7/8 Bore Tall Rectangular Master Cylinder for 4 Wheel Brake

OVERVIEW

When you''re pushing a heavy-duty off-road sand rail or a performance-oriented Baja Bug to its limits, your braking system is the only thing standing between a controlled stop and a dangerous situation. The Latest Rage 7/8 Bore Tall Rectangular Master Cylinder is engineered specifically for those who demand high-volume fluid displacement and unwavering reliability. This "Tall" version of the classic rectangular master cylinder provides an increased reservoir capacity, ensuring that even under extreme angles or high-heat conditions, your braking system remains fully primed. This master cylinder is the go-to choice for custom 4-wheel brake setups where moving enough fluid to actuate multiple calipers or large wheel cylinders is critical for safety and performance.

The 7/8-inch bore size is the "gold standard" for builders who need a firm pedal feel without sacrificing the pressure required to lock up all four wheels in the dirt or on the street. Unlike smaller bore cylinders that might feel "mushy" when paired with larger disc brake conversions, this unit provides the hydraulic leverage necessary for aggressive stopping power. Designed to integrate seamlessly with most aftermarket pedal assemblies, including those from CNC, Neal, and Jamar, it features a vertical 12-to-6 o''clock mounting configuration. Whether you''re finishing a ground-up tube chassis build or upgrading your existing buggy''s hydraulic circuit, this master cylinder offers the robust construction and high-capacity reservoir needed for professional-grade braking performance.

FITMENT

This master cylinder is a universal performance component typically used in custom air-cooled VW-based applications and off-road vehicles. It is designed to fit most aftermarket floor-mount and hang-mount pedal assemblies. Common applications include:

• Sand Rails & Dune Buggies: All years and models utilizing custom aftermarket pedal kits.
• Baja Bugs: Custom builds featuring relocated master cylinders or hydraulic clutch/brake pedal clusters.
• Meyers Manx & Kit Cars: Ideal for fiberglass bodies where a remote or tall-style reservoir is preferred for accessibility.
• Off-Road Racing Frames: Compatible with Chenowth, Berrien, and Warrior chassis configurations.
• Aftermarket Pedals: Fits CNC, Jamar, Neal, and Latest Rage brand pedal assemblies with a 2-1/4 inch mounting pattern.

SPECS

• Brand: Latest Rage
• Bore Diameter: 7/8 Inch (0.875")
• Reservoir Style: Tall Rectangular (Increased Fluid Capacity)
• Application: Optimized for 4-Wheel Brake Systems (Also compatible with 2-wheel)
• Outlet Port: 1/8 Inch NPT (Requires NPT to Flare adapter for brake lines)
• Mounting Hole Spacing: 2-1/4 Inches Center-to-Center
• Mounting Orientation: 12 o''clock and 6 o''clock (Vertical)
• Fluid Type: USE WITH DOT 3 BRAKE FLUID ONLY
• Construction: High-strength cast alloy body with durable internal seals

PRO TIPS

1. Bench Bleeding is Non-Negotiable

Before you ever bolt this master cylinder into your chassis, you MUST perform a thorough bench bleed. Because of the tall rectangular design, air pockets can easily become trapped in the front of the bore. By securing the unit in a vise and cycling the piston with a screwdriver while submerged or using a loop-back kit, you ensure that only pure fluid enters your brake lines. Attempting to bleed this unit for the first time while it is mounted in the car often results in a "spongy" pedal that is nearly impossible to fix without starting over. Taking ten minutes to bench bleed will save you hours of frustration later.

2. Proper NPT to Metric/Flare Adaptation

This master cylinder uses a 1/8 inch NPT (National Pipe Thread) outlet. It is critical to remember that NPT threads are tapered and rely on the threads themselves to seal, unlike the bubble or inverted flare fittings found on stock VW hard lines. You will need a high-quality adapter to convert this 1/8 inch NPT port to your specific brake line size (typically 3/16 inch line with a 10mm x 1.0 or 3/8-24 flare). Use a small amount of thread sealant or PTFE tape specifically rated for automotive chemicals on the NPT side only, and be careful not to overtighten and crack the casting.

3. Fluid Compatibility and Seal Longevity

The internal seals in this Latest Rage master cylinder are specifically designed for DOT 3 brake fluid. We strongly advise against using silicone-based DOT 5 fluids or high-performance synthetic fluids unless they explicitly state compatibility with standard rubber seals. Using the wrong fluid can cause the internal cups to swell or deteriorate, leading to a catastrophic brake failure. Additionally, because this is the "Tall" version, keep an eye on your fluid levels during the first few runs; the extra volume is a safety net, but you should always ensure the cap seal is seated correctly to prevent moisture ingestion in humid or muddy off-road environments.