Commercial Sentinel™ Exhaust Brake for Cummins 8.9L ISL, ISL9 & L9

Powerful Electric Exhaust Braking for Your Working Cummins.

Heavy loads. Long grades. More control.

Give your Cummins-powered truck powerful aftermarket exhaust braking with the Commercial Sentinel. Built for demanding commercial use, it combines a heavy stainless-steel valve assembly with a powerful engineered electric worm-drive actuator.

Braking power up to 80% of engine horsepower. Actuation in less than one second. Backed by a lifetime warranty.

For Cummins 8.9L ISL, ISL9, and L9 applications. Use our Exhaust Brake Selector to confirm your vehicle configuration and order online or by phone.

FIND YOUR BRAKE, ORDER ONLINE OR BY PHONE

BUNDY MOTORS 435-704-2272

Put Your Cummins to Work—Holding You Back.

Your engine works hard pulling the load uphill. The Commercial Sentinel puts it to work helping control your descent.

By creating controlled exhaust backpressure, Sentinel uses the engine’s retarding power to help manage downhill speed and reduce reliance on your service brakes.

• Greater control on long, steep grades

• Less service-brake heat and wear

• Reduced risk of brake fade from overheating

• Powerful braking while towing or hauling

• More confidence behind the wheel

Maximum braking output varies with engine speed, engine configuration, gearing, and operating conditions. Exhaust braking supplements your service brakes.

The Strength Is in the Actuator.

An exhaust brake for a working Cummins needs the strength to move—and hold—its valve against substantial exhaust pressure.

The Commercial Sentinel delivers that strength through a powerful electric motor and worm-drive gear reduction. It actuates in less than one second, then mechanically holds the valve in position under load.

The heavy stainless-steel valve assembly is built to withstand high exhaust temperatures and repeated commercial use.

Fast actuation. Powerful hold. Built like a tank.

All Electric. Automatically Controlled.

No air compressor. No vacuum pump. No pneumatic hoses or vacuum lines.

Sentinel’s electric actuator operates the valve directly, simplifying installation and eliminating the supporting air or vacuum equipment required by other designs.

With throttle-automated control enabled:

• Release the throttle: the valve closes to provide exhaust braking.

• Apply the throttle: the valve opens so you can accelerate.

• Dash switch turns the system on or off.

No ECM or TCM programming required.

Installation is simple and requires no specialty tools. Use the Exhaust Brake Selector to find the appropriate setup for your application. We’re always happy to help by phone if you need assistance.

An Aftermarket Braking Option for Your Cummins.

Whether your truck lacks an exhaust brake, needs additional retarding power, or is getting an aftermarket turbo, the Commercial Sentinel gives you another option.

On compatible applications, it can:

• Provide independent exhaust braking

• Work alongside an existing OEM VGT exhaust brake

• Supplement an existing compression-release engine brake (Jakes)

• Retain exhaust-braking capability when changing to an aftermarket turbo

Keep your braking. Choose your turbo.

Use our Exhaust Brake Selector to confirm your vehicle configuration and find the correct brake.

FIND YOUR BRAKE, ORDER ONLINE OR BY PHONE

Tested Under Serious Load.

During our Commercial Sentinel field tests, we used a tanker truck pulling a pup trailer at a total loaded weight of 138,000 pounds, descending an 8% grade for more than 7 miles.

The Commercial Sentinel performs exceptionally throughout the descent.

Built for demanding work—and tested doing it.

Heavy-Duty Construction. Straightforward Installation.

• Heavy stainless-steel valve assembly

• Powerful electric worm-drive actuator

• Mechanical worm-drive lock

• True 5-inch valve

• Options for 4-inch and 5-inch exhaust pipe (selected at checkout)

• Throttle-automated operation

• No air or vacuum system required

• No ECM or TCM programming required

• Lifetime warranty

• Simple installation

Installation includes fitting the brake inline in the exhaust, routing the wiring, and connecting the controller. Requirements vary by vehicle and engine configuration.

Frequently Asked Questions

Will this work with my 8.9L ISL, ISL9, or L9?
The Commercial Sentinel is offered for these engine applications. Use our Exhaust Brake Selector to confirm your vehicle configuration and select the correct setup.

Can I use it with an existing Jake brake?
It can supplement an existing engine brake on most applications. Use the Exhaust Brake Selector to confirm your configuration. If you need assistance, we’re happy to help by phone.

Does it require an air system?
No. Sentinel is fully electric, with no air compressor, vacuum pump, or pneumatic control lines required.

Will it work with an aftermarket turbo?
Sentinel operates independently of the turbo, providing an exhaust-braking option when changing to an aftermarket turbo.

What warranty comes with it?
Every Sentinel Exhaust Brake is backed by a lifetime warranty.

Give Your Cummins the Braking Power It Deserves.

Whether you operate one truck or manage an entire fleet, put powerful electric exhaust braking to work.

FIND YOUR BRAKE, ORDER ONLINE OR BY PHONE

Need help choosing? We’re always happy to assist by phone at 435-704-2272.

Commercial Sentinel™ by Bundy Motors

Trust your descent!