Review on 🔧 Dorman Brake Master Cylinder M73323: Compatible with Ford / Mercury Models by David Dugas

and other Ford models. The single-bowl master cylinder lets you lose your brakes if one wheel loses brakes. The line or wheel cylinder fails and you lose brakes on all four wheels. Introduced in 1967, the dual key gives you at least front or rear braking, whichever system does not fail, as it has its own master cylinder section, "its own key".