I've fought with these before and was able to get mine off once I stepped up to a 1/2" drive ratchet, however I have one that now refuses to budge even with the 1/2" ratchet.

I think an air impact would be a quick solution but I don't have easy access to one so I'm going to let some PB Blaster soak before I try it again, however what I don't understand is why they're so difficult to get off? Are you guys using a breaker bar on it?

Isn't the torque spec on the caliper guide pin bolt only 23 ft/lbs?

I could understand if it was the caliper mouting bracket bolt (torqued to 74 ft/lb).

 

All you need is a good mallet to whack the wrench a couple times or a breaker bar works, but I would advise using the fewer number of sides socket so you grip the bolt exactly.

 

Any chance you recall what size socket it is? I'm away from my car and it would probably just make sense to pick up a good socket while I'm out.

 

^ No, but you need one of these: http://toolmonger.com/2009/12/08/cos...scent-toolkit/

 

couple rear assemblies in garage have 15mm hex. I 'impact' them loose with a good fitting long box wrench struck by a heavy hammer/mallet.

 

I noticed they like to get stuck. But better that than loosening themselves instead.

I have a breaker bar or a long-handled ratchet I use for stubborn stuff like that.