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Thread: 1984 R65 Brembo Brake Identification (36mm bore?)

  1. #1
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    1984 R65 Brembo Brake Identification (36mm bore?)

    So on my '84 R65 - I would like to rebuild my front brake caliper & master cylinder, as the front brake has always felt weak to me. Right now, I'm trying to identify my front calipers.

    I have a single Brembo caliper on my bike, mounted on the left as shown in the picture. Looking at the back of the caliper, it's stamped 7A-36. I'm assuming that means the bore is 36mm? From what I can gather, the Brembo calipers for this model should be 38mm.

    I would appreciate any help with identifying what brakes I have - I've come to find that my bike is a bit of a Frankenstein, so I wouldn't be surprised if the calipers are not original.
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  2. #2
    Registered User STEVENRANKIN's Avatar
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    While you are at it

    Sorry, I can't help you with your question but I will stick my nose in and give a bit of advice while you have things apart. Replace the brake lines. Over time the original lines break down and get soft leading to a mushy feel when braking.

    Best improvement is to change to a stainless brake line of some sort. There are many different brands on the market but buying from EME, Boxer Two Valve or some well known supplier of BMW performance parts will get you a good deal.

    Good luck on the rest of the rebuild and again sorry I can't help.

    If you give the folks at Max BMW or EME a call, they will be very happy to get you the parts you need for a rebuild. St.

  3. #3
    And I'll add to the non-answers by recommending red rubber grease when you reinstall the pistons. It makes a very difficult job easy.
    '13 690 Duke, '13 Daytona 675R, 2020 R1250R, '19 Ninja 400 (track bike), '21 Duke 890R, '22 Street Triple RS (gone but not forgotten: '61 Clubman's Gold Star, '76 R75/6, '84 R100, '76 R90S)

  4. #4
    Registered User PAS's Avatar
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    Max BMW shows an ATE caliper on the 84 models. Make sure you do some more research.

  5. #5
    Registered User STEVENRANKIN's Avatar
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    Microfiche

    Max BMW's microfiche shows ATE and Brembo brakes for the 78 to 85 bikes.

    This is for left and right calipers O69 and 070. St.

  6. #6
    You could pull the caliper and measure the piston, preferably with vernier calipers.
    '13 690 Duke, '13 Daytona 675R, 2020 R1250R, '19 Ninja 400 (track bike), '21 Duke 890R, '22 Street Triple RS (gone but not forgotten: '61 Clubman's Gold Star, '76 R75/6, '84 R100, '76 R90S)

  7. #7
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    I don't claim to know the specs for your set up, but that sure looks like a F05 Brembo body, right side would be a # 20.2676.40 RH Standard, which are only 2 X 32 MM. Rebuild parts are available. As others have stated, be sure to check what you really have as far as piston size is concerned.
    Dave Hutton '78 R100S (mfg 7/77)

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