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Master Cylinder, In Vehicle WARNING: Brake fluid contains polyglycol ethers and polyglycols. Avoid contact with eyes. Wash hands thoroughly after handling. If brake fluid contacts eyes, flush eyes with running water for 15 minutes. Get medical attention if irritation persists. If taken internally, drink water and induce vomiting. Get medical attention immediately. 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 new installation, air may get into the system and cause spongy brake pedal action. This requires bleeding of the hydraulic system after it has been correctly connected. The hydraulic system can be bled manually or with pressure bleeding equipment. 1. NOTE: When a new brake master cylinder has been installed or the system has been emptied, or partially emptied, it should be primed to prevent air from getting into the system. Disconnect the brake master cylinder outlet tubes. 2. Install short brake tubes with ends submerged in the brake master cylinder reservoir and fill the brake master cylinder reservoir with High Performance DOT 3 Brake Fluid C6AZ- 19542-AB or equivalent DOT 3 fluid meeting Ford specification ESA-M6C25-A. 3. Have an assistant pump the brake pedal until clear fluid flows from both brake tubes without air bubbles. 4. Remove the short brake tubes and install the brake outlet tubes. 5. 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. Have an assistant maintain pressure on the brake pedal while tightening the brake tube fitting. 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. 6. While the assistant maintains pressure on the brake pedal, tighten the brake tubes.

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Master Cylinder Priming — In-Vehicle or Bench 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 installation of new components, air can enter the system and cause spongy brake pedal (2455) action. This requires bleeding of the hydraulic system after it has been correctly connected. The hydraulic system can be bled manually or with pressure bleeding equipment. NOTE: When a new brake master cylinder (2140) has been installed 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. 2. For bench priming, mount the brake master cylinder (2140) in a vise. 3. Install short brake tubes with the ends submerged in the brake master cylinder reservoir (2K478), and fill the brake master cylinder reservoir with High Performance DOT 3 Brake Fluid C6AZ-19542-AB or equivalent DOT 3 fluid meeting Ford specification ESA-M6C25-A. 4. Have an assistant pump the brake pedal (2455), or slowly depress the primary piston until clear fluid flows from both brake tubes, without air bubbles. 5. If the brake master cylinder has been primed at the bench, install it in the vehicle. For additional information, refer to Section 206-06. 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 rear most 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. 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. Master Cylinder Priming — 4.6L 1. CAUTION: Use only bleed screws on the engine side of the brake master cylinder (2140). The hydro-boost bleed screw, located near the dash on the hydro-booster casting, is for the booster cavity filled with power steering fluid, not brake fluid. Connect a clear waste line to the bleed screw closet to the booster first and the other end in a container partially filled with recommended brake fluid.

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Incomplete clutch release and/or hydraulic fluid leaking into the cab from the clutch master cylinder may be caused by the reinforcement plate on the clutch master cylinder separating from the dash panel. The separation of the reinforcement plate reduces the clutch master cylinder pushrod travel. Reinforcement plate separation can also cause deflection of the clutch master cylinder that results in a misalignment of the pushrod to the clutch master cylinder. Misalignment causes the “O” ring in front of the secondary seal to leak hydraulic fluid. ACTION Inspect the truck and, if necessary, use the following service procedure to install a reinforcement kit. INSPECTION PROCEDURE 1. If the truck is a 1988 or later model, confirm that the starter interlock switch operates (the engine can be started) with the clutch pedal at least 0.5″ (12.7 mm) from the floor. 2. Test drive the truck and check for good clutch release. There should be no grinding of the gears, particularly when shifting from neutral to reverse gear. 3. If the truck passes these tests, go to the Small Reinforcement Installation Procedure Section of this article. 4. If either of the above conditions are not met, check the hydraulic system for air. Refer to the Suggested Bleeding Procedure at the end of this article. 5. Test drive the truck and check for improved clutch release. 6. If there is no improvement, proceed as follows: a. Remove the clutch master cylinder pushrod from the release lever pin on the release lever. b. Make sure the hole in the pushrod lines up with the pin, for those units requiring a minimal force

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1. Raise and support the vehicle. Using the Hydraulic Line Connector Remover (308-182, T88T-70522-A), disconnect the hydraulic line from the clutch slave cylinder. See Fig. 9 . 2. Lower the vehicle. Remove the 2 screws and the lower steering column finish panel. See Fig. 10 . Remove the 5 bolts and the lower reinforcement panel. See Fig. 11 . 3. Remove the clutch master cylinder reservoir. See Fig. 16 . Remove the 3 push pins, 4 bolts, 4 screws and the inner fender splash shield. 4. Unclip the hydraulic line-to-frame retainer. Twist the clutch master cylinder clockwise 45 degrees to unlock it from the support bracket. See Fig. 17 . Remove the clutch master cylinder reservoir, the slave cylinder hydraulic line and the clutch master cylinder as an assembly. 5. Install a NEW clutch master cylinder push rod bushing. To install, reverse the removal procedure. Rotate the clutch master cylinder 45 degrees counterclockwise. Bleed the clutch hydraulic system. See BLEEDING .

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ISSUE A “soft” unresponsive clutch pedal may be felt or the driver may be unable to release the clutch. This is caused by air entrapped in the clutch hydraulic system. ACTION Use the information in this TSB article in addition to the appropriate bleeding procedure. This article includes detail as well as extra service tips for easier hydraulic clutch bleeding. The clutch hydraulic system for the 1993 model year is new and more difficult to bleed than the previous hydraulic system. Therefore, a different bleeding procedure is required for these vehicles. RANGER, EXPLORER, AEROSTAR The most difficult systems to bleed are on the Ranger, Explorer, Aerostars. NOTE: When installing dry clutch cylinder or tube service parts, do the bench bleed procedure first. BENCH BLEED The compact vehicles are more difficult to bleed because the downward angle of the master cylinder makes it difficult for air to escape up into the reservoir. Therefore, if the master cylinder is removed from the vehicle and bled while held in a vertical orientation (a bench bleed) air can escape much more efficiently. Refer to Fig. 1 . BENCH BLEEDING PROCEDURE (CONCENTRIC SLAVE CYLINDER) 1. Remove master cylinder, line and reservoir from vehicle and assemble with replacement parts required based on initial concern. 2. Hold the master cylinder vertically with the reservoir feed hose in the highest position on the body. See Fig. 1 . 3. Fill the reservoir and extend above the master cylinder and assure the quick connect on the clutch line is below the master cylinder. (Lightly clamp reservoir in a vise). 4. Using a small screwdriver, depress the internal mechanism of the male quick connect coupling to open the valve. See Fig. 1 . 5. Stroke and hold master cylinder pushrod. 6. Close quick connect valve. 7. Release master cylinder pushrod. 8. Fill reservoir. 9. Repeat Steps 4 through 8 four more times. 10. With the master cylinder still being held with the outlet tube and reservoir feed tube ends high, quick connect closed and the reservoir full, proceed as follows: a. Push the pushrod into the body several times quickly to expel any remaining air. b. If it is a remote reservoir, pinch the supply hose with your fingers two or three times to help move air into reservoir. 11. When the movement of the pushrod is .130″ (4mm) or less when stroked in Step 10, reinstall the master cylinder into the vehicle and couple it to the slave cylinder.