Semi-Trailing Arm rear suspension unit
Front disk brake
"The Zephyr Mark IV has an advanced and extremely efficient 4-wheel independent suspension system with semi-trailing arms and shackles, coil springs and telescopic dampers.

The individually sprung rear wheels, being free from the twisting forces imposed by a normal rear axle, maintain close contact on wet and slippery roads and permit the full power of the car to be used with safety.
"
Ford advertising brochure
Mk IV Pages
A detachable cross-member supports the engine and carries the inner pivots for the rear suspension links. Final drive and rear suspension assemblies are also carried on detachable cross-members, which are rubber insulated at their four anchorages to the main hull. Extensions behind the gearbox and forward from the final drive housing have kept propeller shaft length to the minimum, eliminating a possible source of noise and vibration. Mounting the spare wheel in the nose has made room for a huge boot capacity without much tail overhang
Autocar 22 April 1966