Overhaul

Wheel Cylinder





Disassembly

















WARNING: Do not use any fluid other than clean brake fluid meeting manufacturer's specification. Additionally, do not use brake fluid that has been previously drained. Following these instructions will help prevent system contamination, brake component damage and the risk of serious personal injury.

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 serious personal injury.

NOTICE: Do not spill brake fluid on painted or plastic surfaces or damage to the surface may occur. If brake fluid is spilled onto a painted or plastic surface, immediately wash the surface with water.

NOTE: Removal is not necessary to disassemble, inspect, hone or overhaul the rear wheel cylinder.

1. Remove the brake drum. For additional information, refer to Brake Drum Service and Repair.

2. Remove the upper return spring.

3. Remove the lower return spring.

4. Remove the self-adjuster and spring assembly.

5. Remove the retaining springs, the pins and the leading brake shoe.

6. Remove the trailing brake shoe and parking brake actuator lever assembly.
- Clean and dry the brake backing plate.

7. Remove the bleeder screw cap.

8. Remove the bleeder screw.

9. Remove the 2 dust boots.

10. Remove the 2 pistons.

11. Remove the 2 piston seals.

12. Remove the spring.

13. Inspect the wheel cylinder bore for excessive wear, corrosion or pitting. If any of these conditions exist, a new wheel cylinder must be installed.

Assembly

1. Install the spring.

2. Using clean brake fluid, lubricate and install the 2 piston seals.

3. Install the 2 pistons.

4. Install the 2 dust boots.

5. Install the bleeder screw.

6. Apply a thin coat of silicone grease to the brake shoe contact points on the backing plate.

7. Install the trailing brake shoe and parking brake actuator lever assembly.

8. Install the leading brake shoe, the pins and the retaining springs.

9. NOTE: Adjust the self-adjuster to the full retracted position to ease the installation of the brake drum.

Install the self-adjuster and spring assembly.

NOTICE: Use only specified silicone based lubricant. Use of other lubricants may cause damage to piston seals.

10. With the brake shoe return springs removed, push the leading shoe into the wheel cylinder until the shoe bottoms out.

11. Pull back the wheel cylinder dust boot (opposite depressed shoe) and apply the specified lubricant around the wheel cylinder piston.
- Reposition the wheel cylinder dust boot.

12. Push the trailing shoe into the wheel cylinder until the shoe bottoms out.

13. Pull back the wheel cylinder dust boot (opposite depressed shoe) and apply the specified lubricant around the wheel cylinder piston.
- Reposition the wheel cylinder dust boot.

14. Once both wheel cylinder pistons have been lubricated, push the pistons side-to-side at least 3 times to distribute the lubricant and make sure of smooth movement.

15. Install the lower return spring.

16. Install the upper return spring.

17. Install the brake drum. For additional information, refer to Brake Drum Service and Repair.
- Adjust the rear brake shoes. For additional information, refer to Brake Shoe Adjustment Adjustments.

18. Bleed the wheel cylinder. For additional information, refer to Brake System - General Information Component Bleeding for Component Bleeding.