Kbt mud carter

Low power in all the gears. Until 7th.

Rr gearbox. Egr motor, BMD turbo

turbo is not to old. Boost leaks checked. Good

fuel pressure check. Good.

Compression checked. Good

There’s a big 100amp or 150 amp fuse in the battery box in a plastic cover. Check that first

Has any one had problems were the stage one and two on the engine brake button makes not difference. It just feels like only the exhaust brake works. I change switch, still the same.

mack 2016 trident mp8 mdrive.

I had a problem we’re I was lossing boost intermittent. There was no fault codes. The problem was the wiring in the front of the motor had rubbed through and was grounding on the block

What normally happens valve. 

Mack trident 2008 with a mp8 engine. 

The engine brake works on stage 1 but on stage 2, it dose nothing.  

Has anyone had this problem