In my honest opinion, the BD Brake and Jacobs E-Brake are the best. Everything else flat out sucks.
Avoid the Pacbrake... I have seen many of them go bad due to por craftsmanship, and the pressure regulation on them is garbage... You have to drill a hole in the butterfly valve to regulate the pressure. This is fine when the pressure is high, but at lower RPM, it renders the brake virtually useless.
The US Gear D-celerator is garbage as well. It is still the old electric-solenoid style, and those are prone to becoming a victim to corrosion because of the location they are in. Also, you had better have a tight exhaust system for using on eof these, as it is a remote-mount (under truck) style. Also, the wiring system they use is too complicated for the application.
The BD Brake is by far the best. All componets on it are replaceable, making service easy. The vacuum chambe and piston are finely machined parts, and their regulation system is the best. Rather than use a pressure switch like they used to, they now have a 60 lb spring inside the vacuum chamber. When pressure gets to 60 lbs, it will actually push the butterfly valve open, regulating exhaust pressure.
The Jacobs E-Brake is designed well, and I like their control system the best... On the 24-Valve trucks it interfaces with the ECM, so no accelerator microswitch is needed. Installation is easy.
I will be installing a BD turbo mount brake on my truck soon, and will be wiring it into the ECM so I don't have to put in an acclerator pedal microswitch. This is going to be a real trick setup--best brake, with the best control system. Gotta love that!
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One last thing, when it comes to exhaust brakes, you get what you pay for, with the exception of the D-celerator--which is expensivec crap!
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