Description
Aeroflow Adjustable Combination Brake Proportioning Valve
Precision brake bias adjustment with an integrated hydraulic brake light switch for custom and high-performance braking systems.
The Aeroflow AF300-148 combination proportioning valve simplifies brake system plumbing and bias adjustments on custom, race, and performance builds. Engineered for tandem master cylinder setups, this compact block maintains full isolation between front and rear fluid circuits while providing precise rear pressure adjustment via an easily accessible rotary control knob.
Finished in durable black anodising, the unit features a built-in electric brake light switch triggered by hydraulic fluid pressure. The front brake circuit offers a single inlet with dual outlets (allowing direct split plumbing to front calipers or single-outlet operation with one port plugged), while the rear circuit features a single inlet and single outlet with adjustable proportioning. All ports accept standard 3/8″-24 female inverted flare fittings for 3/16″ hard brake lines.
Key Features
- ☑ Integrated Brake Light Switch: Built-in hydraulic switch activates brake lights directly from system pressure.
- ☑ Circuit Isolation: Preserves full fluid separation between front and rear circuits for maximum dual-circuit safety.
- ☑ Flexible Front Outlets: Dual front outlets allow direct line splitting to left and right calipers or single line connection.
- ☑ Fine Rear Bias Adjustment: Top knob permits exact metering of rear brake line pressure to prevent rear lockup.
- ☑ Billet Aluminium Build: Sleek black anodised finish protects against fluid corrosion and adds a clean engine bay aesthetic.
Technical Specifications
| Brand | Aeroflow Performance |
|---|---|
| MPN | AF300-148 |
| Material / Finish | Billet Aluminium / Anodised Black |
| Port Thread Size | 3/8″-24 Inverted Flare Female |
| Brake Line Size | 3/16″ Hard Line |
| Front Ports | 1 Inlet / 2 Outlets |
| Rear Ports | 1 Inlet / 1 Outlet (Adjustable) |
| Brake Light Switch | Hydraulic Switch Included |
What’s Included in the Box
- 1 x Aeroflow AF300-148 Adjustable Combination Proportioning Valve (Black)
- 1 x Integrated Hydraulic Brake Light Switch
- 1 x Port Plug (for optional single front outlet routing)
- 2 x Wiring Terminals for Hydraulic Switch
Built to exacting motorsport standards, Aeroflow Performance components offer premium quality and reliable fluid control under extreme driving conditions. Contact JP Racing for fitment guidance, optional master cylinder mounting brackets (AF300-149), and fast UK dispatch.
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