Brakes, 4-wheel antilock, 4-wheel disc, 12.6 inch front and 11.3 inch rear rotors

Years 2019–20 Models 1 Factory citations 1

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Also described as Brakes, 4-wheel antilock, 4-wheel disc

Also documented for Buick Chevrolet

Documented applications

Terrain — Second generation (D2XX) (2018–2024)

2019 Factory-verified

SLE, SLT: O; Denali: S; only with the LTG engine; GM Authority's 2021 changes page reads it as 17 inch front and 16 inch rear brakes

GM factory document — 2019 gmc terrain order guide copy gm authority, p.9, p.43.
2020 Single-source

with the LTG engine; GM Authority reads it as 17 inch front and 16 inch rear brakes; 2020 from GM Authority's 2021 changes page, which lists it as deleted for 2021 with the LTG

This page aggregates every documented appearance of J17 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.