Brake system, power, front disc, rear drum, cast iron, antilock, front and rear wheel

Years 1998–04 Models 5 Factory citations 22

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Also described as Brake system, front disc, rear drum, antilockBrakes, antilock

Also documented for Buick Chevrolet GMC Pontiac Saturn

Documented applications

Achieva — N-body (1992–1998)

1998 Factory-verified

other lists word JM4 as a power brake system with cast iron rotors and four-wheel antilock; this list's wording is the short form.

GM factory document — 1998 oldsmobile achieva rpo code list, p.1.

Alero — N-body (1999–2004)

1999–2004 Factory-verified

shared N-body code; Chevrolet Malibu kit

GM factory document — 1999 oldsmobile alero rpo code list, p.1.
GM factory document — 2000 oldsmobile alero rpo code list, p.1.
GM factory document — 2001 oldsmobile alero rpo code list, p.1.
GM factory document — 2002 oldsmobile alero rpo code list, p.1.
GM factory document — 2003 oldsmobile alero rpo code list, p.1.
GM factory document — 2004 oldsmobile alero rpo code list, p.1.
GM Heritage factory kit — 2000 Chevrolet Malibu, p.30.
GM Heritage factory kit — 2001 Chevrolet Malibu, p.30.
GM Heritage factory kit — 2002 Chevrolet Malibu, p.18.
GM Heritage factory kit — 2003 Chevrolet Malibu, p.18.

Cutlass — N-body (1997–1999)

1998–1999 Factory-verified

the 1998 list prints JM4 twice, as "Brake System, Front Disk, Rear Drum, ABS" and "Brakes, Antilock"; the 1999 list prints the power, cast iron, front and rear wheel wording.

GM factory document — 1998 oldsmobile cutlass rpo code list, p.1.
GM factory document — 1999 oldsmobile cutlass rpo code list, p.1.

Eighty Eight (LSS) — H-body (1992–1999)

1998–1999 Factory-verified

GM factory document — 1998 oldsmobile eighty eight rpo code list, p.1.
GM factory document — 1999 oldsmobile eighty eight rpo code list, p.1.

Silhouette — U-body second generation (1997–2004)

1998–2004 Factory-verified

GM factory document — 1998 oldsmobile silhouette ext rpo code list, p.1.
GM factory document — 1999 oldsmobile silhouette ext rpo code list, p.1.
GM factory document — 2000 oldsmobile silhouette ext rpo code list, p.1.
GM factory document — 2001 oldsmobile silhouette ext rpo code list, p.1.
GM factory document — 2002 oldsmobile silhouette ext rpo code list, p.1.
GM factory document — 2003 oldsmobile silhouette ext rpo code list, p.1.
GM factory document — 2004 oldsmobile silhouette ext rpo code list, p.1.

This page aggregates every documented appearance of JM4 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.