1. Consult a repair manual: A Haynes or Chilton manual specific to your vehicle year and model will give you precise bolt sizes and torque specifications. This is the most reliable method.
2. Check a parts catalog: Online parts stores (like AutoZone, Advance Auto Parts, or RockAuto) allow you to select your vehicle and view diagrams of the brake system. These diagrams often show the bolt sizes.
3. Remove the caliper (carefully!): Once you've removed the caliper (after properly disconnecting the brake line and ensuring the piston is retracted), you can directly measure the bolts. However, this is the least recommended approach unless you have already planned on replacing the calipers and have the necessary tools and knowledge.
Important Note: Always use the correct size and type of bolt when reassembling your brakes. Using the wrong bolts can lead to brake failure, which is extremely dangerous.
