AxleTech DXP 195 Air and Hydraulic Release Parking Disc Brakes Maintenance Manual
This maintenance manual provides comprehensive instructions for the service, repair, and adjustment of AxleTech International DXP 195 Air Release and Hydraulic Release Parking Disc Brakes.
1. Core Component Specifications
Proper brake performance depends on precise technical settings and wear monitoring:
- Brake Lining Clearance: The total clearance between the brake disc and both linings must 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: Linings must be replaced when the thickness of the lining material is worn down to 1/16 inch (1.50 mm).
- Disc Wear Limits: Replace the disc if it is worn more than .030 inches (0.76 mm) per side or if deep scratches/scoring exceed .010 inches (0.25 mm) in depth.
2. Key Maintenance and Assembly
- Safety Warning: Do not use high-pressure air hoses to clean brake assemblies, as this can create airborne dust containing hazardous fibers.
- Parts Preparation: Ground and polished metal parts must be cleaned with solvents like isopropyl alcohol, kerosene, or diesel fuel. Never use gasoline, water, or steam on these surfaces.
- Adjuster Screw Sealing: Apply silicone gasket material (e.g., Dow Corning 737) to the threads of the adjuster screws before final installation to ensure a proper seal.
- Lever Arm Position: During installation, the lever arm should be positioned at an angle of 75 to 90 degrees with the push rod of the air or hydraulic chamber.
3. Diagnostics and Troubleshooting
| Condition | Possible Causes |
| Brake Does Not Apply | Worn linings, frozen mechanical actuator, or an incorrectly adjusted lever. |
| Brake Does Not Release | Damaged return springs, seized brake head, or lack of release pressure in the actuator. |
| Brakes Dragging | Incorrect lever arm adjustment or debris between the linings and the disc. |