What is the bore size of this master cylinder?

This Wilwood master cylinder features a 7/8-inch bore. It is also available in a 15/16-inch bore size, but this specific part number is 7/8-inch.

Does this master cylinder come with a proportioning valve?

No, this master cylinder does not include a proportioning valve. Wilwood does offer separate proportioning valve kits designed to work with this master cylinder, such as part numbers 260-13190 or 220-13189.

What is the weight savings compared to an original master cylinder?

This aluminum master cylinder weighs only 3 pounds. This typically offers a weight saving of about 75% compared to original cast iron master cylinders.

Wilwood 7/8in Black Tandem Master Cylinder 260-12900-BK

Name: Wilwood High Volume Tandem M/C - 7/8in Bore Black-W/Pushrod - Early Mustang
Brand: Wilwood
SKU: wilwood-wilwood-high-volume-tandem-m-c-7-8in-bore-black-w-pushrod-early-mustang-t14-136500
Price: 328.16 USD
Availability: BackOrder

Wilwood High Volume Tandem M/C - 7/8in Bore Black-W/Pushrod - Early Mustang

$328.16

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Wilwood 7/8in black tandem master cylinder for early Mustangs. Lightweight aluminum construction and includes the correct pushrod for manual brake pedals.

Key Features

Fits 1964-1972 Ford Mustangs with manual brake pedals.
Includes the correct pushrod assembly for factory brake pedals.
Features a 7/8-inch bore size.
Durable black e-coat finish.
Lightweight aluminum construction weighs only 3 lbs, offering significant weight savings over cast iron units.
Designed for manual brake applications.

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Product Details

This Wilwood High Volume Tandem Master Cylinder kit comes with the correct pushrod assembly, ready to install on your early Mustang. It features a 7/8-inch bore and a durable black e-coat finish. This master cylinder is primarily intended for manual brake applications and is designed to work with the factory brake pedal found in 1964 through 1972 Mustangs.

Wilwood machines these master cylinders from high-pressure die castings, resulting in a lightweight aluminum unit that weighs only 3 pounds. This is a significant weight saving, often around 75% less than heavier cast iron original equipment master cylinders. The unit is built for mount flanges ranging from 3.22 to 3.40 inches, matching the original manual master cylinder mount on 1964-1972 Mustangs. It also offers fluid outlet ports on both sides of the bore for flexible line routing. The internal design sets the stroke at 1.10 inches with a 2:1 volume ratio between the primary and secondary chambers, ensuring consistent braking performance.

For those looking to complete their brake system upgrade, Wilwood offers a combination proportioning valve kit, available separately, which includes brackets and stainless steel lines specifically designed to work with this master cylinder.