Hydroboost Brake Kit - Wilwood Master Cylinder
SKU: WA01008-W
The Wide Open Design HydroBoost Brake Kit with Wilwood Master Cylinder is one of the most effective ways to improve stopping power, especially on heavy off-road rigs running large tires, 1-ton axles, and full hydraulic steering.
This Wilwood HydroBoost Brake system is engineered specifically for custom fabrication builds and now paired with a lightweight, high performance Wilwood master cylinder. Delivering consistent pedal feel, increased brake assist, and cleaner plumbing this is an all in one solution that saves on weight and space for your off-road build.
Includes:
- Wilwood Master Cylinder (1-1/8" bore)
- Brake fittings
- HydroBoost unit modified in house for optimized flow and return with -8 AN fittings
- Universal steel mounting bracket
- In house fabricated pedal assembly (fully adjustable front to back)
Optional Add-On:
-
Hydroboost Brake Light Switch Kit
A bolt-on accessory designed specifically for this hydroboost system, providing a seamless and adjustable brake light activation solution.
Specifications
- Application: HydroBoost systems
- HydroBoost Fittings: -8 AN flow and return (in-house modified)
- Master Cylinder Bore: 1-1/8"
- Mounting Bracket: Universal steel
- Pedal Assembly: Adjustable front-to-back
- Master Cylinder Weight: 3 lbs
Additional Specifications:
-
- Mount flange compatibility: 3.22" – 3.40"
- Dual-side fluid outlet ports for flexible plumbing
- Stroke: 1.10"
- Volume ratio: 2:1 (primary to secondary chambers)
- Weight: 3 lbs (approximately 75% lighter than OE cast iron units)
- Machined from high-pressure die cast aluminum
Fitment
- Designed for HydroBoost style systems
- Ideal for tube chassis builds
- Compatible with rock crawlers, Ultra4-style rigs, and off-road race vehicles
- Requires hydraulic power steering pump supply
Professional installation recommended. Verify steering pump output, brake line routing, and pedal geometry during installation.
Tech Insight
HydroBoost systems use hydraulic pressure from your power steering pump instead of engine vacuum to provide brake assist. This makes them ideal for:
- Big cam LS engines with low vacuum
- High-altitude wheeling
- Heavy 40+ tire builds
- Full hydraulic steering setups
Pairing this system with a Wilwood aluminum master cylinder reduces front end weight while improving packaging flexibility. The dual outlet ports simplify plumbing in tight chassis layouts, especially in tube chassis buggies where space is limited.
This kit was engineered by off-road fabricators who understand what works under real trail abuse.