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USD 1561.79
Part #: PBC40008

Pacbrake C40008 InLine Mount PRXB Exhaust Brake

1995-1997 Ford 7.3L Powerstroke
Part #: PBC40008
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Pacbrakes 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, Pacbrakes 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.

In order to have consistent and effective braking over the entire RPM range, it is important (and necessary) to maintain constant backpressure. To achieve this, Pacbrakes patented design has incorporated an additional waste gate on the butterfly valve to regulate the amount of exhaust flow that is being passed through. The flow is controlled by a spring-loaded arm, whose pressure rating and location are key factors in the functionality of the PRXB. Located outside of the housing and away from the heat, the spring is able to maintain its strength and durability for years of proper and precise braking performance.

Backpressure is created by exhaust flow entering the housing, hitting the closed butterfly valve and being forced back out in the direction it came. It is maintained by the pressure-controlled spring that is located on the outside of the exhaust brake housing.

As the engines RPM increase, the spring compresses and the arm moves away from the butterfly valve, therefore releasing more exhaust flow through the orifice. As the RPMs decrease, the spring releases and the arm applies pressure back onto the plate, covering the hole, and ultimately releasing a smaller amount of exhaust flow.
There is less than a 10% change in backpressure over the entire RPM range on the PRXB

  • PRXB Delivers Strongest Braking Horsepower
  • Less Wear & Tear On Service Brakes
  • Ideal For In-City Driving Or Steep, Downhill Grades
  • For Use On Stock Exhaust, Adapters Needed For 4" (See Below)
Shipping Restrictions Apply shipping restriction icon This product can not be shipped to these states: CA

Transmission Controller Required For Automatic (Not Included)
Vehicles with aftermarket 4" O.D. exhaust systems will require C11400 adapter. (see below)

Vehicle Applications

1995 Ford 7.3L Powerstroke
1996 Ford 7.3L Powerstroke
1997 Ford 7.3L Powerstroke


  • MFG. Number C40008
  • Manufacturer Name Pacbrake
  • Shipping Weight 35.00 lb.
  • Shipping Length 18 in.
  • Shipping Width 17 in.
  • Shipping Height 10 in.
  • Fuel Type Diesel
  • UPC 628480000848
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
  • Internal L0R0


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Questions and Answers

Will this product work if I install Banks TransCommand?
View Staff Answer 

The Pacbrake C40008 InLine Mount PRXB Exhaust Brake requires the use of an aftermarket transmission torque converter lock-up controller on all 1995 – 1998 Ford F250 / F350 7.3 L Powerstroke Diesel with automatic transmissions. (The Banks Trans is not the proper transmission controller for this exhaust brake.)

Click Here for Install Instructions
I already have a Banks TransCommand installed. Can the one for the PRXB work in conjunction with it? I read the other question regarding the Banks TransCommand but it didn't answer what I would like to know. I hope I don't have to remove the Banks product just to install the PacBrake because IT needs a special transmission regulator.
View Staff Answer 

The trans commend is actually different from a lock up controller required for this exhaust brake. – Take a look over the instructions to better familiarize yourself with this item vs what you may currently have.

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