Stuck allen screws for rear calipers!!! | FerrariChat
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Stuck allen screws for rear calipers!!!

Discussion in 'Technical Q&A' started by barcheta, Aug 22, 2006.

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  1. barcheta

    barcheta F1 Rookie

    Nov 15, 2003
    3,738
    Maryland
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    Jim
    #1 barcheta, Aug 22, 2006
    The outboard ones are no problem... but the inboard ones are a PITA... I don't want to strip the 4mm opening so what else can I use to turn these to compress the piston? Thoughts?! TIA
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Jan 11, 2001
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    30°30'40" N 97°35'41" W (Texas)
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    #2 Steve Magnusson, Aug 22, 2006
    Last edited by a moderator: Sep 7, 2017
    Stripping the female hex drive on those rear inboard caliper plugs is a common problem. If completely stripped, you'll need to either file/grind a groove into the head of the plug to use as a drive feature or whack the edge of the plug with a punch/chisel to try to rotate it CCW.

    Once you get them out, replace them with the Porsche 914 part PEL-BRC-02 from www.pelicanparts.com (which has an external hex drive head):
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  3. FasterIsBetter

    FasterIsBetter F1 Veteran

    Jul 22, 2004
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    #3 FasterIsBetter, Aug 22, 2006
    I have one word for you -- Kroil. It's amazing stuff. Much better than PB Blaster, Liquid Wrench or any of those things. Shoot some Kroil on the bolts and let them sit for a few hours. Do it a couple of times and the stuck will come unstuck. Trust me, it works.
     
  4. BabyFerrari

    BabyFerrari Rookie

    Aug 22, 2006
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    anonymous
    #4 BabyFerrari, Aug 23, 2006
    sears sells a set of "sockets" for stripped bolts. buy them, they are like 20bucks and work great
     
  5. thecarreaper

    thecarreaper F1 World Champ
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    Sep 30, 2003
    18,071
    Savannah
    #5 thecarreaper, Aug 23, 2006

    we use "Aerokroil" on really corroded aircraft parts during heavy service work. it is the best stuff i have ever seen in action period. even dissimilar metal and galvanic corrosion are no match for the stuff.
     
  6. walawdog

    walawdog Formula Junior

    Nov 9, 2004
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    Anthony
    #6 walawdog, Aug 23, 2006
    I don't want to hijack the thread, but I was having some problems with my 308's rear calipers. It seemed that the e-brake was sticking on. The inner pad on the driver's side was worn to the metal. The guy at the shop said it was a common problem and my caliper needed to be rebuilt. Well, after about 1k of work performed, as soon as I used the e-brake, you guessed it, it stuck on. Obviously not a caliper problem. Do you think it's just a cable problem? I know that to retract the pads you need to undo the cap (on the outside of the caliper) and then the retaining nut and back the screw off, but, is there the same adjustment for the inside portion of the caliper?
     
  7. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    BANNED Lifetime Rossa

    Jan 11, 2001
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    30°30'40" N 97°35'41" W (Texas)
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    #7 Steve Magnusson, Aug 24, 2006
    Last edited by a moderator: Sep 7, 2017
    Yes -- after removing the inner threaded plug shown in the figure, there is a free-floating pinion gear piece with a female hex drive (3~4~5mm?), that when turned, moves the inner piston in-and-out (but not sure how, or why, this adjustment would affect "sticking" if present):
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