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PacBrake C40017 PRXB Exhaust Brake for Cummins 8.3L ISC & 8.9L ISL – 3.5" Full Marmon Turbo Flange

PacBrake C40017 PRXB Exhaust Brake for Cummins 8.3L ISC & 8.9L ISL – 3.5" Full Marmon Turbo Flange
PacBrake C40017 PRXB Exhaust Brake for Cummins 8.3L ISC & 8.9L ISL – 3.5" Full Marmon Turbo Flange
PacBrake C40017 PRXB Exhaust Brake for Cummins 8.3L ISC & 8.9L ISL – 3.5" Full Marmon Turbo Flange
PacBrake C40017 PRXB Exhaust Brake for Cummins 8.3L ISC & 8.9L ISL – 3.5" Full Marmon Turbo Flange
PacBrake C40017 PRXB Exhaust Brake for Cummins 8.3L ISC & 8.9L ISL – 3.5" Full Marmon Turbo Flange
PacBrake C40017 PRXB Exhaust Brake for Cummins 8.3L ISC & 8.9L ISL – 3.5" Full Marmon Turbo Flange
PacBrake C40017 PRXB Exhaust Brake for Cummins 8.3L ISC & 8.9L ISL – 3.5" Full Marmon Turbo Flange
PacBrake C40017 PRXB Exhaust Brake for Cummins 8.3L ISC & 8.9L ISL – 3.5" Full Marmon Turbo Flange
PacBrake C40017 PRXB Exhaust Brake for Cummins 8.3L ISC & 8.9L ISL – 3.5" Full Marmon Turbo Flange
PacBrake C40017 PRXB Exhaust Brake for Cummins 8.3L ISC & 8.9L ISL – 3.5" Full Marmon Turbo Flange
PacBrake C40017 PRXB Exhaust Brake for Cummins 8.3L ISC & 8.9L ISL – 3.5" Full Marmon Turbo Flange
: C40017
In Stock(10)
$995.00
$1,287.51

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Sale ends 03/31/2026 at 11:59:59
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PacBrake C40017 PRXB Pressure Regulated Exhaust Brake for Motorhomes and Trucks with Cummins ISC & ISL Engines


PacBrake’s flagship product, the PRXB (pressure regulated exhaust brake), is the unquestioned leader in the supplemental brake industry. The patented PRXB design delivers the strongest braking horsepower, greatest speed reductions and shortest stopping distances possible without the use of service brakes. It maintains optimum retarding performance by maximizing the exhaust backpressure throughout the entire RPM range. Unlike a typical exhaust brake, which requires high RPMs to work properly, the PRXB delivers constant exhaust pressure (braking) as early as 1200 RPM through to the maximum allowable RPM. 

Controlled by a master ON/OFF switch, you can choose when to engage the exhaust brake with just the lift of your foot from the throttle pedal. PacBrake’s exhaust brakes provide whisper quiet supplemental braking that allows service brakes to be used much less, ultimately saving you money. They have the ability to be left on all the time, making it ideal for in-city driving or for steep, downhill grades. This product pays for itself as less wear on the brake pads means fewer brake jobs.

Product Benefits:

  • Provides 50 percent More Braking Power at Lower RPM's. PRXB gives you the best holdback in the 1400-1800 RPM range (where you typically drive).
  • The spring controlled pressure regulated mechanism on the exhaust brakes protects against engine overpressure.
  • When the brake is deactivated, exhaust flow is unrestricted and won't interfere with power output.
  • Patented 90 degree Non-contacting Butterfly Valve is specially engineered to maximise backpressure while preventing seizing.
  • The brakes use industry exclusive Arcor nitride coating on housing and components which increases resistance to wear and corrosion while strengthening the exhaust brake and adding lubricity.

Applications:

  • Motorhomes and trucks with Cummins ISC and ISL with 3.5" Full Marmon Turbo

Specifications:

  • This kit includes stainless steel v-clamps (C11355 and C20063)

Special Notes:

  • Cummins ISL engines with CPL 1096 Must Use C40020

Other Information:

  • Delivers the strongest braking horsepower, greatest speed reductions, and shortest stopping distances possible without the use of service brakes
  • Maintains optimum retarding performance by maximizing the exhaust backpressure throughout the entire operating RPM range
  • Delivers maximum exhaust pressure (braking) as low as 1200 RPM through to the maximum allowable engine RPM
  • Provides increased performance and peace of mind with technology that protects the engine from the potential of overpressure
  • Withstands extremely high exhaust temperatures
  • Compliant with latest emission regulations
  • Severe duty and military approved
  • No risk of engine overpressure



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WARNING: Products may contain one or more chemicals known in the State of California to cause cancer and/or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov

2014 M2106 Freightliner ISL9.0 Engjne.

Will this exhaust brake mate to the back of the stock turbo? What turns the exhaust brake on and off? Do you have any wiring schematics?
( Adam Jensen, 10/31/2022 )
Traditional exhaust brakes are not compatible with vehicles with 2008+ emissions systems. Your existing turbo should be a variable geometry turbo (VGT) that has the ability to exhaust brake on it's own by closing the internal vanes. If you don't, I would contact Cummins with your engine serial # to find out if that is a feature that can be turned on by them.
Dear Xltra Rv products, Will the exhaust brake C$0017 work on a 2002 Peterbilt 330 8.3 isc Cummins? The exhaust has a Jacobs set up, needs replacing. Thanks, Ed ( Edward Jessop, 04/24/2022 )
You will need to contact PacBrake directly at 800-603-0096 to determine the correct brake part # to replace your Jacobs.

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