The 2015 GMC Sierra HD Exhaust Brake: Feature Spotlight - GM Authority (blog)
The refreshed 2016 GMC Sierra 1500 and 2016 Chevrolet Silverado 1500 gobbled up the lion’s share of the headlines this week. The exhaust brake , standard on 2015 Sierra HD models with Duramax diesel engines, is one of those crucial features that operates seamlessly in the background when applied. The exhaust ‘brake’ itself is a valve that closes off the exhaust path from the engine, which creates backpressure that retards engine speed and forces the built-up exhaust pressure ‘backwards’ into the engine, slowing the pistons down. This helps slow the truck on steep downhill grades, reducing brake distance and brake wear. Hop in a 2015 Sierra HD and you’ll find the button for the exhaust brake in the switchbank below the climate controls in the center stack. Press it, and the driver information centre immediately flashes up a message informing drivers the system is activate. It’s a simple yet ingenious solution and one we fully expect to see when GMC pulls the curtains off the 2016 Sierra HD in the coming. Source: gmauthority.com
