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2003 Chevrolet Impala: metric or American bolts?

I want to change my rotors and brake pads. I am curious to know what bolts and nuts are used Metric or American ?

Carl , have you ever done anything like this ? Also you should have both sizes in your tool box already. You could even have both and you will find out when you start.

All metric although you will find that a few of those metric sizes are very close to English.

Don’t do this unless you have both a jack AND jack stands. Safety first! Assume the car will be down for a day or 2. Make sure you have alternate transportation so you can shag parts or tools from the parts store you didn’t anticipate needing. Also assume rust has made the rotor difficult to remove and made the bleed screws difficult to open. While you are there, use fresh brake fluid and bleed it until the fluid no longer looks dark. If this hasn’t been done before, it will easily take a full quart of fresh brake fluid.

Watch a YouTube video of someone else doing this on your car model so you know what to look for.

If you have rear disk brakes, assume you will need a tool to screw the rear pistons back into the calipers to allow fitment of the new rear pads.

If you have any doubts, don’t do the job yourself. Going is optional, stopping is not!

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