The Wilwood Compact Tandem Master Cylinder delivers a high performance, space saving solution for both manual and power-assisted brake systems. Designed with a lightweight high pressure die-cast aluminum body, this master cylinder weighs just 3 lbs, offering up to 75% weight savings compared to traditional cast iron OE units.

This 1-1/8" bore configuration is optimized for power brake applications, including vacuum-assist and hydraulic-assist systems. It features a tandem outlet design with ports on both sides of the bore, allowing flexible plumbing for custom builds. With a 1.10 stroke and a 2:1 primary to secondary volume ratio, it delivers balanced, predictable braking performance.

An integral dual reservoir keeps the package compact while maintaining adequate fluid capacity, making it ideal for tight engine bays in classic cars, trucks, off-road rigs, and race vehicles.

Includes:

• (1) Compact Tandem Master Cylinder
• Integral dual reservoir
• Black E-Coat finish
• Pushrod not included. Proportioning valve kits sold separately.

Specifications

• Manufacturer: Wilwood
• Master Cylinder Type: Tandem Outlet
• Bore Size: 1-1/8"
• Piston Area: 0.970 in
• Stroke: 1.10"
• Material: Aluminum
• Finish: Black E-Coat
• Weight: 3 lbs
• Outlets: (2)
• Outlet Size: 1/2"-20

Outlet Fitment Options:

• 3/8"-24 Inverted Flare
• 1/2"-20 Inverted Flare
• 9/16"-18 Inverted Flare

Dimensions:

• Overall Length: 7.16"
• Flange to End Length: 6.55"
• Overall Height (Bore Centerline to Top): 3.03"

Reservoir Capacity:

• Front / Rear: 7.8 oz / 4.7 oz
• Volume: 14.0 cu in / 8.5 cu in

Fitment

• Designed for power brake systems (vacuum or hydraulic assist)
• Mount flange spacing: 3.22" 3.40" (common on most domestic cars & trucks mid-1960s to present)
• Ports available on both sides of the master cylinder body
• Verify bore size and outlet configuration based on brake system requirements.

Tech Insight

The Compact Tandem Master Cylinder is ideal when space and weight matter. Its die-cast aluminum construction improves pressure handling while reducing mass, and the short 6.55" flange-to-end length allows fitment in cramped engine compartments. Pairing this master cylinder with Wilwoods combination proportioning valve kits simplifies plumbing and ensures proper front-to-rear brake bias.