Re: Ford 2021 exhaust brake.

Diesel engine exhaust brakes (valve in exhaust stream or variable geometry turbos) and compression release brakes (“jake brakes”) offer more braking hp as rpm increases.

Gearing down out of overdrive gears and lower rear ratios increase the effectiveness of engine braking.

Hydraulic and electro magnetic retarder do not rely on engine rpm but lower rear axle ratios make them more effective as well.

I’m going to grab some popcorn.