Master Cylinder Repair Kit 253MK – Fits M8716721 / M3440374
Bexar Pro Components: Heavy-Duty Reliability for the Long Haul.
Ensure maximum hydraulic integrity with this brand new **Master Cylinder Repair Kit (253MK)** from **Bexar Pro**. This rebuild package is precision-engineered to meet the rigorous demands of **heavy-duty automotive** fleets and commercial equipment, providing a balanced solution for both highway vocational vehicles and industrial applications.
Key Specifications
- Condition: NEW Repair Components
- Configuration Note: 2 kits may be required for dual piston applications
- Warranty: No warranty on internal replacement parts
- Application: Suitable for medium-duty trucks and heavy-duty hydraulic units
- Installation Guide: Master Cylinder Replacement Guide
Verified Part Number Compatibility
These components are a confirmed fit for the following master cylinder part numbers:
- M8716721
- M3440374
Expert Installation & Field Note
Drawing from our shop experience specializing in heavy-duty brakes since 1985, the most common reason for a master cylinder failing right after a rebuild is internal leaking caused by over-extending the internal cup during bench bleeding. To ensure long-term reliability, always use short, controlled strokes. Additionally, verify that the master cylinder bore is completely free of pitting or vertical scoring before installing the 253MK components. Proper pushrod alignment is critical to prevent premature seal wear and maintain consistent pedal feel.
CRITICAL: Verify Specifications
Components may differ from the photo due to manufacturer updates. Always verify all contents against your specific unit requirements before assembly.
⚠️ CLUTCH WARNING: Do NOT use the check valve in a clutch master cylinder application if there was not one installed originally.
SKU: 253MK
| Weight | 1 lbs |
|---|---|
| Dimensions | 8 × 6 × 1 in |
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