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SECTION 4E

REAR BRAKES

SPECIFICATIONS

General Specifications

Application
Value (s)
Front Brake Rotors
Diameter
303 mm
Thickness
20 mm
Discard Thickness
18.4
Leteral Runout (Installed)
0.04 mm
Brake Caliper Diameter
Rear
40 mm (Single)
Rear Brake Pad
Thickness
9 mm
Discard Thickness
2 mm
Parking Brake Shoe
Thickness
4 mm

Fastener Tightening Specifications

Application
N•m
Lb-Ft
Lb-In
Brake Hose Inlet Bolt and Ring Seals
44
32
-
Caliper Bracket Bolts
100
74
-
Rotor Detent Screw
8
-
71
Hub to Knuckle Bolts
65
48
-
Brake Caliper (lower) Guide Pin Bolts
44
32
-

DIAGNOSIS

Brake Pad and Parking Brake Shoe Inspection

  1. Raise and suitably support the vehicle.
  2. Remove the rear wheels. Refer to Section 2E, Tiresand Wheels.
  3. Visually check the brake pad and parking brake shoe for minimumthickness and wear.
  4. Measure the thickness. Refer to "General Specifications" in this section.
  5. Install the shoes in axle sets only.
  6. Install the shoes in axle sets only.
  7. Install the rear wheels. Refer to Section 2E, Tires andWheels.
  8. Lower the vehicle.

Rotor Inspection

Brake rotors are manufactured with close tolerances for thickness variation, flatness, and lateral runout, but pits and grooves are created in rotors during usage. Lack of uniformity of the braking surfaces of the rotor can cause inadequate braking and a pulsating pedal during braking. The surface finish of the rotor is also important because an unsuitable surface finish can cause pulling and rapid wear of the brake shoe lining. If a rotor does not meet the specification, it should be refinished to specification or replaced. Refinishing of the rotor should only be done with precision equipment.
Thickness variation can be checked by measuring the thickness of the rotor at four or more points around the circumference of the rotor. All measurements must be made at the same distance from the edge of the rotor. A rotor that varies by more than. 1.0 mm (0.04 inch) can cause pedal pulsation and/or front end vibration during braking. Thickness can be measured with a commercially available micrometer and should be 20 mm(0.79 inch) or over.

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Light scoring of the rotor surfaces is acceptable if it doesnot exceed 0.40 mm (0.016 inch) in depth. Scoring measurementscan be made with a commercially availablebrake micrometer.
Lateral runout cannot exceed 0.04 mm (0.001 inch). Iflateral runout exceeds the specification, make sure thatthere is no dirt between the rotor and the hub and thathub-to-rotor contact surfaces are smooth and free fromburrs. Use a commercially available dial indicator tocheck the lateral runout according to the following procedure.
  1. Position the transaxle in NEUTRAL and raise the vehicle.
  2. To preserve wheel balance, mark the relative positionsof the wheel and hub, and remove the rear wheel.
  3. Fasten the brake rotor to the wheel hub.
  4. Mount a dial indicator on the brake caliper.
  5. Place the indicator tip approximately 10 mm (0.39inch) from the outer edge of the brake rotor, perpendicularto the disc and under slight preload. Observethe indicator gauge while rotating the rotor.
  6. After measuring is completed, remove the dial indicatorand the wheel nuts.
  7. If necessary, refinish the rotor with precision equipment.Measure the runout again after refinishing. Ifthe runout exceeds 0.04 mm (0.001 inch) after refinishing,the rotor should be replaced.
  8. Align the marks that were made before wheel removal,and install the rear wheel.
  9. Lower the vehicle.

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MAINTENANCE AND REPAIR

ON-VEHICLE SERVICE


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Brake Pads

Removal Procedure

  1. Raise and suitably support the vehicle.
  2. Remove the rear wheels. Refer to Section 2E, Tiresand Wheels.
  3. Remove the brake caliper lower guide pin bolt.

    4. Important : Caliper removal is not necessary to servicethe brake pads.


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  4. Pivot the caliper upward.
  5. Remove the brake pads.

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Installation Procedure

  1. Measure the minimum brake pads thickness. Refer to "General Specifications" in this section.
  2. Install the brake pads into the caliper.
  3. Push the piston inward, if needed.

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    Notice : Avoid damaging the piston seal when the pistonhousing is pulled down.

  4. Pivot the caliper downward and install the bolt.

    5. Tighten
    Tighten the brake caliper lower guide pin bolt to 44 N•m(32 lb-ft).

  5. Install the rear wheels. Refer to Section 2E, Tiresand Wheels.
  6. Lower the vehicle.

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Caliper

Removal Procedure

  1. Raise and suitably support the vehicle.
  2. Mark the position of the rear wheels relative to thewheel hubs and remove the wheels. Refer to Section 2E, Tiresand Wheels.
  3. Remove the bolt and the ring seals that attach thebrake hose inlet fitting to the caliper.
  4. Disconnect the brake hose. Plug the openings in thecaliper and the brake hose to prevent fluid loss orcontamination.
  5. Remove the caliper guide pin bolts.
  6. Remove the caliper.

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Installation Procedure

  1. Install the caliper guide pin bolts.

    2. Tighten
    Tighten the caliper guide pin bolts to 44 N•m(32 lb-ft).

  2. Connect the brake hose with the bolt and ring seals.

    3. Tighten
    Tighten the brake hose inlet bolt and ring seals to44 N•m (32 lb-ft).


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  3. Install the rear wheels. Refer to Section 2E, Tiresand Wheels.
  4. Lower the vehicle.
  5. Fill the master cylinder to the proper level with cleanbrake fluid.
  6. Bleed the caliper. Refer to Section 4A, Hycraulic Brakes.

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Caliper Bracket

Removal Procedure

  1. Remove the caliper guide pin bolts, remove the caliper and pads.

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  2. Remove the caliper bracket bolts.

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Installation Procedure

  1. Install the caliper bracket bolts.

    2. Tighten
    Tighten the caliper bracket bolts to 100 N•m(74 lb-ft).


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  2. Install the brake pads and caliper.

    3. Tighten
    Tighten the caliper guide pin bolts to 44 N•m(32 lb-ft).


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Rotor

Removal Procedure

  1. Remove the caliper bracket. Refer to "Caliper Bracket" in this section.

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  2. Remove the rotor detent screw.
  3. Remove the rotor.

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Installation Procedure

    Important : To guarantee uniform braking, always refinishboth rotors even if only one rotor is defective.

  1. Install the rotor and install thedetent screw.

    2. Tighten
    Tighten the rotor detent screw to 8 N•m (71 lb-in)


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  2. Apply a few drops of thread-locking compound to thecaliper bracket bolts and install the caliperbracket.

    3. Tighten
    Tighten the caliper bracket bolts to 100 N•m (74 lb-ft).


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Hub and Parking Brake Shoe/Back Plate

Removal Procedure

  1. Remove the caliper bracket.

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  2. Remove the rotor detent screw.
  3. Remove the rotor.

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  4. Disconnect the ABS sensor connector.

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  5. Remove the hub bolts.
  6. Remove the hub, parking brake shoe and back plate assembly.

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  7. Remove the upper return spring, lower return spring and adjuster assembly from the parking brake shoe and back plate assembly.
  8. Remove the retaining spring plate, spring and retaining spring pin.
  9. Remove the parking brake shoe.

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  10. Remove the parking brake cable from the back plate.

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Installation Procedure

  1. Install the parking brake cable to the back plate.

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  2. Install the retaining spring pin, parking brake shoe, retaining spring and retaining spring plate.
  3. Install the adjuster assembly, lower return spring and upper return spring.

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  4. Install the hub with bolts.

    5. Tighten
    Tighten the hub bolts to 65 N•m (48 lb-ft).


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  5. Connect the ABS sensor connector.

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  6. Install the rotor with detent screw.

    7. Tighten
    Tighten the rotor detent screw to 8 N•m(71 lb-in).


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  7. Install the caliper bracket with bolts.

    8. Tighten
    Tighten the caliper bracket bolts to 100 N•m (74 lb-ft).

  8. Install the wheel.

GENERAL DESCRIPTIONAND SYSTEM OPERATION

Disc Brake Caliper Assembly

The caliper has a single bore and is mounted to the steering knuckle with two mounting bolts. Hydraulic pressure, created by applying the brake pedal, is converted by the caliper to a stopping force. This force acts equally against the piston and the bottom of the caliper bore to move the piston outward and to slide the caliper inward, resulting in a clamping action on the rotor. This clamping action forces the linings against the rotor, creating friction to stop the vehicle.


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