3/4 Bore Rectangular Master Cylinder, for 4 Wheel Brakes

OVERVIEW

When you are pushing your air-cooled beast through the dunes or carving corners in a custom street rod, your braking system is the only thing standing between a thrilling ride and a costly mistake. The Latest Rage 3/4 Bore Rectangular Master Cylinder is engineered specifically for high-performance 4-wheel braking systems where volume and pressure must be perfectly balanced. This isn''t just a replacement part; it''s a critical upgrade for enthusiasts running CNC, Neal, or Latest Rage pedal assemblies. By utilizing a 3/4-inch bore, this master cylinder provides the necessary hydraulic leverage to actuate four wheel cylinders or calipers effectively, ensuring a firm pedal feel and consistent stopping power even under the most demanding off-road conditions.

Crafted with precision and designed for longevity, this rectangular master cylinder features a robust reservoir design that simplifies fluid monitoring and maintenance. The vertical mounting configuration, with holes set at 2-1/4 inches on center, allows for a seamless fit into professional-grade sand rail and dune buggy chassis. At Appletree Automotive, we understand that off-road environments are unforgiving, which is why we recommend this unit for its proven reliability in custom Volkswagen-based builds. Whether you are finishing a ground-up Baja bug restoration or refreshing the hydraulics on a long-travel sand car, this master cylinder delivers the professional-grade performance that air-cooled specialists demand. Remember, this unit is specifically designed for use with DOT 3 brake fluid to maintain the integrity of the internal seals and ensure a long service life.

FITMENT

• Custom Dune Buggies: Ideal for all fiberglass body buggies using aftermarket hanging or floor-mount pedal clusters.
• Sand Rails & Woods Buggies: Perfect for lightweight off-road chassis requiring independent 4-wheel braking control.
• Baja Bugs: Suitable for heavily modified Type 1 Beetles converted for off-road racing with custom pedal assemblies.
• Pedal Assembly Compatibility: Direct replacement for CNC, Neal, and Latest Rage brand master cylinders.
• Universal Application: Can be adapted to any custom vehicle using a vertical 2-bolt mounting pattern (12 to 6 o''clock position).

SPECS

• Bore Diameter: 3/4 Inch (0.750").
• Reservoir Style: Integrated Rectangular Reservoir.
• Mounting Pattern: 2-1/4 Inches On-Center.
• Mounting Configuration: 12 to 6 o''clock (Vertical).
• Overall Length: 9 Inches.
• Overall Height: 4-1/2 Inches.
• Fluid Compatibility: USE WITH DOT 3 BRAKE FLUID ONLY.
• Application: Designed for 4-Wheel Braking Systems.
• Material: High-strength cast alloy body with precision-machined internals.
• Outlet Port: Standard threaded port for high-pressure brake lines.

PRO TIPS

Bench Bleed Before Installation

One of the most common mistakes builders make when installing a new master cylinder is trying to bleed the entire system starting at the wheel cylinders. For this 3/4 bore rectangular unit, you MUST bench bleed it first. Secure the master cylinder in a vise (using soft jaws), fill the reservoir with fresh DOT 3 fluid, and use a pushrod or large screwdriver to slowly cycle the piston until all air bubbles stop appearing in the reservoir. This ensures the internal chambers are fully primed. If you skip this step, you might spend hours chasing a "spongy" pedal that simply has a stubborn air pocket trapped inside the master cylinder bore.

Check Your Pushrod Clearance

When mounting this master cylinder to your CNC or Latest Rage pedal assembly, pay close attention to the pushrod adjustment. There should be a tiny amount of "free play" (roughly 1/16th of an inch) between the pushrod and the master cylinder piston when the pedal is at rest. If the pushrod is too long and constantly applies pressure to the piston, the "compensating port" inside the master cylinder will remain closed. This prevents fluid from returning to the reservoir, which causes your brakes to "drag" and eventually lock up as the fluid heats up and expands. Always double-check that the piston can return fully to its seat.

Never Mix Brake Fluids

This master cylinder is strictly designed for DOT 3 brake fluid. Many off-roaders are tempted to use DOT 5 (silicone-based) fluid because it doesn''t absorb water or damage paint. However, the internal seals in this specific Latest Rage unit are optimized for glycol-based DOT 3 fluid. Mixing fluid types or using the wrong specification can cause the seals to swell, soften, or disintegrate entirely, leading to total brake failure. Stick to high-quality DOT 3, and perform a full system flush every two years to keep the moisture content low and protect your investment from internal corrosion.