Master Cylinder Assembly – Hydraulic Disc Brake – 4-127-22
Complete OEM master cylinder assembly designed for hydraulic disc brake surge actuators. Includes master cylinder body (32291U) and piston / return spring kit (054-140-22), factory assembled and ready to install.
Common replacement for Dexter and Titan / Dico hydraulic disc brake actuators. Engineered for consistent hydraulic pressure and corrosion resistance.
Listing includes one complete master cylinder assembly.
Specifications
| Specification | Detail |
| Part Number | 4-127-22 |
| Includes | (1) 32291U Master Cylinder Body (1) 054-140-22 Piston & Return Spring Kit |
| Brake Type | Hydraulic Disc Brake |
| Fluid Port Size | 3/16" Inverted Flare – 3/8-24 Thread |
| Material | Aluminum Housing / Plated Steel Piston & Spring |
| Common Applications | Dexter DX Series, Titan / Dico Model 20 Disc, Aero 7500 Disc |
| Brake Fluid | DOT 3 or DOT 4 |
| Country of Manufacture | USA |
R&P Knowledge Hub
The master cylinder converts surge actuator movement into hydraulic pressure, sending brake fluid through the lines to activate disc brake calipers. A worn or leaking master cylinder can cause reduced braking performance, fluid loss, or inconsistent stopping.
When replacing a master cylinder, inspect the actuator housing, reservoir, gasket, and brake lines for wear or contamination. Always confirm actuator model compatibility and fluid port thread size before installation.
Features
- Direct OEM replacement – no modification required
- Factory-assembled with piston and spring kit installed
- Precision-machined bore for consistent brake pressure
- Designed for hydraulic disc brake surge actuators
- Compatible with DOT 3 and DOT 4 brake fluid
- Replaces older Dico / Titan references
Verify actuator model and port thread size before installation.
