Brake system, power, front and rear disc, antilock, front and rear wheel, heavy duty

Years 1963–79, 2006–09, 2014–19, 2023–27 Models 9 Factory citations 22

Also described as HD front disc / rear metallic drum brakesSpecial Sintered Metallic (heavy-duty) Brake PackageSpecial Heavy-Duty Brakes (competition caliper package)Special Heavy-Duty Brakes (competition metallic caliper package)Special Heavy Duty BrakesHeavy duty brakesBrakes, 4-wheel antilock, 4-wheel discBrakes, 4-wheel antilock disc (Grand Sport and Z06)Brakes, 4-wheel antilock, 4-wheel disc, performance 6-piston front and 4-piston rear

Also documented for Cadillac

Documented applications

Camaro

1967 Factory-verified

Z28; requires J50

GM Heritage factory kit — 1967 Chevrolet Camaro, p.75.

Corvette (C1 / C2)

1964 Factory-verified

$629.50; 29 built; race-oriented brake package

GM Heritage factory kit — 1964 Chevrolet Corvette, p.17.
1966 Factory-verified

$342.30; 382 built

GM Heritage factory kit — 1966 Chevrolet Corvette, p.14.
1967 Confirmed

$342.30; 267 built

Corvette (C3)

1968 Factory-verified

$384.45; 81 built

GM Heritage factory kit — 1968 Chevrolet Corvette, p.7.
1969 Factory-verified

$384.45; 115 built (price and count: Corvette Black Book)

GM Heritage factory kit — 1969 Chevrolet Corvette, p.105.

Impala / Full-Size

1963–70s (varies) Confirmed

Camaro — Gen 5 Zeta (2010–2015)

2014 Confirmed

the list gives J57 and JL9 the same wording; GM Authority 2014 RPO list

Corvette — C6 (2005–2013)

2006–2009 Factory-verified

GM factory document — 2006 chevrolet corvette rpo code list, p.1.
GM factory document — 2007 chevrolet corvette rpo code list, p.1.
GM factory document — 2008 chevrolet corvette rpo code list, p.1.
GM factory document — 2009 chevrolet corvette rpo code list, p.1.
GM Heritage factory kit — 2006 Chevrolet Corvette, p.25.

Corvette — C7 (2014–2019)

2015–2019 Factory-verified

only in: Grand Sport, Z06; all trims: S; 2016, 2019: from GM order-guide copies (Corvette Action Center; 2019 also GM Authority)

GM factory document — 2015 chevrolet corvette fleet order guide wayback, p.4.
GM factory document — 2017 chevrolet corvette fleet order guide wayback, p.1.
GM factory document — 2018 chevrolet corvette fleet order guide wayback, p.5.

Corvette — C8 (2020–2027)

2023–2027 Factory-verified

only in: Grand Sport, Z06

GM factory document — 2023 chevrolet corvette stingray z06 order guide copy corvetteblogger, p.94.
GM factory document — 2024 chevrolet corvette stingray z06 e ray order guide copy corvetteblogger, p.151.
GM factory document — 2025 chevrolet corvette fleet order guide rpo codes, p.3.
GM factory document — 2025 chevrolet corvette fleet order guide, p.8.
GM factory document — 2026 chevrolet corvette fleet order guide rpo codes, p.3.
GM factory document — 2026 chevrolet corvette fleet order guide, p.8.
GM factory document — 2027 chevrolet corvette fleet order guide rpo codes, p.1.
GM factory document — 2027 chevrolet corvette fleet order guide, p.18.

HHR (2006–2011)

2009 Factory-verified

GM factory document — 2009 chevrolet hhr rpo code list, p.1.

This page aggregates every documented appearance of J56 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.