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PacBrake C40113 PRXB Exhaust Brake for Caterpillar 3126B & C7 – 4" Inline Mount

PacBrake C40113 PRXB Exhaust Brake for Caterpillar 3126B & C7 – 4" Inline Mount
PacBrake C40113 PRXB Exhaust Brake for Caterpillar 3126B & C7 – 4" Inline Mount
PacBrake C40113 PRXB Exhaust Brake for Caterpillar 3126B & C7 – 4" Inline Mount
PacBrake C40113 PRXB Exhaust Brake for Caterpillar 3126B & C7 – 4" Inline Mount
PacBrake C40113 PRXB Exhaust Brake for Caterpillar 3126B & C7 – 4" Inline Mount
PacBrake C40113 PRXB Exhaust Brake for Caterpillar 3126B & C7 – 4" Inline Mount
PacBrake C40113 PRXB Exhaust Brake for Caterpillar 3126B & C7 – 4" Inline Mount
PacBrake C40113 PRXB Exhaust Brake for Caterpillar 3126B & C7 – 4" Inline Mount
PacBrake C40113 PRXB Exhaust Brake for Caterpillar 3126B & C7 – 4" Inline Mount
: C40113
In Stock(10)
$995.00
$1,297.27

PacBrake Special


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Sale ends 03/31/2026 at 11:59:59
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PacBrake C40113 PRXB Pressure Regulated Exhaust Brake for CAT 3126B and C7 Inline Exhaust Applications


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:

  • Sterling 8000 with Cat 3126B / 3126E with S-Pipe Exhaust
  • Sterling Actera (MX) with Cat C7
  • Sterling HX Series with Cat C7 and Horizontal Exhaust
  • Ford F650 / F750 with Cat 3126B / 3126E / C7 with Late 90° Exhaust Pipe

Special Notes:

  • Inline exhaust installation - Does not mount to back of turbo.

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 pacbrake on my motor home, want to replace but not sure of the part number. I did find a tag that said made for freightliner with a serial number of E031350 but no part number, also looking for proper clamps that I would need. Unit is 21 years old and I think it hangs up and didn’t release when it should. Thank you ( Bill Brainard, 02/25/2025 )

Hello Bill, that calls for : 

C40106B - Pacbrake PRXB Exhaust Brake Caterpillar 3126B / 3126E / C7 4" Full Marmon

 

C10310 - Exhaust Brake Clamp

and  :  

C11350 - Exhaust Brake Clamp (4" Exhaust Side Clamp)


Would this brake work well on my Pete 335 with C7 Cat and Allison auto trans? ( Josh Vogt, 01/09/2025 )
A PacBrake exhaust brake would be very effective on your truck. You would actually need the direct turbo mount brake part # C40106B, as well as the mounting group C11558, control group C10319 and Allison lockup harness C13060E.
Can this be made to work on a truck with hydraulic brakes?
I see that it is air activated.
The truck is a 2004 F650 with a Cat C-7 and an Allison transmission
( Jesse Calvert, 07/10/2024 )
Yes but you would need to add an a compressor and controls to activate it: C11775 - Control Group w/ Air Compressor
I am doing a custom install and was curious if this is air or electric operated?
( John Ware, 03/19/2023 )
All PacBrake Exhaust Brakes are air controlled.
Do you offer a pacbrake kit for this, 1994 GMC topkick, 3126 cat, allision automatic trans, looks like a 545 trans, truck has air brakes ( Rick Rogers, 09/16/2022 )
We don't believe the AT545 has a locking torque converter which would make the brake very ineffective and would not recommend.

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