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Heh - too many replies to respond to each...

Vehicle = 2008 Ford Explorer. Front brakes need new pads.

Are the caliper pins threaded only near the hex head? Then I “may have a chance.” But if they are only threaded near the hex head, I am amazed they’ve not freed up: I’ve been hitting these things with PB Blaster every few hours for 3 days (started Fri. afternoon), hammering them each time I went back to the vehicle, and I’m using a breaker bar...

I also tried hammering the end of the breaker bar, but it proves impossible to keep the socket on the pin’s shallow hex head: If I keep trying I’ll “round” the head and not be able to get anything on it. :-(

The hex heads are to the inside of the wheel well: There is some clearance, but I don’t think I can get my impact wrench into position, especially for the top pin. I just bought a longer swivel head breaker bar and will try that, but again there is the problem of keeping the socket on the head, if I’m “out at the end” of the breaker bar. (This also obviously applies if using a pipe to increase leverage.) Maybe I can somehow clamp down the bar & socket to the hex head of the pin? Hmmm...

Drilling out the pins would take a right angle drill, it appears, and lots of time, as there’s no way I can see to get good pressure on the drill bit to the hex head, using a right angle drill.

I assume the neoprene boots are easily available — need to check — as heat may be the only answer... One flexible (rubber-ish) brake line is close to the top pin head.

It occurs to me that my pin heads being shallow makes them “pinheads”.