Morning and Happy New Year, I agree with Lynn, they must slide along the pins or you'll get uneven wear on the pads and rotors from just the action of the piston side rather than an equal wear pattern from both sides. As to diameter of the caliper bolts, that's more critical than their overall length IMHO (if they're a tad too long that's fine as long as they don't interfere with the rim) which is doubtful as they'd need to be quite long for that. Too short is more of an issue obviously. Original GM bolts / pins are typically stamped "S" and sometimes I've seen "L" - I would think they are reusable if they show no damage and still have good threads; they're not really a stress item.
The caliper should slide freely, but not necessarily by hand, just with the braking action of the car. Lube the rubber o-rings and then periodically check for even wear once you're driving - often the piston side pad wears more quickly due to an uneven pressure from the whole caliper not sliding.
I likely have some original pins if you decide to go that way - may even have a single if you PM me with what you want to match up too. Check for the vendor stamp "S" and take a measurement of overall length you want to match; I'm sure there was variance between vendors. The "S" stamp is often in the hex head on the "outside" of the bolt when installed, but they can be on the inboard side too.
Cheers and good luck with the project!
Anthony
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01-01-2023, 03:30 PM
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