Reduced Speen
Asked by iceman501960 Dec 28, 2018 at 11:30 AM about the 2016 Ford F-150 XLT SuperCab 4WD
Question type: General
When driving down the highway I can hear a roaring sound and when coasting
down a steep hill if I take my foot off the gas the vehicle will slow down as if
something is holding it back.
2 Answers
Jack up each wheel and spin it, to check if you have a brake hanging up. Hopefully that's all it is, and not something related to the transmission/OD. A tranny shop can put it on their diagnostics and test each shift solenoid, OD, torque converter, things like TPS, speed sensors, etc.
Hornet_2497 answered 5 years ago
Some of these newer trucks designed to pull heavy loads come with an "engine brake" feature that use the engine's compression to help slow the vehicle. I think Dodge has it on their Cummings Diesel powered trucks. I'm sure Ford has it too on their Power Stroke trucks. When I drove truck, they had a Jacob's Braking system (Jake Brake) that would roar when you let off the throttle coming down a hill, thus prevented overheated/failed brakes. You could switch it on/off and high/med/low. A real life saver in hilly country.