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Brake Master Cylinder
The brake master cylinder is the hydraulic pump that converts pedal pressure into hydraulic pressure for the brake calipers and wheel cylinders.
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Buying Guide
Brake Master Cylinder Buying Guide
The brake system is safety-critical — parts must be in excellent condition and properly matched. This guide covers the major brake assemblies and components from complete corner assemblies to calipers, boosters, and ABS hardware.
Complete brake assemblies — front brakes and rear brakes — typically include the rotor and caliper or drum as a ready-to-install unit. This is the fastest solution when multiple components are worn.
Individual components — such as the caliper — let you replace just what's worn. This is more economical when other parts are still in good condition.
Front Brakes and Rear Brakes
A "Front Brakes" or "Rear Brakes" listing is the complete corner assembly. Front brakes do the majority of stopping work and wear faster. Rear brakes may be disc or drum depending on the vehicle. Confirm whether your vehicle uses front/rear disc or rear drum before ordering.
For safety-critical components like brake calipers, we strongly recommend new or remanufactured over used salvage units. Remanufactured calipers have been rebuilt with new seals, pistons, and hardware — and typically include a warranty and core charge. Used calipers may have corroded pistons or failed seals that aren't visible until installed.
If purchasing a used caliper, ensure the piston moves freely (use a C-clamp to push it back) and the bleeder screw is not seized.
These are fail-together components in many cases. If the master cylinder has failed internally, inspect the booster for fluid intrusion — fluid in the vacuum port means the master seal has failed into the booster. Similarly, a collapsed booster diaphragm can draw brake fluid into the engine.
Safety note: After replacing the master cylinder, bench-bleed it before installation to prevent air locks in the system.
Anti-lock brake (ABS) components include the modulator/pump assembly and the wheel speed sensors. Wheel speed sensors are individual and side-specific. The ABS modulator is VIN-coded on many vehicles and may require programming after installation.
Always replace brakes in axle pairs — both front calipers together, or both rear. Replacing only one side creates imbalanced braking force and can cause dangerous pulling under braking.
Any time a hydraulic brake component is opened — caliper, line, or master cylinder — the system must be bled to remove air. Air in brake lines causes a spongy pedal and dramatically reduced stopping power.
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ShopEarl.com is a network of American auto part suppliers - salvage yards, aftermarket vendors, and powertrain remanufacturers.
Our mission is to make finding the right auto part easy, affordable, and environmentally friendly by giving quality used parts a second life and keeping them out of landfills.
We use a comprehensive vehicle fitment database that matches parts to specific makes, models, years, and engine types.
For critical components like engines and transmissions, we also require VIN verification for your vehicle to ensure an exact match. The VIN (Vehicle Identification Number) contains specific information about your vehicle's configuration that helps identify the exact parts it needs.
If you're ever unsure about fitment, our team is available to help verify compatibility before you make a purchase.
ShopEarl.com accepts the following payment methods:
- Major credit and debit cards, including Visa, MasterCard, and American Express
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All payment data is encrypted using TLS technology. We never see or store your full payment information—only a secure token provided by our processor to complete your purchase.
ShopEarl.com offers free shipping within the continental United States. Shipping times can vary depending on shipping methods, and ‘unbolted’ used parts typically ship a day faster than ‘yard’ parts that have to be professionally dismantled from the vehicle first. You’ll receive email and text notifications every step of the way.
Delivery to commercial locations is always free, but larger parts that ship freight may incur surcharges if they are delivered to a residential address. You can always ship these for free to a repair facility or our team can help find a nearby commercial address for local pickup.
At the moment, we don’t offer expedited shipping options. However, we’re always looking for ways to improve our services, and we hope to offer faster shipping options in the future.
All parts come with a minimum 30 day return window from the date your part arrives. See full return policy for all the details.
A core charge is a refundable fee charged when you buy a part that can be rebuilt or remanufactured, like an engine, alternator, or transmission. It works like a deposit:
- You pay the core charge upfront when you buy the part.
- After installing the new part, you return the old part (the “core”) to the seller.
This system encourages recycling and helps manufacturers refurbish used parts instead of making new ones from scratch.
Used parts are OEM auto parts professionally dismantled by certified auto recyclers.
Remanufactured parts are used OEM parts that have been completely disassembled, cleaned, and rebuilt with new components where necessary. They're tested to meet or exceed original equipment specifications, and often come with warranties similar to new parts.
New parts are new, aftermarket components that have never been installed on a vehicle.