Mack Trucks Inc. has introduced the PowerLeash engine brake, which is now available on Mack’s Application Specific Engine Technology (ASET) engines, providing drivers with improved vehicle ...

And that’s where Mack’s new PowerLeash engine brake shone. Despite the relatively small 10.8 L displacement, PowerLeash still manages 400 retarding hp at 2,100 rpm. The fan was programmed to cut in as ...