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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 468 (Brake System - General Information -- F250-F550 Super Duty) >> General Procedures >> Component Bleeding >> Master Cylinder Priming - In-Vehicle or Bench

Master Cylinder Priming - In-Vehicle or Bench

WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Carefully read cautionary information on product label. For EMERGENCY MEDICAL INFORMATION seek medical advice. In the USA or Canada on Ford/Motorcraft products call: 1-800-959-3673. For additional information, consult the product Material Safety Data Sheet (MSDS) if available. Failure to follow these instructions may result in personal injury.
CAUTION: Do not allow the brake master cylinder reservoir to run dry during the bleeding operation. Keep the brake master cylinder reservoir filled with the specified brake fluid. Never reuse the brake fluid that has been drained from the hydraulic system.
CAUTION: Brake fluid is harmful to painted and plastic surfaces. If brake fluid is spilled onto a painted or plastic surface, immediately wash it with water.
NOTE: When any part of the hydraulic system has been disconnected for repair or replacement, air can enter the system and cause spongy brake pedal action. This requires bleeding of the hydraulic system after it has been properly connected. The hydraulic system can be bled manually or with pressure bleeding equipment.
NOTE: When the brake master cylinder has been replaced or the system has been emptied, or partially emptied, it should be primed to prevent air from entering the system.
  1. For in-vehicle priming, disconnect the brake lines.
    Fig 1: Disconnecting Brake Lines
    G04644500Courtesy of FORD MOTOR CO.
  2. For bench priming, mount the brake master cylinder in a vise.
    Fig 2: Identifying Mount Brake Master Cylinder In Vise
    G04644501Courtesy of FORD MOTOR CO.
  3. Install short brake tubes with the ends submerged in the brake master cylinder reservoir, and fill the brake master cylinder reservoir with specified brake fluid.
    Fig 3: Identifying Short Brake Tubes With Ends Submerged In Brake Master Cylinder Reservoir
    G04644502Courtesy of FORD MOTOR CO.
  4. Have an assistant pump the brake pedal, or slowly press the primary piston until clear fluid flows from both brake tubes, without air bubbles.
  5. If the brake master cylinder is being primed at the bench, install it in the vehicle. For additional information, refer to HYDRAULIC BRAKE ACTUATION .
  6. Remove the short brake tubes, and install the brake outlet tubes.
  7. Bleed each brake tube at the brake master cylinder as follows:
    1. Have an assistant pump the brake pedal, and then hold firm pressure on the brake pedal.
    2. Loosen the rearmost brake tube fittings until a stream of brake fluid comes out. While the assistant maintains pressure on the brake pedal, tighten the brake tube fitting.
      • Tighten to 25 Nm (18 lb-ft).
    3. Repeat this operation until clear, bubble-free fluid comes out.
    4. Refill the brake master cylinder reservoir as necessary. Repeat the bleeding operation at the front brake tube.
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