308 front brake caliper and brake line question? | FerrariChat
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308 front brake caliper and brake line question?

Discussion in 'Technical Q&A' started by jwise, Dec 9, 2005.

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  1. jwise

    jwise Formula Junior

    Apr 2, 2003
    781
    Portland Maine
    #1 jwise, Dec 9, 2005
    Last edited by a moderator: Sep 7, 2017
    I'm in the middle of a suspension rebuild- and have a couple of questions on the Euro 308 ATE calipers and stainless brake lines:

    The face of the caliper piston that contacts the brake pad is stepped down a few mm for about a third of the contact area. I see something on the ATE instructions that came with the seal kit (from Pelican Parts) about using a special guage to adjust the angle of the notch to 20 degrees or something. How do I do this without that special tool? Just eyeball it? I guess I could just make a quick template? See photo.

    Why is there a notch in the top of the piston?

    Also- the dust boot on the top edge of the piston is nothing like the one that came in the kit. The original is white and has no ring holding it in. The parts manual shows a ring- am I missing something? I just popped the old ones off wiith a pick.

    I cleaned everything and re-asssembled one of the calipers. The pistons went in fine, but are difficult to turn now if I need to realign the notches in the top of the piston. Will it hurt the new seals to put some compressed air to it again to pop out the pistons again to re-align? I used brake fuid to lubricate the piston during assembly.



    Brake line question:
    I have new Goodridge stainless wrapped lines to replace the old rubber ones. The original connection from rubber line to hard lines were held to the body of the car with a bracket and a spring clip. The new ones look to be fed through the original bracket, and then held to the body with threaded ring fit snug to the bracket. The original spring clip is not used. Does this sound correct?

    I assume that the connections between the hard lines and flexible lines should be made with a little brake fluid as lubrication? Or, is something else recommended?

    Sorry for all the questions- but being that these are the brakes, I want to make sure everything is correct.



    Thanks
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  2. FasterIsBetter

    FasterIsBetter F1 Veteran

    Jul 22, 2004
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    #2 FasterIsBetter, Dec 9, 2005
    Can't answer your question regarding the notch, but when I replaced the rubber brake lines on my Mondial with Goodridge stainless lines, the setup was the same for both -- both held with the spring clip. The fitting went through the bracket and the spring clip pushed in behind to hold it in place. Using the threaded lock fitting would probably work, but a little awkward I assume getting the lock nut on before lining up the threads from the hard line on the car.
     
  3. tomberlin

    tomberlin Formula Junior
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    Apr 9, 2005
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    Bethesda
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    tom berlin
    #3 tomberlin, Dec 9, 2005
    Noise abatement. The notch makes the piston press on the pad unevenly, I believe the rotor hits the recess first: weaker pressure at first contact, increasing as the rotor rotates along the diameter of the piston. You can spin the piston with effort.
    Cheers,
    Tom
     
  4. CliffBeer

    CliffBeer Formula 3

    Apr 3, 2005
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    #4 CliffBeer, Dec 10, 2005
    jwise, tom is exactly correct. The notch is to avoid front loading of the pad (and the consequential excessive wear) at the front edge of the pad. The notch allows for more even pressure on the pad when the brake line pressure has the pad pressing against the rotor. I would definitely make sure you have the alignment at least reasonably eye balled correctly (doesn't have to be exactly 20 degrees but it should be close).
     
  5. jwise

    jwise Formula Junior

    Apr 2, 2003
    781
    Portland Maine
    #5 jwise, Dec 10, 2005
    Last edited by a moderator: Sep 7, 2017
    Thanks folks. I've finished the caliper rebuilds, and I just made a quick template from cardboard and marked the 20 degrees on the calipers. Then, I just aligned the pistons with the marks as I pushed the pistons in with my fingers. Seems like it will be fine.

    Attached are photos of the old seals (white) and the new that came with the kit. The new dust seals attached fine with the supplied snap rings.

    Any ideas on the brake line mounting?

    Thanks again.
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  6. Martin308GTB

    Martin308GTB F1 Rookie

    Jan 22, 2003
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    Black Forest Germany
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    #6 Martin308GTB, Dec 10, 2005
    no, you didn't miss anything. The kit without the separate ring and the white dust boot is the old version ATE no. 13.0441-4827.2, which is no more available.
    It was replaced by the ATE kit no. 13.0441-4819.2 (Porsche part no. 911 351 946 00 ).

    Best Regards from Germany

    Martin
     
  7. Artvonne

    Artvonne F1 Veteran

    Oct 29, 2004
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    #7 Artvonne, Dec 10, 2005
    Not to hijack this thread, but I was wondering something. If its true that the front calipers are the same as a Porsche 914, then is it also possible to upgrade to the 320i BMW caliper? Or is there another caliper that fits these cars? I thought I heard that a Mazda caliper off a rx7 would fit. Anyone?
     
  8. Verell

    Verell F1 Veteran
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    May 5, 2001
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    #8 Verell, Dec 12, 2005
    I took a quick look at using the 4-piston caliper from a 2nd Gen Rx7 TurboII or GSL. Actually doing the conversion is still on my round2it list.

    The rotor thicknesses & diameters are close enough so I'm pretty sure they won't cause problems. It should just take making an adapter plate similar to the plate in the BREMBO calilper kit to reconcile the differences in the bolt holes.

    The Rx7 caliper is quite a bit larger than the OEM one, but not as big as the BREMBO upgrade one. I'd expect it to perform in between the two.

    Don't know about the BMW caliper.
     
  9. Owens84QV

    Owens84QV F1 Rookie

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    #9 Owens84QV, Dec 27, 2005
    I've been doing some searches for the Goodridge brake lines and cannot find the "49001" part number I've seen referenced before. Where did you buy yours?

    Pretty easy installation process?
     
  10. FasterIsBetter

    FasterIsBetter F1 Veteran

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    #10 FasterIsBetter, Dec 27, 2005
    I got mine from Demon Tweaks in the UK. From their website, you can get the complete chart of applications. If in doubt, you can measure the existing ones, take some digital pics and email them to DT and they will make them up to spec.

    The job was not difficult. Hardest part is removing the old spring clip, and lining up the male threads on the hard line on the car with the new female on the new lines without cross-threading them. Be very, very careful about that -- be sure that they are threaded right and turn them in as far as possible by hand to avoid cross-thread. You'll need to move the new line around a bit to line up the threads, so don't install the spring clip until you've got them fully threaded and relatively tight.
     
  11. jwise

    jwise Formula Junior

    Apr 2, 2003
    781
    Portland Maine
    #11 jwise, Dec 27, 2005
    I bought mine from Stevson Motors in the UK.

    http://www.stevsonmotors.co.uk/home.htm

    I just emailed them first and in the end called with purchase info. No problems, and the date printed on the lines is after I ordered them. It took about a 10 days for delivery. Item # TFE0200-4 for a Euro 308 QV.
    Cost- about $75 delivered. My old lines mounted to the car via a clip- the new ones will mount via a threaded fitting.

    Demon Tweeks would not sell me a set without a sample in hand of my old ones. Measurements and photos would not do it for them, so I looked around and found Stevson. They were cheaper than Demon Tweeks to boot.

    I have not installed them yet, but test fit one and it seemed fine. I don't see any real trouble when the time comes.
     
  12. Owens84QV

    Owens84QV F1 Rookie

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    #12 Owens84QV, Dec 27, 2005
    Thank you Steve and Jwise! Mine is a Euro 308 QV so that part number will be perfect!

    - Greg
     
  13. Artvonne

    Artvonne F1 Veteran

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    #13 Artvonne, Dec 27, 2005
    I seen the BMW caliper upgrade on a 914 site. As many have said the 308 uses the same caliper on the front as a 914, I would assume the BMW would bolt up as well. But we can never assume anything.

    Can you tell me more about the RX7 caliper. This adapter bracket, do you have a pic of it? Would we need a master cylinder upgrade?
     

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