I noticed in last couple trips i made mine stage 2 engine brake is weak, almost don't feel any diference from stage one, no fauls in engine, any ideas?
You may want to look into having the overhead ran if you have not had it done recently. It should make a difference. Here is a link to the owners manual of a VN and VHD with a D12D : http://www.dmbruss.com/images/Schematics/OM_PV776_20707967_lores.pdf REQUIRED:
Once a year,
every 130,000 miles,
(209,000 km) or
every 2,500 hours,
(whichever comes
first)