I drive a 2003 Ford Ranger with front disc brakes. About two years ago I replaced the rotors and pads and am sure I used a thread lock during assembly (and torqued to spec).
The other day when I was applied the brakes on a freeway offramp I the truck behaved almost like it had a flat. When I inspected everything one caliper had a slight bit of play. So I disassembled, cleaned, and reassembled everything and the issue seems to be resolved.
During reassembly I used blue thread lock, but am second guessing if that's the right option. I've always used blue for anything I'll disassemble and red for anything permanent--but given brakes generate quite a bit of heat I'm wondering if those aren't the right option.
What variety of thread lock is best for ensuring the caliper mounting bolts stay put and correctly torqued? I'm looking at the bolts that mount the bracket to the knuckle, as well as the caliper to the bracket.