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Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
Halderman ch092 lecture
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Halderman ch092 lecture

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  • Figure 92-1 Typical vehicle brake system showing all typical components.
  • Figure 92-2 Typical drum brake assembly.
  • Figure 92-3 Typical disc brake assembly.
  • Figure 92-4 Typical brake system components.
  • Figure 92-5 The red brake warning light will remain on after a bulb test if there is a fault with the hydraulic part of the brake system.
  • Figure 92-7 Typical components of an antilock braking system (ABS) used on a rear-wheel-drive vehicle.
  • Transcript

    • 1. BRAKING SYSTEM COMPONENTS AND PERFORMANCE STANDARDS 92
    • 2. Objectives
      • The student should be able to:
        • Prepare for the Brakes (A5) ASE certification test.
        • List the parts and terms for disc and drum brakes.
        • Describe brake design requirements.
        • List the six brake system categories.
        • Discuss federal braking and stopping standards.
    • 3. FUNDAMENTALS OF BRAKE SYSTEMS
    • 4. Fundamentals of Brake Systems
      • By far most important mechanism on any vehicle
      • Brakes on average vehicle applied 50,000 times a year
      • Energy-absorbing mechanism converts vehicle movement into heat while stopping rotation of wheels
    • 5. Fundamentals of Brake Systems
      • Service brakes main driver-operated brakes of vehicle
      • Also called base brakes or foundation brakes
    • 6. Figure 92-1 Typical vehicle brake system showing all typical components.
    • 7. Fundamentals of Brake Systems
      • Brake System Parts
        • To stop wheel, driver exerts force on brake pedal
        • Force pressurizes brake fluid in master cylinder
    • 8. Fundamentals of Brake Systems
      • Brake System Parts
        • Hydraulic pressure to each wheel cylinder or caliper forces friction materials against brake drum or rotor
        • Friction causes rotating wheel to slow and eventually stop
    • 9. Fundamentals of Brake Systems
      • Brake System Parts
        • Drum brakes
          • Used on rear of many vehicles
          • When applied, brake shoes move outward against rotating brake drum
    • 10. Fundamentals of Brake Systems
      • Brake System Parts
        • Drum brakes
          • When drum slows and stops, wheels also slow and stop
          • Economical to manufacture, service, repair
    • 11. Figure 92-2 Typical drum brake assembly.
    • 12. Fundamentals of Brake Systems
      • Brake System Parts
        • Disc brakes
          • Used on front of most vehicles and rear of many
          • Squeezes brake pads on both sides of rotor or disc attached to wheel
          • Wheel slows and stops
    • 13. Figure 92-3 Typical disc brake assembly.
    • 14. Fundamentals of Brake Systems
    • 15. BRAKE DESIGN REQUIREMENTS
    • 16. Brake Design Requirements
      • Equal forces applied to left and right sides vehicle to assure straight stops
      • Hydraulic systems properly engineered and serviced to provide for changes as vehicle weight shifts forward during braking
    • 17. Brake Design Requirements
      • Valves must be used in hydraulic system to permit maximum braking forces but prevent undesirable wheel lockup
      • Hydraulic system must use fluid that will not evaporate or freeze under extreme conditions
    • 18. Brake Design Requirements
      • Friction material (brake shoes or brake pads) must provide adequate friction between stationary and rotating parts; should be environmentally safe
      • Design should secure brake lining solidly to prevent movement of friction material during braking
      • Incorporate power assist unit; most commonly vacuum operated
    • 19. BRAKE SYSTEM CATEGORIES
    • 20. Brake System Categories
      • Components classified into six subsystems, depending on function
        • Apply system
        • Boost system
        • Hydraulic system
    • 21. Brake System Categories
      • Components classified into six subsystems, depending on function
        • Wheel brakes
        • Brake balance control system
        • Brake warning lights
    • 22. Figure 92-4 Typical brake system components.
    • 23. Figure 92-5 The red brake warning light will remain on after a bulb test if there is a fault with the hydraulic part of the brake system.
    • 24. ANTILOCK BRAKE SYSTEM OVERVIEW
    • 25. Antilock Brake System Overview
      • Purpose: to prevent wheels from locking during braking
      • Friction between tire tread and road actually stops vehicle
      • ABS does not mean that vehicle can stop quickly on all road surfaces
    • 26. Antilock Brake System Overview
      • ABS uses sensors at wheels to measure wheel speed
      • If wheel rotating slower than others, indicates possible lockup
      • ABS hydraulic controller reduces pressure to wheel for fraction of second
    • 27. Antilock Brake System Overview
      • Controller reapplies pressure fraction of second later
      • If wheel starts to lock up, ABS system pulses brakes on and off to maintain directional stability with maximum braking force
      ?
    • 28. Figure 92-7 Typical components of an antilock braking system (ABS) used on a rear-wheel-drive vehicle.
    • 29. FEDERAL BRAKE STANDARDS
    • 30. Federal Brake Standards
      • Federal Motor Vehicle Safety Standards (FMVSS)
      • FMVSS Standard 135
        • Ensure safe braking performance under normal and emergency conditions
    • 31. Federal Brake Standards
      • FMVSS Standard 135
        • Establishes specific brake performance requirements
        • Only four parts of brake system specifically regulated:
          • Fluid reservoir and labeling
    • 32. Federal Brake Standards
      • FMVSS Standard 135
        • Only four parts of brake system specifically regulated:
          • Dashboard warning lights
    • 33. Federal Brake Standards
      • FMVSS Standard 135
        • Only four parts of brake system specifically regulated:
          • A method of automatic adjustment
    • 34. Federal Brake Standards
      • FMVSS Standard 135
        • Only four parts of brake system specifically regulated:
          • A mechanically engaging, friction-type parking brake system
    • 35. Federal Brake Standards
      • FMVSS 135 Brake Test
        • Overall test procedure consists of up to 24 steps
        • Burnish procedure
        • Adhesion utilization (torque wheel method)
    • 36. Federal Brake Standards
      • FMVSS 135 Brake Test
        • Cold effectiveness
        • High speed effectiveness
        • Stops with the engine off
    • 37. Federal Brake Standards
      • FMVSS 135 Brake Test
        • Antilock functional failure
        • Variable brake proportioning system
        • Hydraulic circuit failure
    • 38. Federal Brake Standards
      • FMVSS 135 Brake Test
        • Brake power assist unit inoperative
        • Parking brake
        • Brake heat test
        • Hot performance
      ?
    • 39. BRAKE REPAIR AND THE LAW
    • 40. Brake Repair and the Law
      • Responsibility for brake maintenance falls on vehicle owner
      • Many states have laws regulating brake work to help ensure safe repairs
      • Technician always liable for damage or injuries resulting from repairs performed in an unprofessional or unworkmanlike manner
    • 41. FREQUENTLY ASKED QUESTION
      • How Do Adjustable Pedals Work?
        • Adjustable pedals, also called electric adjustable pedals (EAP), place the brake pedal and the accelerator pedal on movable brackets that are motor operated. A typical adjustable pedal system includes the following components:
      ? BACK TO PRESENTATION
        • Adjustable pedal position switch, which allows the driver to position the pedals.
        • Adjustable pedal assembly, which includes the motor, threaded adjustment rods, and a pedal position sensor.
      • The position of the pedals, as well as the position of the seat system, is usually included as part of the memory seat function and can be set for two or more drivers.
        • Figure 92-6 A typical adjustable pedal assembly. Both the accelerator and the brake pedal can be moved forward and rearward by using the adjustable pedal position switch.
    • 42. FREQUENTLY ASKED QUESTION
      • Do the FMVSS 135 Standards Apply to Replacement Brake Part Performance?
        • No. The Federal Motor Vehicle Safety Standard 135 applies to new vehicles. Replacement parts used during a brake repair or replacement may or may not permit the vehicle to achieve the same standards as when new.
      ? BACK TO PRESENTATION
      • To help ensure like-new braking performance, the service technician should always use quality brake parts from a known manufacturer.

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