What size Allen key do you need remove the brakes of a 1994 grand am?

There's no single Allen key size that applies to all brake components on a 1994 Pontiac Grand Am. Different bolts and components will likely require different sizes. You'll need a set of Allen wrenches (hex keys) ranging from small (like a 5mm) to possibly larger (maybe up to 10mm or even larger depending on the specific caliper design).

To determine the correct sizes, you'll need to:

1. Visually inspect the brake calipers and components: Look at the bolts holding the caliper to the bracket and the caliper mounting bracket to the knuckle. The size will be stamped on the head of the bolt in most cases.

2. Consult a repair manual: A repair manual specific to your 1994 Pontiac Grand Am will show diagrams and specifications, including the size of the Allen wrenches needed for brake work.

Important Safety Note: Working on brakes is critical for safety. If you're not comfortable working on brakes, it's best to take your car to a qualified mechanic. Improper brake work can lead to serious injury or death.