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The 2015 Jeep Grand Cherokee was offered with two brake options: standard duty and heavy duty brakes. An easy way to determine which brakes your Grand Cherokee has is to check the rear rotors. If the rotors have holes or slots for ventilation, then you have the heavy duty brakes. Conversely, if the rotors are solid, you have the standard duty brakes. The heavy duty brakes were commonly found on Grand Cherokee models with a V8 engine, as the increased power required larger brakes for effective stopping. It is possible to upgrade from standard duty brakes to heavy duty brakes using a kit.
No, that's not the case – it doesn't apply to Fiats or Jeeps. This pertains to General Motors vehicles.
In the 2015 Jeep Grand Cherokee, you can find the brake code location on a sticker inside the glove box.