Some of the involved vehicles do not comply with federal motor vehicle safety standard no. 121, "air brake systems". The air reservoir capacity IS below that allowed by the standard.
Risk and remedy
Remedy
Dealer will either replace the existing tank with a larger tank or add a second tank, without charge to owner.
Technical service bulletins and other communications the manufacturer sent dealers about this vehicle. Ask a dealer for the full document by its number.
10040181Paccar: engineering standards have changed and there are now engines with heat treated bolts.
10040180Paccar: a software update IS causing the check engine light to come on.
Every Kenworth W900 model year
Bars are owner complaints, dots mark years with recalls. Select a year to open its report.