Wilwood residual pressure valve kit — 2 lb and 10 lb billet-aluminum valves, red anodized, includes fittings

Wilwood 26013784 Brake Kit is a pair of billet-aluminum residual pressure valves (2 lb and 10 lb) designed to maintain minimum brake-line pressure for disc and drum systems without causing drag.

This compact kit solves common brake feel and pedal travel issues by keeping a controlled amount of pressure in the lines. The lower-pressure (2 lb) valve prevents caliper pistons in disc systems from retracting too far when the master cylinder is mounted below the calipers, while the higher-pressure (10 lb) valve is intended for drum brake wheel cylinders to compensate for return-spring tension. Both valves are CNC-machined from billet aluminum, finished in red anodize, and come with fittings to adapt to most domestic 3/16" hard brake lines.

How does the 2 lb valve help disc brake systems?

The 2 lb residual pressure valve retains a small, controlled pressure in disc brake lines so caliper pistons do not back away from the rotor due to gravity or vibration. That controlled pressure shortens pedal travel and restores firmer, more consistent initial bite without causing brakes to drag. It’s particularly useful when the master cylinder sits lower than the calipers.

• Prevents fluid drain-back that leads to soft pedal feel
• Reduces excessive caliper piston retraction
• Maintains quicker pad-to-rotor contact on first application
• Designed for disc systems where master cylinder is below calipers

When should I use the 10 lb valve for drum brakes?

The 10 lb valve is calibrated to hold more pressure and is intended for drum brake wheel cylinders, where return spring force can allow fluid to leak past seals or cause inconsistent sealing. By keeping a moderate residual pressure, the valve helps ensure the wheel cylinder seals remain seated and reduces pedal travel while preserving free wheel rotation when released.

• Compensates for drum brake return spring tension
• Helps maintain wheel-cylinder sealing and consistent response
• Reduces excess pedal travel common in drum systems
• Suitable for classic cars, street rods, and vehicles with drum rears

What materials and fittings are included, and why do they matter?

Wilwood machines these valves from billet aluminum for durability, light weight, and corrosion resistance, then applies a red anodized finish for identification and protection. The kit ships with two 1/8-27 NPT to 3/-24 inverted flare female fittings, which adapt to most domestic 3/16" hard brake lines for straightforward installation without custom adapters.

• Billet aluminum construction for strength and longevity
• Red anodize finish for corrosion resistance and visual ID
• Includes two adapter fittings for common hard-line sizes
• Compact footprint for easy placement on brake lines or manifolds

How will installation affect brake balance and maintenance?

Installing residual pressure valves slightly alters the resting pressure in a circuit but is intended to improve initial pedal feel and prevent unwanted fluid return; it does not replace proportioning or balance components. Proper placement and using the correct valve (2 lb vs 10 lb) for each end is important to avoid drag and keep brake balance predictable. Routine inspection and proper bleeding procedures remain necessary to ensure safe operation.

• Use the 2 lb for disc calipers, 10 lb for drum wheel cylinders
• Follow proper brake-bleeding after installation to remove air
• Check for any signs of dragging during initial road tests
• Complementary to, not a substitute for, proportioning valves or ABS systems

Who is this for: The Wilwood 26013784 Brake Kit is aimed at enthusiasts and mechanics upgrading performance street cars, hot rods, drag vehicles, or off-road machines that need crisper pedal feel and reduced travel caused by fluid drain-back or spring tension. If you work on classic drum applications, high-mounted master cylinder setups, or any system experiencing excessive pedal travel, this kit provides a compact, durable solution that integrates with common hard-line fittings.