The Jensen FF became the first production car with four-wheel anti-lock brakes when it was introduced in 1966.
The British Jensen FF combined all-wheel drive with a Dunlop Maxaret anti-lock braking system adapted from aircraft technology. The system helped prevent wheel lock during hard braking, allowing drivers to retain steering control on slippery surfaces.
The FF name referred to Ferguson Formula, the all-wheel-drive system supplied by Ferguson Research. It also used a Chrysler V8 engine and an unusual long-wheelbase body derived from the Jensen Interceptor.
The Jensen FF was expensive and produced in small numbers, so it did not make anti-lock braking common immediately. Modern ABS systems became widespread decades later as electronics made them more compact, reliable, and affordable.