AxleTech Dry Disc Park Brake Maintenance Manual
This maintenance manual provides comprehensive instructions for the service and repair of AxleTech International Dry Disc Parking Brakes, specifically focusing on the mechanical caliper-style parking brake.
Core Technical Specifications
Proper operation and assembly rely on specific technical adjustments:
- Brake Lining Clearance: The total clearance between the brake disc and both linings should be adjusted to .020–.040 inches (0.50–1.00 mm).
- Disc Runout: The maximum allowable lateral runout for the brake disc is .010 inches (0.25 mm).
- Lining Wear Limits: Brake linings must be replaced when the lining thickness is worn down to 1/16 inch (1.50 mm).
Key Maintenance Procedures
- Lining Replacement: The manual details steps for removing the brake head and spacers to access and replace the brake linings.
- Disc Service: If a brake disc is damaged beyond a depth of .010 inches (0.25 mm), it must be replaced. Disc thickness should not be reduced by more than .030 inches (0.76 mm) per side if machining is required.
- Parts Preparation: Ground and polished parts must be cleaned with solvent (kerosene or diesel), never water or steam, to prevent damage.
Safety and Operational Highlights
- Safety Warning: Technicians are cautioned never to use a high-pressure air hose to clean brake assemblies, as this can create airborne dust that may contain hazardous fibers.
- Brake Dragging: Common causes for brake dragging include an incorrectly adjusted lever arm, damaged return springs, or a seized brake head.
- Brake Application Issues: If the brake does not apply, it may be due to worn linings, an incorrectly adjusted lever, or a seized mechanical actuator.