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Antilock Brake Systems

chapter 19. Antilock Brake Systems. Objectives. Identify and describe Bendix antilock braking systems. Explain the operation and components of Bosch antilock braking systems. Describe the operation of Delphi antilock braking systems.

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Antilock Brake Systems

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  1. chapter19 Antilock Brake Systems

  2. Objectives • Identify and describe Bendix antilock braking systems. • Explain the operation and components of Bosch antilock braking systems. • Describe the operation of Delphi antilock braking systems. • Identify and describe Kelsey-Hayes antilock braking systems.

  3. Objectives • Describe the operation and components of Teves antilock braking systems. • Identify and describe Toyota rear-wheel and four-wheel antilock braking systems. This chapter will help you prepare for Brakes (A5) ASE certification test content area “F” (Antilock Brake System Diagnosis and Repair).

  4. Bendix 9 ABS • The Bendix 9 ABS, which uses nine solenoids, was used in the late 1980s and early 1990s in Jeeps. • The Bendix 9 ABS is an integral ABS system that combines the master brake cylinder with the hydraulic control modulator and two accumulators.

  5. FIGURE 19–1 Bendix 9 ABS contains nine solenoids and was used on older model Jeeps.

  6. Bendix 9 ABS • System Description • Pressure Switches and Valves

  7. Dual Accumulators • Bendix 9 uses two accumulators: • A high-pressure accumulator, located on the master cylinder booster assembly, • Is nitrogen precharged to 1,000 PSI (6,900 kPa) and capable of storing fluid at 1,700 to 2,000 PSI (12,000 to 14,000 kPa).

  8. Dual Accumulators • A low-pressure accumulator, precharged at 350 PSI (2,400 kPa), but also capable of storing fluid at 1,700 to 2,000 PSI, serves primarily as a fluid reservoir. • System Operation

  9. FIGURE 19–2 Bendix 10 systems use four isolation valves, three decay valves, and three build valves.

  10. Bendix 10 ABS • System Description • Dual Accumulators • Power Switches and Transducers

  11. FIGURE 19–3 Bendix 10 hydraulic control unit.

  12. Bendix 6 ABS • The Bendix 6 system uses six solenoids and is used on many early 1990s Chrysler vehicles. • The Bendix 6 system is a nonintegral ABS system with a conventional master brake cylinder and power booster. • The hydraulic modulator, pump/motor, and accumulator assembly is located on the frame rail.

  13. FIGURE 19–4 Bendix 6 ABS is a nonintegral system.

  14. Bendix 6 ABS • System Description • Dual Accumulators • Pressure Switch • Pump Motor and Control Module

  15. FIGURE 19–5 Bendix 6 schematic showing the normal braking mode (pressure increase stage).

  16. FIGURE 19–6 Bendix 6 modulator with dual accumulators.

  17. Bendix LC4 ABS • Bendix calls this Bendix III, but Chrysler refers to it as LC4 (for “Low Cost” system). • It is a lighter, more compact version of the Bendix 6 nonintegral ABS system it supersedes. • It is a nonintegral ABS system with a conventional master cylinder and vacuum booster, and is functionally similar to the Bendix 6 system.

  18. Bendix LC4 ABS • System Description • System Operation • Dual Accumulators • Pump Motor and Control Module

  19. FIGURE 19–7 Bendix LC4 system schematic.

  20. FIGURE 19–8 Bendix LC4 modulator and pump assembly.

  21. Bendix ABX-4 • It is a four-wheel, four-channel ABS system with a more compact design than earlier Bendix systems. • On models with ABS, the master cylinder has only two outlets (one for the primary brake circuit and one for the secondary brake circuit).

  22. Bendix ABX-4 • Both lines are routed to the hydraulic modulator assembly, which Chrysler refers to as the hydraulic control unit (HCU). Inside the master cylinder are more differences. • Those without ABS use a standard compensating port design with two screw-in proportioning valves.

  23. Bendix ABX-4 • System Description • No Accumulators

  24. FIGURE 19–9 Bendix ABX-4 hydraulic control unit.

  25. FIGURE 19–10 The wiring schematic for the Bendix ABX-4 hydraulic control unit.

  26. FIGURE 19–11 Bendix ABX-4 wiring harness and component locations.

  27. Bendix Mecatronic II • The Ford Contour and Mercury Mystique use the Bendix Mecatronic II ABS system. • It is a four-wheel, four-channel, nonintegral ABS system with four-wheel speed sensors and a conventional master cylinder and power booster. • The Mecatronic II ABS system also provides traction control.

  28. Bendix Mecatronic II • System Description • Dual Microprocessors • Traction Control

  29. FIGURE 19–12 Bendix Mecatronic modulator controls ABS and drive wheel traction during acceleration.

  30. FIGURE 19–13 Bendix Mecatronic system with traction control showing component locations.

  31. FIGURE 19–14 Bendix Mecatronic throttle actuator pushes back the throttle linkage to help reduce wheel spin by reducing engine torque.

  32. Bosch 2 ABS • Bosch 2 ABS has been used on a wide variety of domestic and import brand vehicles • Including Audi, BMW, Chevrolet Corvette, Infiniti, Lexus, Mercedes, Porsche, Mazda, Mitsubishi, Nissan, Rolls-Royce, Subaru, and Volvo. • Nonintegral ABS system with a conventional master brake cylinder and vacuum power booster

  33. Bosch 2 ABS • System Description • System Operation

  34. FIGURE 19–15 Bosch 2 ABS system showing the location of the components.

  35. FIGURE 19–16 Bosch 2 system hydraulic modulator.

  36. Bosch 2E ABS • Bosch 2E is a variant of Bosch 2 and is also a nonintegral, four-wheel, three-channel ABS system with a conventional master cylinder and brake booster. • It is used on many Chrysler and Japanese import brands.

  37. Bosch 2E ABS • Each wheel has its own adjustable wheel speed sensor. • The hydraulic modulator contains three three-way ABS solenoids: one for each front brake, and a common solenoid for both rear brakes.

  38. FIGURE 19–17 Bosch 2U ABS system components.

  39. FIGURE 19–18 Bosch ABS/ASR system in normal braking mode.

  40. FIGURE 19–19 Bosch ABS/ASR system in the pressure hold mode.

  41. FIGURE 19–20 Bosch ABS/ASR system in the pressure decrease mode.

  42. Bosch 5 Series • The Bosch 5.3 is used on 1998 and later Camaro, Firebird, Pontiac Grand Prix, Oldsmobile Intrigue, and Cadillac Catera. • Another variant, the Delphi/Bosch hybrid, is found on 1996 and later Pontiac Bonneville, Buick Park Avenue, Buick LeSabre, Oldsmobile 98, and Oldsmobile 88.

  43. Bosch 5 Series • The Bosch 5 series systems are nonintegral, four-wheel ABS with traction control. • However, they are four-channel, rather than three-channel, systems with a compact “unitized” design.

  44. FIGURE 19–21 Bosch 5 ABS modulator.

  45. Bosch 5 Series • System Operation • Traction Control

  46. Delphi ABS-VI • The Delphi (Delco Moraine) ABS-VI antilock braking system has been used on many General Motors vehicles since the early 1990s. • It is a nonintegral ABS system with a conventional master brake cylinder and power booster.

  47. Delphi ABS-VI • The brake systems on these applications are split diagonally, • So the primary (rear) master cylinder piston operates the right front and left rear brakes, and the secondary (front) piston operates the left front and right rear brakes.

  48. Delphi ABS-VI • System Description • Hydraulic Modulator and Motor Pack • System Operation • Traction Control

  49. FIGURE 19–22 Delphi ABS-VI components.

  50. FIGURE 19–23 Delphi ABS-VI modulator, motor pack, and master cylinder.

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