What size Allen wrench is required to remove the brake caliper on front of a 90 model Chevy silverado k1500?

The size of the Allen wrench (hex key) needed to remove the brake caliper bolts on a 1990 Chevy Silverado K1500 varies depending on the specific caliper and even the manufacturing variations within that year. There's no single definitive answer.

While it's *commonly* a 7/16" or 11mm, you should:

1. Check your owner's manual: If you still have it, this is the best resource.

2. Visually inspect the bolts: Before you start working, look closely at the caliper bolts themselves. The size should be stamped on the bolt head (though it might be worn or difficult to read).

3. Use a set of metric and SAE Allen wrenches: Having a complete set of both metric and SAE hex keys will ensure you have the right size. Start by trying the common sizes (7/16" and 11mm) and work your way through the set if necessary.

Important Safety Note: Always use the correct size wrench to avoid stripping the bolt head. If a wrench doesn't fit snugly, don't force it. A slightly oversized wrench can easily round off the bolt head, making removal very difficult.