On August 1, 2011 a new air brake standard for three-axle tractors with Gross Vehicle Weight Ratings (GVWRs) up to 59,600 lbs. took effect. This rule applies to tractors invoiced after August 1, 2011.

Mitchell 1 has added color air brake diagrams to Tractor-Trailer.net, its comprehensive Web-based truck repair manual system. The pneumatic diagrams will include the same widely-used features as the ...