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Sentinel Exhaust Brake for 1989–1998 Dodge 5.9L Cummins (12-Valve) Heavy Duty

The Sentinel Heavy Duty Exhaust Brake delivers powerful, fully automated exhaust braking for 1989–1998 Dodge trucks equipped with the 5.9L 12-valve Cummins, reducing brake fade, protect service brakes, and maintain safer downhill speeds when towing or hauling. While the 12-valve Cummins is known for its durability and torque, these trucks rely entirely on service brakes from the factory. The Sentinel Heavy Duty exhaust brake provides stronger, more sustained engine braking for trucks equipped with performance turbochargers, upgraded injection systems, or used for frequent towing and demanding applications—all without air systems, ECM or TCM programming, or over complex electronics. Built with larger internal components and a high-torque worm-drive motor, the Heavy Duty Sentinel is designed to operate reliably under increased exhaust flow and endure frequent towing and commercial use. Installation is straightforward—often completed in under an hour—and every system is backed by a lifetime warranty.

Categories: CUMMINS, 1989–1998 Dodge 5.9L Cummins (12-Valve), Dodge/Ram
SKU: 899859DC12

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$1,650.00

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Description

Sentinel Exhaust Brake – Heavy Duty (12-Valve Cummins)

Heavy-duty electric inline exhaust brake designed specifically for 1989–1998 Dodge 5.9L 12-valve Cummins engines. Sentinel delivers strong, sustained exhaust braking to improve downhill safety, reducing brake fade, and protect service brakes when towing or hauling heavy loads.

  • Heavy Duty electric inline exhaust brake — no air system required
  • Designed for mechanical 12-valve Cummins engines
  • Engineered for performance turbochargers and upgraded injection systems
  • Larger internal components for increased durability
  • High-torque worm-drive electric motor
  • Maximum braking authority for sustained use
  • No ECM or TCM programming required
  • Backed by a lifetime warranty

Buy Heavy Duty!

Performance & Use Case

The Sentinel Heavy Duty Exhaust Brake is ideal for 12-valve Cummins trucks equipped with:

  • Performance or aftermarket turbochargers
  • Upgraded injection pumps or fueling systems
  • Frequent towing or heavy hauling loads
  • Work-truck or commercial applications
  • Long downhill grades and mountainous terrain

This Heavy Duty version is engineered to provide stronger, more sustained exhaust braking where increased exhaust flow and higher engine output demand greater braking capacity.

SAFETY

Engine Braking Designed for Demanding Descents

Higher exhaust flow, heavy trailers, and long downhill grades place extreme demands on braking systems—especially on older diesel trucks.

The Sentinel Heavy Duty Exhaust Brake enhances safety by:

  • Maintaining better speed control on long descents
  • Reducing brake overheating and fade
  • Lowering wear on service brakes
  • Improving driver confidence under heavy load

By slowing the engine instead of relying solely on wheel brakes, Sentinel provides safer, more predictable braking performance.

HOW SENTINEL WORKS

Simple Electric Exhaust Braking

Sentinel uses a heavy-duty electric inline valve to create controlled exhaust back pressure, slowing the engine during deceleration.

Key advantages include:

  • No air compressors or air lines
  • Independent operation from engine electronics
  • Reliable braking for mechanical fuel systems
  • High-torque, gear-reduced worm-drive motor

This design makes Sentinel especially well-suited for classic mechanical diesel platforms like the 12-valve Cummins.

INSTALLATION

Straightforward Installation — Often Under an Hour

Sentinel is designed for easy installation using basic tools.

Typical installation includes:

  1. Inline exhaust brake mounting
  2. Wiring routing
  3. Controller connection

Despite its Heavy Duty rating, installation is similar to the Standard version and does not require special equipment.

INFORMATION

Throttle-Activated Automation (Optional)

Because the 5.9L 12-valve Cummins uses a mechanical throttle, Sentinel exhaust brakes can be automated using an optional micro switch that activates the exhaust brake in sync with throttle movement.

This allows the exhaust brake to:

  • Engage automatically during deceleration
  • Disengage smoothly with throttle input
  • Provide more consistent braking during heavy towing

The micro switch is sold separately and can be added during or after installation.

DURABILITY + WARRANTY

Built for High-Output Diesel Use — Backed for Life

Sentinel Heavy Duty Exhaust Brakes are engineered to handle:

  • High exhaust temperatures
  • Sustained braking cycles
  • Increased exhaust flow from performance upgrades
  • Heavy towing and commercial use

Every Sentinel Heavy Duty Exhaust Brake is backed by a lifetime warranty.

FITMENT

1989–1998 Dodge 5.9L Cummins (12-Valve)

Fitment depends on:

  • Exhaust pipe diameter at the installation location
  • Available clearance for inline mounting
  • Existing exhaust routing or modifications

Bundy Motors can assist with fitment confirmation before or after purchase.

FAQ — 12-Valve Cummins (Heavy Duty)

When should I choose Heavy Duty over Standard?
Choose Heavy Duty if your truck has a performance turbocharger, upgraded injection system, or is used for frequent towing, heavy hauling, or commercial applications.

Does this work on mechanical 12-valve engines?
Yes. Sentinel is designed specifically to work with mechanical diesel platforms.

Is the exhaust brake automatic?
The exhaust brake can be operated manually or automated using an optional micro switch connected to the throttle.

Do I need an air system or engine programming?
No. Sentinel is fully electric and requires no air systems or programming.

Upgrade Your 12-Valve Cummins for Maximum Braking Control

Add maximum-capacity exhaust braking to your Dodge Cummins and protect your service brakes on every downhill grade.

🟩 Buy Heavy Duty

Questions before ordering?
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