Master Cylinders & Parts

Harley Master Cylinders & Parts — Premium Brake & Clutch Master Cylinder Solutions

High-Quality Master Cylinders & Components for Harley Motorcycles

Welcome to Get Lowered — your go-to source for aftermarket Harley parts. Our Harley master cylinders & parts collection brings you a curated selection of top-tier master cylinders, reservoir kits, repair parts, and upgrade components designed to keep your braking (and clutch) system performing at its best. Whether you're restoring a classic or upgrading a modern ride, you’ll find parts to improve reliability, stop power, and overall ride safety. 

What is a Master Cylinder — And Why It Matters

A master cylinder is essentially the “heart” of a hydraulic brake (or clutch) system. When you press the brake lever or pedal, the master cylinder converts that mechanical force into hydraulic pressure, which is transmitted through brake fluid to the calipers or slave cylinders — ultimately clamping the brake pads onto the rotor to slow or stop the bike

On a motorcycle — including Harleys — proper master cylinder function is critical for safe braking performance. Faulty or worn master cylinders can lead to weak or spongy brakes, slow response, or even brake failure.

Upgrading to a high-quality aftermarket master cylinder or replacing worn components is often a smart move — whether you're building a custom bike, restoring an older model, or simply ensuring your brake system performs reliably on the road.

How to Choose the Right Master Cylinder for Your Build

1. Front vs. Rear — Know Your Brake Setup

Front master cylinders handle the majority of braking force on motorcycles. Rear master cylinders often control the foot-operated brake on touring models or act as auxiliary brake systems. Choosing the right one depends on your bike’s setup and brake configuration. A popular choice for performance Harletys when replacing the front Master is the Brembo Radial RCS Master Cylinder. 

2. Stock Replacement or Performance Upgrade

If you’re restoring a bike or replacing a worn unit, a stock-spec master cylinder assembly ensures safe, reliable braking. If you’re after improved brake feel, modulation, and faster response — consider performance-oriented or aftermarket upgrade master cylinders.

3. Maintenance & Repair Kits for Longevity

Brake and clutch systems use hydraulic fluid and seals that degrade over time. Investing in rebuild kits — including new seals, O-rings, pistons, and reservoirs — can restore proper brake performance and prolong the lifespan of your system.

4. Compatibility & Fitment

Always check year, model, and brake configuration for compatibility. We organize our parts catalog by bike model and part type to simplify this process.

Whether you’re maintaining your bike, restoring an older model, or building a custom ride, a quality master cylinder is foundational for safe and reliable braking. Explore our full selection of Harley master cylinders and parts today — and ride with confidence, control, and stopping power.