Anti-lock brakes became standard equipment in all Cadillacs in 1991.
The 4.5-liter V-8 formerly used to power most Cadillacs was replaced by a more powerful 4.9-liter V-8 with port fuel injection. This new engine saw service in DeVille/Fleetwood, Eldorado, and Seville models.
Also new, and coupled to the 4.9-liter V-8, was the 4T60-E electronically controlled four-speed automatic transmission with overdrive.
The rear-wheel drive Brougham sedan’s standard 5.0-liter V-8 received fuel injection and delivered 21 percent more horsepower (up to 170) over the previous year’s carbureted unit.
Computer Command Ride was new to Fleetwood, Seville, and Eldorado. It had automatically adjusted struts to provide increased damping and road control as those vehicles’ speed increased.