PRXB problem...
My 1997 CC Allure has a PRXB Pacbrake, exhaust brake which replace the original sometime around 2005. The coach now has 67000 miles on it of which I have put about the last 36,000 on it. The engine ...
Forum Discussion
Does the transmission downshift toward the pre-select gear?
Have you checked for exhaust leaks-- if a leak before the exhaust brake, it will NOT build back pressure? Look CAREFULLY for black exhaust trails: between head and exhaust manifold, exhaust manifold itself, exhaust manifold to turbo, turbo to exhaust brake.
If all the above is OK, there is a test port on the PacBrake where you can connect a pressure gauge to see what back pressure it is providing.
Have you checked for exhaust leaks-- if a leak before the exhaust brake, it will NOT build back pressure? Look CAREFULLY for black exhaust trails: between head and exhaust manifold, exhaust manifold itself, exhaust manifold to turbo, turbo to exhaust brake.
If all the above is OK, there is a test port on the PacBrake where you can connect a pressure gauge to see what back pressure it is providing.
