
          1. Factors affecting coefficient
            a. Material
            b. Condition of material
        B. Conversion of energy of motion to heat energy
          1. Methods of heat dissipation
          2. Effect of heat build up
        C. Effect of speed and weight on braking
        D. Use of leverage
          1. Transmit force and motion
          2. Increase mechanical advantage
        E. Examples of levers
          1. Slack adjuster
          2. Brake cam
          3. Brake shoe
          4. Wedges cam
        F. Compressed air as energy source
      II. Components of Basic Air Brake System
          A. Air compressor
            1. Gear or belt driven
            2. Pumps compressed air to reservior
          B. Reservior
            1. Stores energy in form of compressed air
          C. Brake valve
            1. Driver operated
            2. Regulates air flow to brake chamber
          D. Brake chamber
            1. Point at which energy of compressed air is transformed into mechanical force and motion
          E. Brake assembly
            1. Point at which mechanical force and motion is transformed into actual braking force
        III. Basic Brake Types
            A. Service brake
              1. Air
              2. Air over hydraulic
              3. Drum and expanding shoe
                a. Scam
                b. Wedge cam
              4. Caliper disc
              5. Multiple disc
            B. Parking/Emergency
              1. Automatic
              2. Manual
              3. Air
              4. Spring
              5. Drum and expanding shoe
              6. Disc and caliper
              7. External contracting band
          IV. Brake Equipment
              A. Air compressors
              B. Governors
              C. Valves
                1. Treadle
                2. Single check
                3. Double check
                4. Relay
                5. Quick release
                  a. Limiting quick release
                6. Trailer control
                7. Relief (safety)
                8. Tractor protection
                9. Push/pull valves
              D. Indicator switches
                1. Low pressure warning
                2. Stoplight
                3. Warning buzzer
              E. Brake chambers
              F. Slack adjusters
                1. Manual
                2. Self adjusting
              G. Reserviors
              H. Power clusters
                1. Air cylinder operation
                2. Hydraulic cylinder operation
              I. Wheel cylinders
              J. Brake cams
              K. Tubing, hose and fittings
              L. Optional equipment
                1. Alcohol injector
                2. Air dryer
            V. General Maintenance and Testing
                A. Balanced braking
                  1. Pneumatic
                  2. Mechanical
                B. Adjustments
                C. Leak detection
                D. Operational checks
                E. Safety checks
                F. Safety rules
                G. Trouble shooting
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