TORONTO, Ont. – The Maintenance Council of the Ontario Trucking Association has sounded the alarm over a potentially deadly flaw in the Canadian Motor Vehicle Standard governing the operation of ...

We’ve shown how you can get your hydraulic trailer brakes up to stratch, but if you want ultimate stopping power you should consider updrading to air. Why air? Installation: part 1 Installation: part ...

As much as I enjoy driving tractor-trailers, one thing that has irked me for many years is the parking brake valves on the dashboard. The two push-pull valves -- the yellow one for tractor brakes and ...

Hydraulic-over-air relay valves are designed to convert hydraulic-modulated input pressure to a proportional output air pressure. The valves are suited for on and off-highway applications ...