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Prices may varyThis product ranks #15 of 15 in Brake Rotors.Three above it ↓
Last reviewed July 12, 2026
TL;DR Power Stop's AR8658 is a vented, non-coated OE-stock-replacement rear rotor for full-size GM trucks. It discloses no iron grade, and though precision mill-balanced, publishes no runout tolerance, so it is scored on its specs.
This single rear rotor is Power Stop's Autospecialty line, the budget OE-stock-replacement tier below the coated Z-series kits. Power Stop is an aftermarket maker, not the OE casting supplier here, and discloses no iron grade, so metallurgy sits at the neutral anchor. The bare casting is honestly labeled non-coated and surface-rusts on the hat if left undriven; the vented design matches the OE rear brake.
Buy it as an inexpensive stock replacement rear rotor for a daily-driven full-size GM truck or SUV. Skip if you park outdoors in a salt-belt climate, where a coated rotor stays rust-free, or if you tow heavy and want a documented iron grade.
No chemical exposure pathway: an inert cast-iron part with no SDS. Brake service stirs up brake dust, so wear a dust mask and never blow it out with compressed air, a hazard belonging to the service procedure, not the rotor. The cast iron recycles as ferrous scrap; a Proposition 65 warning applies to the cast metal.
It is a non-coated (bare) cast-iron rotor. Power Stop's Autospecialty line is precision mill-balanced but ships without a zinc or geomet anti-corrosion coating, so the hat and outer edge can surface-rust if the vehicle sits undriven. The friction faces clean up on the first few stops.
AR8658 is a single rear rotor (left or right). A full rear brake job uses two, so order two if you are replacing both sides. It is a vented design matching the OE rear brake on these full-size GM platforms.
No. Power Stop is an aftermarket brake company. AR8658 is an OE-stock replacement designed to meet original-equipment dimensions, but Power Stop is not the factory casting supplier, and no iron grade is disclosed for this part.
No. The listing states the rotor is precision mill-balanced but publishes no numeric runout or thickness-variation figure, so that dimension is scored conservatively rather than assumed.
Confirm the year, model, and brake package against the applications verified on this page before buying. Full-size GM platforms can carry more than one brake package across trims, so a rotor that fits one may not fit a heavy-duty or upgraded package.
The Amazon listing for Power Stop AR8658 Autospecialty Rear Brake Rotor carries a California Prop 65 warning. California requires this warning on a very wide range of manufactured goods — including rubber, vinyl, plastic, and metal automotive parts — whenever trace exposure to any of roughly 900 listed substances (commonly phthalates or heavy metals) is possible, regardless of whether the specific product poses a meaningful health risk. As a passive accessory, Power Stop AR8658 Autospecialty Rear Brake Rotor has no Safety Data Sheet, so there's no chemistry breakdown to translate beyond that.
Marketing copy from Power Stop, via Amazon. Not editorial.
Per manufacturer cross-reference. Verify on Amazon before purchase.
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