Genuine Rear Disc Brake Master Cylinder Assembly for Suzuki Gixxer Series – Heavy-Duty Hydraulic Rear Brake Pump (Alloy Matrix Construction | Left Side Bracket Drop-In Mounting)

Cross-Generation Universal Fit: Custom engineered as a flawless, drop-in replacement for Suzuki Gixxer 155, Gixxer SF, and Gixxer 250 lines.

High-Tensile Alloy Fluid Reservoir Housing: Cast from premium structural alloy to resist high-temperature degradation and impacts from flying road stones.

Zero-Leakage Internal Pressure Seals: Equipped with heavy-duty automotive-grade rubber cups and O-rings to secure pressure lines against fluid weeping.

Linear Hydraulic Pressure Transformation: Provides smooth, balanced distribution of hydraulic fluid to eliminate sudden rear-wheel lockups and optimize ABS cycles.

Pre-Lubricated Internals: Ready for direct installation out of the box with factory-seated internal return springs and plunger assemblies.

Direct Plug-and-Play Installation: Precision-machined mounting bolt recesses perfectly line up with the stock Suzuki footpeg assembly hanger bracket.

Restore Instant Rear Brake Bite and Eliminate Dangerous Pedal Fade

Riding your Suzuki Gixxer with a failing, leaking, or degraded rear master cylinder severely limits your stopping power and puts your road safety at risk. Across the entire Suzuki Gixxer lineup—including the naked Gixxer 155, the aerodynamically faired Gixxer SF, and the quarter-liter Gixxer 250—the rear braking system is highly relied upon for stabilizing the chassis through tight city corners and slowing down safely from high highway speeds. Over thousands of kilometers, heat expansion, moisture entry, and contaminated hydraulic fluid cause the internal rubber plunger seals to degrade. This leads to internal pressure loss, leaving you with a dangerously soft, \"spongy\" pedal that drops all the way down without engaging the brake pads.

Our premium Rear Disc Brake Master Cylinder Assembly Suzuki Gixxer 155, Gixxer SF, Gixxer 250 (SKU - MCASG250) provides a factory-spec, direct-fit solution to restore optimal stopping pressure to your rear brake caliper. Cast from a high-tensile, corrosion-resistant alloy matrix, this complete assembly houses a precision-ground internal piston and premium oil seals designed to withstand intense hydraulic pressure without leaking. Swapping out your worn rear pump assembly with this genuine spare instantly eliminates wobbly pedal play, guarantees linear hydraulic force distribution, and restores a sharp, crisp rear brake response.

How to Replace and Bleed Your Suzuki Gixxer Rear Master Cylinder:

Step-by-Step Installation & Bleeding Guide

Drain the Old System: Place a catch container beneath the rear brake caliper. Connect a clear hose to the bleeder valve, crack the valve open, and pump the brake pedal to drain the old brake fluid completely out of the lines.

Unmount the Old Assembly: Disconnect the fluid reservoir feed line and the main steel braided line banjo bolt from the top of the worn cylinder. Remove the two frame retention bolts holding the cylinder to the footrest hanger and slide out the pushrod pin.

Mount the New MCASG250 Pump: Align the new MCASG250 master cylinder onto the hanger frame. Reinsert and hand-tighten the mounting bolts firmly. Connect the reservoir line and attach the main brake line using fresh copper crush washers on the banjo bolt to prevent leaks.

Refill the Reservoir: Top up your brake fluid reservoir container with clean, fresh DOT 4 hydraulic brake fluid up to the maximum fill line.

Bleed out Air Traps: Open the caliper bleed valve slightly, press and hold the brake pedal down firmly, then close the valve before releasing the pedal. Repeat this process until clean, bubble-free fluid flows through the clear hose and a firm, progressive bite is restored to the pedal.