 Brake Conundrum, Advice on 320i calipers |
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| Shredhead |
 Aug 15 2016, 08:39 AM
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#1
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Member  Group: Members Posts: 110 Joined: 10-August 15 From: CT Member No.: 19,047 Region Association: North East States  |
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?
https://1drv.ms/f/s!AuJyTaQROWZRg8R810bU27sxlPvkSg |
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Replies(1 - 7)
| Montreal914 |
Aug 15 2016, 08:49 AM
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#2
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Senior Member Group: Members Posts: 1,591 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California 
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You probably want to contact our brake guru Eric Shea at PMB Performance.
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| porschetub |
Aug 15 2016, 01:34 PM
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#3
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Advanced Member Group: Members Posts: 4,706 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
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 (IMG:style_emoticons/default/sad.gif) . 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. |
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| 914Sixer |
Aug 15 2016, 06:22 PM
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#4
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914 Guru Group: Members Posts: 8,906 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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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.
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| wndsrfr |
Aug 15 2016, 07:10 PM
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#5
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Senior Member Group: Members Posts: 1,430 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region
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Check your local O'Reilly's or similar.....something like $35 for reman'd 320i calipers....
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| Krieger |
Aug 15 2016, 11:32 PM
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#6
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Advanced Member Group: Members Posts: 4,728 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None
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QUOTE(wndsrfr @ Aug 15 2016, 06:10 PM)  Check your local O'Reilly's or similar.....something like $35 for reman'd 320i calipers.... If you do this you will need to machine the mounting face. I can't remember but it is something like 1/8 inch to center caliper over the rotor. |
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| porschetub |
Aug 16 2016, 12:24 AM
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#7
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Advanced Member Group: Members Posts: 4,706 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(914Sixer @ Aug 16 2016, 12:22 PM) 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. Interesting ,read that on here in the past is it because larger pad area or bigger pistons? or is that not correct and it isn't an upgrade in reality???? |
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| 914Sixer |
Aug 16 2016, 03:32 PM
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#8
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914 Guru Group: Members Posts: 8,906 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Yes, it was not really an upgrade. Those crazy engineers usually went for the best option when braking.
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