Pacbrake PRXB Exhaust Brake Kit – Complete Description

Pacbrake’s PRXB (Pressure Regulated Exhaust Brake) is one of the most powerful and reliable exhaust brakes available. Designed to help slow down your vehicle without relying on the service brakes, the PRXB improves safety, reduces wear on your braking system, and gives you better control when towing or driving in hilly terrain.

Unlike regular exhaust brakes that only work well at high RPMs, the PRXB starts working as early as 1200 RPM and maintains strong braking power throughout the full RPM range. This means smoother deceleration, shorter stopping distances, and better protection for your transmission and brakes.

Key Features:

• Strong, consistent braking power from 1200 RPM to max RPM

• Stainless steel sealed air cylinder for long-lasting performance

• Automatically adjusts at low RPMs for smooth operation

• Built-in safety feature to prevent overpressure

• 90° closing butterfly valve with no contact for durability

• Arcor nitride-coated housing and parts for corrosion resistance

• Free-flow design when the brake is not engaged

• Precision-fit surface for easy installation

• Compatible with stock exhaust systems

What’s Included:

• PRXB Exhaust Brake

• HP325 Series Air Compressor

• 1/2 Gallon Air Tank

• 25 ft. Coiled Air Hose

• Air Accessories & Fittings Kit

• ECM Bypass

Important Notes:

• For trucks with aftermarket turbochargers or if the factory cast elbow has been removed, an in-line kit must be used. You also need to add a mounting group to your kit.

  • 4″ Exhaust – Use Kit C11400

  • 3.5″ Exhaust – Use Kit C11420

  • 3″ Exhaust – Use Kit C11440

• Automatic transmission trucks require a torque converter lockup for proper operation.

This kit is ideal for towing and hauling, giving you peace of mind and better control on the road. If you’re looking for a powerful, proven exhaust brake system, Pacbrake’s PRXB is a top choice.

Does not ship to California