A-Premium Rear Drum Brake Wheel Cylinder for Silverado/Sierra 1500 — 15/16-inch Bore, Cast Iron

A-Premium rear drum brake wheel cylinder designed to replace OEM units on select Chevrolet Silverado and GMC Sierra 1500 models, featuring a 15/16" bore, cast-iron construction, and precision-tested sealing for reliable brake actuation.

This wheel cylinder is a direct-fit aftermarket replacement engineered for rear drum brake systems on specific Chevrolet Silverado and GMC Sierra 1500 model years. Built from cast iron with an M10 x 1.0 inlet thread and a 0.938-inch inside diameter (15/16" bore), the unit matches original equipment dimensions and mounting locations for rear driver and passenger sides. Each cylinder is pressure- and high-temperature tested to help ensure dependable performance when installed as part of a properly maintained braking system.

Which vehicles will this wheel cylinder fit?

This A-Premium wheel cylinder covers a range of Chevrolet and GMC 1500 models across mid-2000s model years. Fitment depends on cab configuration and whether the vehicle uses brake shoe hold down pins; verify your VIN or vehicle details before ordering.

• Chevrolet Silverado 1500 (various 2005–2007 and 2006–2007 extended/standard cab fitments)
• GMC Sierra 1500 (selected 2005–2008 standard and extended cab fitments)
• RPO code JF7 compatibility for certain listings; review special notes and reference numbers before purchase

What are the key specifications and included parts?

The cylinder is cast iron with precise thread and bore dimensions to match OEM connections and hydraulic fittings. It ships with the internal bleeder screw but does not include a bleeder screw cap; confirm all hose and fitting compatibility when replacing components.

• Inside diameter (bore): 0.938 inches (15/16")
• Brake component inlet thread size: M10 x 1.0; thread diameter: 10 mm
• Material: cast iron; bleeder screw included, bleeder cap not included
• Reference numbers: W610131, WC370180, 18E1402, 19261402, 89059126, 19133369

How is the part tested and what reliability measures are used?

A-Premium subjects each cylinder to pressure and thermal tests to confirm structural integrity and seal performance. Testing covers a wide pressure range and elevated temperature exposure to reduce the chance of premature failure under normal operating conditions.

• Pressure-tested from 0.2 MPa up to 20 MPa to verify hydraulic sealing
• High-temperature test at 120°C to assess thermal resilience
• Manufactured to match OEM dimensions for proper fit and function

How should I choose and install the correct cylinder for my vehicle?

Start by entering your vehicle year, make, model, and cab configuration on the product page to confirm compatibility. If unsure, compare OEM reference numbers or consult a trusted mechanic; correct selection and proper brake bleeding after installation are critical for safe braking performance.

• Check the listing’s special notes and enter vehicle info before ordering
• Compare reference numbers (listed above) to your existing part
• After installation, bleed the brake system and inspect for leaks before driving

Who is this for: Technicians, DIYers, and fleet owners seeking a durable, OEM-dimension replacement wheel cylinder for select Chevrolet Silverado and GMC Sierra 1500 rear drum brakes. Choose this part when you need a cast-iron cylinder with a 15/16" bore, M10 x 1.0 inlet thread, and factory-style fitment backed by pressure and temperature testing—ideal for restoring rear-brake hydraulic function on compatible mid-2000s trucks.