Description
Product Overview
The Wilwood Master Cylinder is a precision‑engineered brake component designed for high‑performance and daily‑drive applications. Constructed from machined aluminum, the unit combines strength with reduced weight, contributing to overall vehicle dynamics. It features a key‑lock mechanism that prevents unauthorized adjustments, ensuring consistent brake feel. The package includes an aluminum tandem‑chamber master cylinder, a combination proportioning valve, a mounting bracket, fluid tubes, tandem outlet, integral reservoir, and all necessary hardware for a complete installation. Dimensions are 12.2 x 12.2 x 5.51 inches and it weighs 2.48 kg (5.46 lb). The modern black finish complements a wide range of vehicle interiors.
Usage
Designed for both street and track environments, this master cylinder delivers reliable hydraulic pressure for front and rear brake circuits. It is ideal for sports cars, muscle cars, and any vehicle where brake modulation and safety are paramount. The key‑lock feature is especially valuable for fleet vehicles or race teams that require tamper‑proof components. Installation is straightforward with the included mounting bracket and hardware, making it suitable for professional mechanics and experienced DIY enthusiasts alike.

Why Choose Us
Wilwood’s reputation for engineering excellence ensures that each master cylinder meets rigorous quality standards. The aluminum construction resists corrosion and reduces unsprung weight, enhancing handling. Our key‑lock system adds a layer of security not commonly found in aftermarket brake kits. Every unit undergoes thorough testing for pressure tolerance and fluid compatibility, guaranteeing long‑term durability. With a 4.9‑star rating from 32 verified customers, the product demonstrates consistent satisfaction and reliability.
Key Features
- Aluminum construction provides lightweight strength and corrosion resistance.
- Key‑lock design prevents unauthorized adjustments for consistent brake performance.
- Integrated tandem chamber and proportioning valve simplify dual‑circuit brake setups.
- Complete installation kit includes bracket, fluid tubes, reservoir, and hardware.
- Modern black finish and compact dimensions fit a variety of vehicle designs.
FAQ
What brake fluid types are compatible?
The Wilwood Master Cylinder is compatible with DOT 3, DOT 4, and DOT 5.1 brake fluids. Always follow the vehicle manufacturer’s fluid specifications.
Can this master cylinder be used for a single‑circuit brake system?
Yes, the unit can be configured for single‑circuit applications by using the appropriate proportioning valve settings and plumbing.
Is the key lock replaceable if lost?
Wilwood provides replacement keys through authorized dealers. Contact customer support with the model number 261-13270-BK for assistance.
What is the warranty period?
Wilwood offers a limited 2‑year warranty covering manufacturing defects for this master cylinder.
How does the tandem chamber improve braking?
The tandem chamber separates front and rear circuits, ensuring that a failure in one circuit does not compromise the other, thereby enhancing safety and brake balance.





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