A-Premium Brake Master Cylinder with Reservoir & Sensor for Chevy GMC Cadillac 2009-2014 — 1.25" Bore, Aluminum Alloy

The A-Premium brake master cylinder is a complete aluminum alloy assembly with reservoir and sensor engineered to replace the original unit on select Chevy, GMC and Cadillac trucks and SUVs from 2009–2014.

This direct-fit replacement assembles the reservoir, pressure sensor and the 1.25-inch bore master cylinder into one packaged unit so you can restore brake system function without modifying lines or fittings. Built from 101 aluminum alloy and supplied in a protective box, the part matches factory thread sizes and outlets for straightforward installation on vehicles with active brake control options (RPO JL4/JD9 fitments noted). A-Premium backs the unit with a one-year unlimited-mileage guarantee for added confidence.

Will this master cylinder fit my Silverado, Sierra, Tahoe, Yukon or Escalade?

Compatibility targets specific model years and option codes—verify your vehicle’s RPO before purchasing. The assembly fits many 2009–2014 full-size GM trucks and SUVs, including examples equipped with Active Brake Control (JL4) and certain JD9 configurations.

• Compatible models include Silverado 1500, Sierra 1500, Tahoe, Suburban 1500, Yukon, Yukon XL 1500, Avalanche, and Escalade variants listed for 2009–2014.
• Fits Silverado/Sierra 2009–2013 when equipped with RPO JL4; also covers 2014 models noted in the product fit list.
• Specific Escalade fitment: 2009–2014 Escalade, Escalade ESV, and Escalade EXT per the listing years.

What are the key specifications and hardware details?

This master cylinder assembly uses aluminum alloy construction and factory-matching outlet threads to ensure durability and compatibility. The bore diameter and outlet thread sizes mirror OE dimensions for reliable hydraulic performance.

• Material: Aluminum Alloys 101 for corrosion resistance and strength.
• Bore diameter: 1.25 inch for correct hydraulic displacement.
• Rearward and secondary outlet thread sizes: M14 x 1.5 to match factory brake line fittings.
• Includes reservoir and pressure sensor in the packaged assembly for a single replacement unit.

How simple is installation and what comes in the box?

The A-Premium unit arrives boxed with the reservoir and sensor preassembled to reduce install time versus sourcing parts separately. Basic brake-line knowledge and standard shop tools are required; bleeding the system after installation is necessary to remove air and restore full braking performance.

• Package contents: 1x brake master cylinder, reservoir pre-attached, sensor included, shipped in protective box.
• Direct-fit outlets and thread sizes reduce the need for adapters or modifications.
• Installation tip: follow vehicle-specific service procedures for safe brake bleeding and torque specs.

Who is this for: This master cylinder assembly is intended for owners and technicians replacing a failing or leaking master cylinder on compatible Chevy, GMC and Cadillac full-size trucks and SUVs from the listed model years who want a single, OE-style replacement with reservoir and sensor included. It’s suitable for fleet maintenance, repair shops and DIY mechanics comfortable with brake system service and vehicle RPO verification. If your vehicle matches the fitment list and option codes, this A-Premium assembly gives a direct-replacement path backed by a one-year unlimited-mileage guarantee for peace of mind.