18mm. Turns out bottom slide pin was siezed. I wish I had time to orderthe guzzle pin slide kit, but I need the truck today.
had to pick up a new caliper bracket and pins.
Not a bad job, but getting the caliper off the rotor without opening the bleeder screw took a lot of time and manuveriing.
Eventually I tried to open the bleeder screw, but it was on so tight I was afraid it would snap off. So I just muscled the caliper off.
2001 F-350, 7.3L, Crew Cab, 4x4, Dually.
150,000 miles, and going strong.
It likes to pull a 28' 2005 KZ Frontier Travel Trailer (8,000#).
ISSPRO 3 gauge (pyro, boost, trans) pillar install.
Located on Long Island, NY