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Home >> Ford >> 2021 >> Bronco First Edition, 4D Utility >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brake System - General Information >> General Procedures >> Brake System Pressure Bleeding - Vehicles With: Vacuum Brake Booster

Brake System Pressure Bleeding - Vehicles With: Vacuum Brake Booster

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Special Tool(s) / General Equipment 

Brake/Clutch System Pressure Bleeder/Filler
Fluid Container

Bleeding 

All vehicles 

NOTE: If the fluid is spilled on the paintwork, the affected area must be immediately washed down with cold water.
  1. NOTE: Make sure the area around the master cylinder cap is clean and free of foreign material.

    Remove the brake fluid reservoir cap.

    GFD623684Courtesy of FORD MOTOR COMPANY
  2. Make sure the fluid reservoir is filled with clean specified brake fluid. Refer to: Specifications .
    GFD623689Courtesy of FORD MOTOR COMPANY
    1. NOTE: Master cylinder pressure bleeder adapter tools are available from various manufacturers of pressure bleeding equipment. Follow the instructions of the manufacturer when installing the adapter.

      Install the bleeder adapter to the brake master cylinder reservoir and attach the bleeder tank hose to the fitting on the adapter. Use the General Equipment: Brake/Clutch System Pressure Bleeder/Filler

    2. NOTE: Make sure the bleeder tank contains enough clean, specified brake fluid to complete the bleeding operation.

      Open the valve on the bleeder tank and apply 207-345 kPa (30-50 psi) to the brake system.

  3. Refer to: Jacking and Lifting .
  4. Bleeding steps must be followed in the order indicated in the graphic.
    Fig 1: Bleeding Sequence
    GFD623690Courtesy of FORD MOTOR COMPANY
  5. If equipped, Remove the bleeder screw cap.
    GFD623691Courtesy of FORD MOTOR COMPANY
  6. Partially fill a clean brake fluid container with clean specified brake fluid. Refer to: Specifications  . Use the General Equipment: Fluid Container
    GFD623692Courtesy of FORD MOTOR COMPANY
  7. Submerge a hose into the brake fluid in the container and connect the hose to bleeder screw.
    GFD623693Courtesy of FORD MOTOR COMPANY
    1. Loosen the bleeder screw.

      Loosen:180°

    2. Leave open until clear, bubble-free brake fluid flows, then tighten the bleeder screw.
    GFD623694Courtesy of FORD MOTOR COMPANY

    Vehicles with rear integral parking brake calipers 

  8. NOTE: Due to the complexity of the fluid path within the rear integral parking brake calipers, it is necessary to apply and release the parking brake during the bleed procedure.

    1. Apply and release the parking brake 5 times.
    2. Loosen: 180°
    3. Leave open until clear, bubble-free fluid flows and then tighten the bleeder screw.
    4. Repeat as necessary.

    GFD623695Courtesy of FORD MOTOR COMPANY

    All vehicles 

  9. GFD623696Courtesy of FORD MOTOR COMPANY

    1. Tighten the bleeder screw to specification. Refer to: Specifications .

  10. If equipped, Install the bleeder screw cap.
    GFD623691Courtesy of FORD MOTOR COMPANY
  11. Go to step  7 and repeat the bleeding steps at the remaining wheel ends.
  12. Lower the vehicle.
  13. Close the bleeder tank valve and release the pressure. Remove the General Equipment: Brake/Clutch System Pressure Bleeder/Filler
  14. Fill the reservoir with clean, specified brake fluid. Refer to: Specifications .
    GFD623689Courtesy of FORD MOTOR COMPANY
  15. Install the brake fluid reservoir cap.
    GFD623684Courtesy of FORD MOTOR COMPANY
  16. Apply the brake pedal several times to verify correct brake system operation.