1974-1975 Dodge M-Series Brake Master Cylinder – Castings 2228671 / 29979-C
CRITICAL: Verify Specifications
Always verify the casting number and physical bore specifications on your original core before installation to ensure accurate fitment.
Product Specifications
- Bore Diameter: 1-1/4-inch bore size
- Application: Heavy-duty fleet, automotive, and commercial vehicles
Verified Casting Numbers
- 2228671
- 29979-C
- 30029-C
Application & Fitment Data
Model Years: 1974, 1975
Expert Installation & Field Note
Based on our shop experience specializing in heavy-duty brakes since 1985:
- Alignment: Ensure meticulous alignment with the booster pushrod and firewall linkage before mounting. A misaligned pushrod restricts the piston from returning to its fully open “at rest” position, keeping the compensating ports closed and locking up the front brakes.
- Bench Bleeding: Always complete a thorough bench-bleeding routine until all air bubbles vanish completely from both ports prior to final vehicle assembly to protect your internal seals from running dry.

















