What size Allen wrench do you need for changing brakes 1994 camaro?

You won't need an Allen wrench to change the brake pads on a 1994 Camaro. Brake calipers on that year typically use a 1/2-inch or 9/16-inch wrench to remove the caliper mounting bolts. You might also need a 13mm wrench or socket for the caliper guide pin bolts depending on the exact configuration. Always check your specific vehicle's repair manual for confirmation. An Allen wrench is much less common for this job, usually only used for certain caliper designs (rare on that vehicle).