After replacing front pads and rotors on my 94 SL320, I noticed some of the brake pad retaining pins are backing out after 50-200 miles. I thought they were tapped in all the way and were seated flush?.. Even replaced one with a new pin/lock collar... It backed out as well? Should I spread the lock collars out slightly? Apply Lock-Tite?

Crew

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94 W129
98 Audi A4
98 BMW R1100RT
95 Chev S-10 4x4 ZR2