hydroboost brake kit with Wilwood compact on a white background
GM hydroboost brake kit short master cylinder with text about optional wide open hydroboost brake light switch kit
Wilwood compact tandem master cylinder hydroboost with visible Wilwood branding on a white background
off-road hydraulic assist brake kit GM with metal mounts on a white background
Technical drawing of a rock crawler hydroboost brake system with dimensions labeled
hydroboost brake kit with Wilwood compact on a white background
GM hydroboost brake kit short master cylinder with text about optional wide open hydroboost brake light switch kit
Wilwood compact tandem master cylinder hydroboost with visible Wilwood branding on a white background
off-road hydraulic assist brake kit GM with metal mounts on a white background
Technical drawing of a rock crawler hydroboost brake system with dimensions labeled

Hydroboost Brake Kit - Wilwood Compact Master Cylinder

SKU: WA01008-WS

$1,010.99
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The Wide Open Design Wilwood HydroBoost Brake System is a high performance braking solution engineered for heavy off-road rigs and rock crawlers. By combining a space saving Wilwood Compact Master Cylinder with a powerful hydraulic-assist unit, it delivers massive stopping power and a consistent pedal feel for vehicles with large tires. This kit simplifies custom fabrication by providing a compact, "short version" system that fits into tight engine bays where traditional vacuum boosters fail.

Includes:

  • Wilwood 1-1/8" Bore Compact Tandem Master Cylinder with 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 attachment designed specifically for this hydroboost system, offering a clean and adjustable brake light activation solution.
Specifications
  • Application: HydroBoost systems
  • HydroBoost Fittings: -8 AN flow and return
  • Master Cylinder Bore (Standard): 1-1/8"
  • Mounting Bracket: Universal steel
  • Pedal Assembly: Adjustable front to back
  • Master Cylinder Weight: 3 lbs


    Wilwood Compact Tandem Master Cylinder Details

    • Bore Size: 1-1/8" (designed primarily for hydraulic or vacuum assisted power brake systems)
    • "Finish: Black e-coat
      • Mount flange compatibility: 3.22" – 3.40"
    Fitment
    • Designed for HydroBoost setups
    • Ideal for tube chassis builds, rock crawlers, and race rigs
    • Compatible with hydraulic assist or vacuum assisted systems (based on bore selection)

    Note: Professional installation recommended. Confirm steering pump capacity and brake line routing before installation.

    Tech Insight

    HydroBoost systems use hydraulic pressure from your power steering pump instead of engine vacuum. This makes them ideal for:

    • Big cam engines with low vacuum
    • Heavy 40+ tire builds
    • Full hydraulic steering setups
    • Ultra4 and rock crawling applications

    The compact Wilwood master cylinder reduces front end weight and frees up valuable firewall space that is critical in tight tube chassis builds.

    Works well with
    Back to Hydroboost Brake Kits