Close-up of the 3/4 inch bore on the ABC Dynamics master cylinder for manual brakes.

Bottom view of the ABC Dynamics brake master cylinder, showing the stamped casting number 29891-C.

Side view of the ABC Dynamics manual brake master cylinder with the included pushrod.

Diagram showing the 3/4" bore and 5.51" pushrod length of the manual brake master cylinder.

ABC Dynamics Brake Master Cylinder for Manual Brakes with a 3/4" bore. Title: Manual Brake Master Cylinder | Replaces 29891-C

Top view of the ABC Dynamics manual brake master cylinder showing the fluid reservoir.

Close-up of the included 5.51-inch pushrod for the ABC Dynamics manual brake master cylinder.

ABC Dynamics Brake Master Cylinder for Manual Brakes with a 3/4

New Brake Master Cylinder 3/4-inch bore size 29891-C 5470819 5470876

Name: New Brake Master Cylinder 3/4-inch bore size 29891-C 5470819 5470876
Brand: Bexar Pro Componets
SKU: M7616648
Availability: InStock

$143.55

Fitment Lookup:

Select your vehicle to verify compatibility before ordering.

SKU: M7616648 Category: Brake Master Cylinders Brand: Bexar Pro Componets

New Brake Master Cylinder 3/4-inch bore size 29891-C 5470819 5470876

Bexar Pro Components: Heavy-Duty Reliability for Fleet & Industry.

Restore the reliable stopping power of your hydraulic system with the M7616652 Master Cylinder from Bexar Pro Components. Engineered with a precision 3/4-inch bore and high-grade materials, this unit is built for heavy-duty fleet reliability, making it the ideal solution for both industrial equipment and specialized automotive applications utilizing power assist systems.

Key Specifications & Expert Features

Bore Diameter: 3/4-inch bore size (Critical for correct power-assist pedal ratios)
Outlet Sizes: 9/16″-18 & 1/2″-20 INV (Standard dual-line configuration)
Components: Unit includes a new pushrod for simplified installation.
Application: Optimized for power brake systems in classic trucks and light commercial fleets.
Repair Kit: N/A (Complete unit replacement recommended for power-assist safety)

Verified Casting & Part Numbers

Matching your existing casting number is the most reliable method to ensure correct fitment. This unit replaces:

29891-C
5470819
5470876
5470878
C5470878
C5470876

Expert Installation & Field Note

Based on our shop experience specializing in heavy-duty brakes since 1985: The smaller 3/4-inch bore size is specifically engineered to work with the low-pressure input from a brake booster, providing a firm, responsive pedal feel. When installing the M7616652, verify your pushrod alignment to ensure the internal piston travels squarely within the bore. Using this master cylinder in a manual (non-power) brake system will result in excessive pedal travel and unsafe performance.

⚠ CRITICAL: Verify Specifications

To ensure safety, verify that this master cylinder is for Power Brake Applications ONLY. Physically verify that the 3/4-inch bore size and outlet threads match your existing unit exactly before purchasing.