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Home >> Chevrolet >> 2003 >> Tracker 2D Utility, 4WD, Standard >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc Brakes & Drum Brakes >> System Testing >> Drum Brake System Testing

Drum Brake System Testing

  1. If you were sent here from SYMPTOMS - HYDRAULIC BRAKE  , go to next step. If you were not sent here from SYMPTOMS - HYDRAULIC BRAKE  , see DIAGNOSTIC STARTING POINT - HYDRAULIC BRAKES  under TROUBLE SHOOTING.
  2. Remove the brake drums. See BRAKE DRUM  under REMOVAL & INSTALLATION. Inspect the drum brake shoes for the following conditions:
    • Lining thickness.
    • Uneven or abnormal wear edge-to-edge or side-to-side.
    • Contamination from an external substance.
    • Looseness, damage, glazing, or incorrect lining material.
    Did you find any conditions to indicate a concern with any of the drum brake shoes? If so, go to next step. If not, go to step  7 .
  3. Are any of the brake shoes contaminated? If so, go to next step. If not, go to step  5 .
  4. Inspect the wheel cylinders for evidence of an external brake fluid leak. Replace the wheel cylinder if necessary. See WHEEL CYLINDERS  under REMOVAL & INSTALLATION. Did you complete the inspection and replacement? If so, go to step  6 .
  5. Inspect the drum brake hardware for any components which are worn, damaged, discolored (due to stress), broken or missing. See DRUM BRAKE HARDWARE INSPECTION  under ADJUSTMENTS & INSPECTIONS. Replace components if necessary. See DRUM BRAKE HARDWARE  under REMOVAL & INSTALLATION. Replace the drum brake shoes. See REAR BRAKE SHOES  under REMOVAL & INSTALLATION. Did you complete the inspection and replacement? If so, go to step  8 .
  6. Clean the remaining drum brake system components to remove any traces of the contaminant. Inspect the drum brake hardware for any damaged or missing components. See DRUM BRAKE HARDWARE INSPECTION  under ADJUSTMENTS & INSPECTIONS. Replace the drum brake hardware components if necessary. See DRUM BRAKE HARDWARE  under REMOVAL & INSTALLATION. Replace the contaminated brake shoes. See REAR BRAKE SHOES  under REMOVAL & INSTALLATION. Did you complete the inspection and replacement? If so, go to step  8 .
  7. Inspect the drum brake hardware for any damaged or missing components. See DRUM BRAKE HARDWARE INSPECTION  under ADJUSTMENTS & INSPECTIONS. Replace the drum brake hardware components if necessary. See DRUM BRAKE HARDWARE  under REMOVAL & INSTALLATION. Did you complete the inspection and, if necessary, replacement? If so, go to next step.
  8. Check the diameter of each of the brake drums. Make a determination for each brake drum if the drum can be refinished and remain above the minimum requirements. See BRAKE DRUM DIAMETER MEASUREMENT  under ADJUSTMENTS & INSPECTIONS. Does the brake drum meet the minimum requirements for refinishing? If so, go to next step. If not, go to step  11 .
  9. Inspect each of the brake drums for the following surface and wear conditions:

    Braking Surface Conditions

    • Heavy Rust And/Or Pitting
    • Cracks And/Or Heat Spots
    • Excessive Blueing Discoloration
    • Missing Balance Weights

    Braking Surface Wear Conditions

    • Deep Or Excessive Scoring Beyond Maximum Acceptable Level
    • Radial Runout Beyond Maximum Acceptable Level
    Make a determination for each brake drum if the drum requires refinishing based upon the results of the inspection. If the brake drum exhibits any of the following conditions, it requires refinishing.
    • Drum exhibits one or more of the Braking Surface Conditions listed previously.
    • Drum is beyond the acceptable level in one or more of the Braking Surface Wear Conditions listed previously.
    Does the brake drum require refinishing? If so, go to next step. If not, go to step  14 .
  10. Refinish the brake drum. See BRAKE DRUM REFINISHING  under ADJUSTMENTS & INSPECTIONS. Inspect the brake drum diameter. See BRAKE DRUM DIAMETER MEASUREMENT  under ADJUSTMENTS & INSPECTIONS. Were you able to refinish the brake drum within the minimum requirements? If so, go to step  14 . If not, go to step  13 .
  11. Is the brake drum at or below the discard requirements? If so, go to step  13 . If not, go to next step.
  12. Inspect each of the brake drums for the following surface and wear conditions:

    Braking Surface Conditions

    • Heavy Rust And/Or Pitting
    • Cracks And/Or Heat Spots
    • Excessive Blueing Discoloration
    • Missing Balance Weights

    Braking Surface Wear Conditions

    • Deep Or Excessive Scoring Beyond Maximum Acceptable Level
    • Radial Runout Beyond Maximum Acceptable Level
    Make a determination for each brake drum if the drum requires refinishing based upon the results of the inspection. If the brake drum exhibits any of the following conditions, it requires refinishing.
    • Drum exhibits one or more of the Braking Surface Conditions listed previously.
    • Drum is beyond the acceptable level in one or more of the Braking Surface Wear Conditions listed previously.
    Does the brake drum require replacement? If so, go to next step. If not, go to step  14 .
  13. Replace the brake drum. See BRAKE DRUMS  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to next step.
  14. Inspect the brake shoes for proper adjustment. See DRUM BRAKE ADJUSTMENT  under ADJUSTMENTS & INSPECTIONS. Are the brake shoes adjusted properly? If so, go to step  18 . If not, go to next step.
  15. Inspect the components of the brake drum adjustment hardware system for free movement and correct operation. See DRUM BRAKE ADJUSTING HARDWARE INSPECTION  under ADJUSTMENTS & INSPECTIONS. Do the drum brake adjusting hardware components operate freely and correctly? If so, go to step  17 . If not, go to next step.
  16. Replace the drum brake adjusting hardware components as necessary. See DRUM BRAKE ADJUSTING HARDWARE  under REMOVAL & INSTALLATION. After repairs are complete, go to next step.
  17. Adjust the drum brake shoes. See DRUM BRAKE ADJUSTMENT  under ADJUSTMENTS & INSPECTIONS. Were you able to complete the adjustment? If so, go to step  20 .
    18. NOTE: Drum brake backing plates that come in contact with brake drums may cause brake system noise.
  18. Inspect the drum brake backing plate for the following:
    • Excessive wear or rust.
    • Damage and/or evidence of contact with the brake drum.
    Does the drum brake backing plate exhibit any of these conditions? If so go to next step. If not, go to step  20 .
  19. Repair or replace the drum brake backing plate as necessary. See DRUM BRAKE BACKING PLATE  under REMOVAL & INSTALLATION. Did you complete the repair or replacement? If so, go to next step.
  20. Install or connect components that were removed or disconnected during diagnosis. Is the operation complete? If so, then system should be okay. If system is not okay, go to step  2 .
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