Year and make of car might help.
3/8" Allen wrench
I think that is a 14 mm open wrench, not Allen.
I believe that will be a 7mm Allen key.
If your asking about what size wrench is needed to remove the bolt that holds the front brake calipers on a 93 Chevy pick up, it would be a 3/8" allen wrench.
Changing your own front brake pads can save hundreds of dollars. Tools needed for the job are a jack, the brake pads, lug wrench, socket wrench, and brake fluid.
You will need aÊ7mm Allen wrench key to remove the front brake pads on a 2001 Clio. The Allen wrench can be purchased at any auto parts store.
7mm
with a 14mm wrench
Metric Allen wrench.
Allen wrenches come in various sizes. There is no definitive information as to what size is needed to remove a brake caliber so you will need to match the wrench size to the best of your ability.
You need 15 and 18 mm wrench.
I believe that would be a 1/2 inch wrench, but would it be too difficult to take 2-3 wrenches and try them fr size.