front axle, brakes, bearings, wheel hub,...and rear brakes too

Discussion in 'E9 Projects and Restorations' started by deQuincey, Jun 10, 2018.

  1. deQuincey

    deQuincey Well-Known Member Site Donor

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    so after this happened

    6949D3D3-8521-48B4-BB18-20FC1407F9DF.jpeg
    i have decided to take a deeper look on the front axle system,...
     
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  2. deQuincey

    deQuincey Well-Known Member Site Donor

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    i was considering the noise of the RH wheel, that was not sure if it was a bearing or the ball joint at wishbone,
    so i plan to remove all those bits and make an intensive maintenance...will see

    look at the symthoms,

    left side wheel, is Ok, no noise



    front side wheel is not

     
    Last edited: Jun 10, 2018
  3. deQuincey

    deQuincey Well-Known Member Site Donor

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    37C8FBE1-6ECF-4B7C-9C78-C49D0A7115E9.jpeg this is a wishbone, a most complex thing to remove as serious torque is involved at least at the big bolt and nut
    usually the ball joint castellated nut is corroded and difficult to remove, so penetrant oil is needed and we will see how bad or well i can remove the ball joint itself,

    tip, a 50-50 mixture of acetone and ATF oil acts as a good and cheap penetrant fluid for this purposes, bear in mind
     
    Last edited: Jun 10, 2018
  4. deQuincey

    deQuincey Well-Known Member Site Donor

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    3FE1D0C7-F8BB-435D-B22E-E6E5232FADCA.jpeg after some fiddling with the different elements i discover that to remove the wheel hub is not that difficult, so all the area is ready now to play,...

    most scary thing is to remove the brake lines from caliper, the nuts are so delicate ...

    tip, while being in this i applied the lanoline based hodt product fluid film, it is a marvel against rust and can be applied directly on body and mechanical elements as is not harmful to rubbers, it gives that shiny wet aspect to the underbody
     
    Last edited: Jun 10, 2018
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  5. deQuincey

    deQuincey Well-Known Member Site Donor

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    814B1A98-4F74-4097-A4F4-A223AEE26E80.jpeg but now calipers are ready for a complete overhaul,...
     
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  6. deQuincey

    deQuincey Well-Known Member Site Donor

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    calipers, easier than what i thought

    clean them in a big tank with dishwasher soap and a karcher water jet
    use a lot of compressed air to dry them, and clean two times with clean brake fluid

    422A2652-1C1E-46A6-ADF0-4A0D69D3F899.jpeg 59B85489-ECB0-47B9-8CBA-EA033187FB35.jpeg

    remove dirt in pistons and cylinders with a scotchbrite

    C83E5ED2-CA80-4D2C-8D73-0CB62034BFDE.jpeg C4E2F2F7-2441-4CB6-A375-9E1AF916774D.jpeg 4E6F5E4A-67F4-4B44-99C8-2B4BB4700DDA.jpeg C8AD74F9-4C7A-4B81-88A7-F6F35A8FD4E5.jpeg DEE8F541-273A-438F-ACD3-64090789F0E2.jpeg 42AAB5B0-C278-4FD4-8E74-35F434DCD462.jpeg DFA10B6E-949C-40F9-ACC9-E0698B2CBCDA.jpeg 6C5CA7C9-F107-4326-954E-92095AC38B39.jpeg
     
  7. Markos

    Markos Parts Liquidator Staff Member Site Donor $$

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    Is it critical to march the pistons to their original cyliner?
     
  8. m_thompson

    m_thompson Active Member

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    I had the same part break in the same way. W&N airmailed a replacement.

    I bought new pistons from W&N.

    The most difficult part of the caliper rebuild is getting the clips on the dust boots.

    I packed the area behind the dust boot with synthetic brake grease.

    I painted the calipers gold so they look nice and similar to the original zinc-chromate.

    There are lots of companies that offer rebuilt calipers. All of the ones that I have found have pictures of the right calipers, but the ones that they deliver are missing the spacer between the caliper halves, so they won't fit over the thicker vented rotors.
     
  9. Rek

    Rek Active Member Site Donor

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    Perhaps it was that leaf? It did make quite a noise.
     
  10. Bmachine

    Bmachine Well-Known Member Site Donor $$

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    Leave it to DQ to notice a $5 broken brake pad spring and to end up not only replacing the control arms but also to completely rebuild the calipers.
     
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  11. deQuincey

    deQuincey Well-Known Member Site Donor

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    oke, i have a question about brake disk thickness,

    according to the manuals i can see that theoretical thickness should be 22mm, and minimum acceptable thickness is 21mm


    84DFB7E8-28D7-411B-98B9-19F414C00774.jpeg
     
  12. deQuincey

    deQuincey Well-Known Member Site Donor

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    so i checked it following the method that the manual explains

    7557F909-DDB9-4273-A635-A7E656F18249.jpeg

    and i found that LH disk is only 17,5mm

    9B11F779-B386-4666-A98E-F58370E4E68D.jpeg

    and the RH is 17,05

    765110FA-4162-4C0D-84CB-CF01F59C3CE1.jpeg
     

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    Last edited: Jun 13, 2018
  13. deQuincey

    deQuincey Well-Known Member Site Donor

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    am i right ?
    should i change the disks, right ?
     
  14. Bmachine

    Bmachine Well-Known Member Site Donor $$

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    When I got my car the fronts were at 20 and rears at 18. So I put new ones in the front and left the rears alone.

    If you're at 17, I would definitely change them. They are not that expensive and since you have it all apart it is really easy to do at this point.
     
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  15. deQuincey

    deQuincey Well-Known Member Site Donor

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    yes for sure, what i can’ t believe is how is it possible to have them at 17mm, that is a lot less than 21 , four mm is a lot of metal !
     
  16. Bmachine

    Bmachine Well-Known Member Site Donor $$

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    I was also surprised by that. I am wondering if maybe the 21 mm spec is for a different year than yours…
     
  17. deQuincey

    deQuincey Well-Known Member Site Donor

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    yeah, that was my first thought, hence the question here, but as far as i can tell there is no warning about different years in the manuals when referring to disk thickness
    ...
     
  18. Bmachine

    Bmachine Well-Known Member Site Donor $$

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    One other option I was thinking about is that may be a previous owner installed the wrong discs.
     
  19. Cornishman

    Cornishman Member Site Donor

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    De Q, I find it hard to believe that you have lost 4mm, that is a 2mm grove in both sides. You would notice that as the pads do not go to the very edge of the disk. Or someone has machined them back on a lathe.

    Then, why is there a minimum thickness! I imagine it is to stop the pistons travelling out too far when the pads are worn.

    In my view, if there is no deep grove then they are fine. You could do a mock up to see how far the pistons travels before popping out.

    I checked my reprint blue books, they give the same information as yours.

    If you are worried I will measure mine at the weekend.

    CB
     
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  20. Markos

    Markos Parts Liquidator Staff Member Site Donor $$

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    Just measured my spare CSI rotors (used). They are both about 22.1mm

    The specs are stamped on the rotor...

    7762FD07-643B-4115-9DC5-E3D2E25DB96A.jpeg D29348E6-3C30-4705-BA72-FD380083A265.jpeg
     

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