What is the size of the front brake caliper bolts on the 2012 flhx

Allen wrenches usually come in a set, try 3/8.

1. Torque Specs For F250 Caliper Bolts - Diesel Forum - TheDieselStop.com

   www.thedieselstop.com > ... > 1999-2007 General Questions Jan 13, 2009 - 3 posts - ‎1 author
   Does any one know what the caliper bolts torque specs are? ... Disc brake caliper pin bolts - Excursion, F-250/F-350 with Ford and Dana axle ... Torque specs for front brakes
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I haven't done a brake job on a bike this new but it shouldn't be any different than any other bike. Simply take the two bolts that hold the caliper on out. Remove the old shoes. Use either a large C-clamp or a large pair of slip joint pliers and squeeze the piston back into the caliper all the way. Install the new pads and put the caliper back in place. Replace the two bolts and torque them to 25 Foot pounds. Squeeze the brake lever until you have a good firm brake.

Good Luck
Steve

not bolts but pins! i would get a manual even then there not fool proof,,,like the "haynes" book of lies???

Please try a TRX --E10 socket

Below is a picture of the front caliper assembly for your truck. The caliper pin bolts are 13mm I believe.
Good luck.

2 CALIPER BOLTS EITHER A REGULAR WRENCH OR 3/8 ALLEN WRENCH. MEDIUM SIZE C-CLAMP TO PUSH IN THE CYLINDER ON THE CALIPER , AND HIGH TEMP BRAKE GREASE TO PUT ON CALIPER BOLTS WHEN RETIGHTENING. HOPE THIS HELPS CRAIG.
HERES A LINK TO LOOK AT I FOUND TOO!!

http://www.2carpros.com/how_to/how_to_replace_brakes.htm

It's either 8mm Allen OR 8mm 12 point

Sometimes they use a T-50 torx bit, and sometimes they use either a 15mm or 18mm bolt, however the caliper bracket is a 21mm bolt