JL4 ◑ Single-source

Chevrolet · Regular Production Option

Dual brake system (gas models)

Years 1967 Models 1

Documented applications

C/K Trucks →

• 1967 ◑ Single-source

  Dual master cylinder, std later

This page aggregates every documented appearance of JL4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.