My '74 2.0's PO put in 320i front calipers. I went to replace the pads and found that one of the calipers was frozen with the piston out (pic 1 below) and I cannot get it to move. Good news, he also gave me another caliper (pic 2). Bad news, the caliper has a spacer (for vented rotor?) and the flanges are not machined down. Good news, I can take the spacer out, bad news, don't I need an o-ring where the two halves meet? If so, where can I get them? I'm hoping with those that I can then put the halves together, get the flanges machined, and I'm back in business?
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You probably want to contact our brake guru Eric Shea at PMB Performance.
The piston can be pumped out using a grease ,thread a flexible (rubber)hose on to the grease gun for this procedure ,use a small G clamp to hold the opposite one from popping out.
Take care doing this as I once cracked a caliper half when the piston didn't come out straight .
Yes you do need small 'o'rings between the caliper halves,a brake repair shop should have the rebuild kits or BMW should stock them.
Why not put the -4 calipers back on? You have a set up that was an urban legend. Go to the classic section and read up on brake systems.
Check your local O'Reilly's or similar.....something like $35 for reman'd 320i calipers....
Yes, it was not really an upgrade. Those crazy engineers usually went for the best option when braking.
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