Sounds like you have original 67 GTO disk brakes. The 67-68 calipers came with springs behind each puck which would apply continuous pad pressure to the rotor. In 1969 and later manufacturers decided that the pressure did nothing but increase wear on the pads and rotors and caused some rolling resistance. I started leaving the springs out 40 years ago after being advised the assemblies were better off without them. Haven't seen a set of commercial rebuilt calipers with springs in them either.
If you want to retain the springs it's a bit of a juggling act spreading the pistons and inserting a temp spacer to keep them spread until they are slid over the rotor.
I believe that this was possibly the only caliper design where the O-ring was on the piston instead of the caliper. Later designs allowed replacing the pistons when pitting occurred for a new surface for the seal to ride on. Our seals move on the caliper itself and pitting requires either a new caliper or a sleeve installed in each of the bores.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
Last edited by lust4speed; 11-01-2021 at 02:40 AM.
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