PORTLAND, Ore. — If you live near a downhill section of freeway, you've no doubt heard that staccato-like rumbling of big semis trying to slow down. It reverberates through nearby neighborhoods like ...

Among the reasons someone might want to avoid passing a semi-truck is to steer clear of that harsh piercing screech it makes when slowing down. That sound is referred to as brake squeal, and although ...

Fleet managers should have a good understanding of engine brakes and how they are properly used. How often do you hear drivers complaining about weak engine brakes? Some drivers will say the engine ...

Modern diesel engines perform exceptionally well at 1,100 to 1,200 rpm. They deliver peak torque just a few hundred rpm above idle, and peak horsepower somewhere around 1,500 or 1,600 rpm. But what ...