allen head bolt size for brake caliper

[strunch]

I'm putting brake pads on my 99 astro awd cargo van. It looks like the bolts holding on the caliper are allen heads. Does anyone know what size these are? I have to go into town and buy the right tool. Is it a 3/8 ? Also, Do I need the C clamp or can I get by without one?

Thanks.

Eric

[strunch]

The size was indeed 3/8 hex wrench. They were really on tight and couldn't budge them so I used a hydraulic jack to apply force to the hex wrench and it worked like a charm.

[old_master]

A dab of anti-seize on the threads will prevent that in the future.

[QDH Dale]

I did my front brake pads on my 1997 Astro yesterday, and I too can confirm a 3/8" allen wrench works for the caliper removal. I would have thought it would be metric since everything else is metric, but whatever. Love disc brakes; it takes longer to remove the wheel than it does to replace the pads. Today we tackle the rear brake shoes...they're never as easy as disc brakes.