Brakes, vacuum power, 4-wheel disc, 7,200 lb

Years 2003–07 Models 2 Factory citations 5

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Also described as Brake, 4 wheel antilock, 4 wheel disc

Also documented for GMC

Documented applications

Silverado — GMT800 (1999–2007)

2003–2007 Factory-verified

GM factory document — 2003 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2007 chevrolet silverado classic 2wd rpo code list, p.1.
GM Heritage factory kit — 2003 Chevrolet Silverado 1500, p.46.
GM Heritage factory kit — 2007 Chevrolet Silverado, p.55.

Tahoe — GMT800 (2000–2006)

2003 Factory-verified

The 2003 order guide prints it as "Brakes, 4-wheel antilock, 4-wheel disc"; the 2005 and 2006 order guides print no brake code

GM Heritage factory kit — 2003 Chevrolet Tahoe, p.114, p.148.

This page aggregates every documented appearance of JC4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.