What size bolt is on the caliper of a 2001 Chevy blazer?

There's no single answer to what size bolt is on the caliper of a 2001 Chevy Blazer. The size depends on whether it's a front or rear caliper, and even then, it can vary slightly depending on the specific Blazer model (e.g., 2-wheel drive, 4-wheel drive, engine size).

To know for sure, you need to:

1. Consult a repair manual: A Haynes or Chilton repair manual specific to your 2001 Chevy Blazer will list the correct bolt sizes.

2. Check a parts store website: Websites like AutoZone, Advance Auto Parts, or Napa Auto Parts allow you to look up parts by your vehicle's year, make, and model. Searching for "brake caliper bolts" should give you the correct size.

3. Measure the bolts yourself: If you can safely access the caliper bolts, you can measure them with a caliper or ruler. Note that the size is usually expressed in metric (e.g., 14mm, 15mm) for most vehicles of this era.

Do not attempt to remove or work on your brake calipers unless you are experienced and have the proper tools. Improper brake maintenance can be extremely dangerous.