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PacBrake C40105 PRXB Exhaust Brake for Caterpillar 3116, 3116E & 3126 – 4" Full Marmon

PacBrake C40105 PRXB Exhaust Brake for Caterpillar 3116, 3116E & 3126 – 4" Full Marmon
PacBrake C40105 PRXB Exhaust Brake for Caterpillar 3116, 3116E & 3126 – 4" Full Marmon
PacBrake C40105 PRXB Exhaust Brake for Caterpillar 3116, 3116E & 3126 – 4" Full Marmon
PacBrake C40105 PRXB Exhaust Brake for Caterpillar 3116, 3116E & 3126 – 4" Full Marmon
PacBrake C40105 PRXB Exhaust Brake for Caterpillar 3116, 3116E & 3126 – 4" Full Marmon
PacBrake C40105 PRXB Exhaust Brake for Caterpillar 3116, 3116E & 3126 – 4" Full Marmon
PacBrake C40105 PRXB Exhaust Brake for Caterpillar 3116, 3116E & 3126 – 4" Full Marmon
PacBrake C40105 PRXB Exhaust Brake for Caterpillar 3116, 3116E & 3126 – 4" Full Marmon
PacBrake C40105 PRXB Exhaust Brake for Caterpillar 3116, 3116E & 3126 – 4" Full Marmon
PacBrake C40105 PRXB Exhaust Brake for Caterpillar 3116, 3116E & 3126 – 4" Full Marmon
PacBrake C40105 PRXB Exhaust Brake for Caterpillar 3116, 3116E & 3126 – 4" Full Marmon
: C40105
In Stock(10)
$995.00
$1,168.84

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Sale ends 03/31/2026 at 11:59:59
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PacBrake C40105 PRXB Pressure Regulated Exhaust Brake for Caterpillar 3116 / 3116E / 3126 Medium-Duty Trucks and Motorhomes


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 hold-back in the 1400-1800 RPM range (where you typically drive).
  • The spring controlled pressure regulated mechanism on the exhaust brakes protects against engine over-pressure.
  • 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 maximize back-pressure 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:

  • Freightliner FL50 / FL60 / FL70 / FL80 with Cat 3116
  • Freightliner FL50 / FL60 / FL70 / FL80 with Cat 3116E / 3126
  • Chevrolet/GMC C6500 / C7500 / C8500 with Cat 3116
  • Chevrolet/GMC C6500 / C7500 / C8500 with Cat 3116E / 3126
  • Chevrolet/GMC T6500 / T7500 / T8500 with Cat 3116E / 3126
  • Kenworth T300 with Cat 3116E / 3126
  • Peterbilt 330 / 335 with Cat 3116E / 3126
  • Motorhomes with Cat 3116 / 3116E / 3126 with 4" Full Marmon Turbo Flange

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

I have a 95 GMC topkick with a 3116 cat and and 8LL transmission. I didn't see a description for the product saying what comes in the kit and or what else is needed to make this exhaust brake fully functional. Looking for some more information on what this control group is that I saw mentioned in another customers question. Do you happen to have installation instructions you could send me so that I can compare it to my application to verify installation before purchasing?Thanks. ( Cyrus , 07/27/2024 )
There is a special note regarding this engine "If Engine SN is below 2BK25000 will not work" so you'll need to verify you don't fall under that first. The C40105 is the brake cylinder only, you will need the mounting group (clamp) and control group (wiring and solenoid) to complete the installation. We do not have an installation guide for this but if you contact PacBrake directly they might be able to assist with that: 800-663-0096.
Is there an advantage to full Marmon over half Marmon or is it a variation in fitment? ( Liam O'Neill, 11/17/2021 )

It is just a difference in the bevel of the turbo mounting face.


Does this fit 1994 GMC topkick mechanical 3116.
Also does this come with everything need to install. Thanks
( Ryan Butler, 04/07/2020 )
Our application lists show that this would be the correct brake. You would also need a mounting clamp part # C10310 and control group C10318.

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