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Thread: master cylinders

  1. #1

    master cylinders

    Here is the FAQ on BAC for this subject. Just do a BAC search on 'master cylinder' if you need it again in future. Another example of the scope of valuable information at your fingertips on the BAC website, available to members for their modest annual dues payment. If you call around for the parts, you can ask by both the Beech number and the CLB number.

    **********************
    One of our brake master cylinders is leaking again. It's had the o-rings replaced three or four times, but always leaks again after a year or so. I saw posts recently that the Gerdes master cylinders (which we have) are no longer available. Is there any replacement for them? Any source for used ones? Beech part number is 169-380100-1 and Gerdes part number is A-110 43.
    Thanks

    Editor:

    Assuming that the cylinder shaft is not corroded or pitted, there are four main reasons why a new shaft o-ring does not hold up:

    1. A cheap o-ring was used, rather than a proper Mil-spec o-ring that is oil-resistant.

    2. The shaft is corroded, pitted, or has flaking chrome. This is not a rebuildable part (at least, not at a reasonable cost).

    3. The gland bushing that contains the shaft o-ring, and through which the shaft passes, has been worn to a slightly oval shape due to many years of slight shaft contact. The o-ring will no longer seal, once it has hardened slightly in service (especially in cold weather).

    4. Maybe 80 times out of 100, the cylinder was rebuilt with a serviceable shaft, but the rebuilder failed to properly polish the shaft on a buffing wheel. If the shaft has no physical damage from corrosion, etc., is properly polished, is assembled with a new o-ring, and with proper lube (like Parker O-lube or their newer product), the cylinder will last nearly as long as a new one (with respect to external leaks).

    My understanding, from Beech Technical Support, is that the 169-380100-1 has been superseded by the 169-380100-3. As you can confirm in the RAPID parts search, this is in fact the Cleveland Wheel And Brake CLB10-55 cylinder. Beech has these in stock for $358++, if you want it in a bag with their name on it. Since the 10-55 has exploded in price during the past five years, you may be stuck paying a high price if you have to buy new. I would try some online searches. If no luck, try calling Rick Leatherwood at Arrell Aircraft, where we get a BAC discount on Beech parts. Their link is on BAC. Wicks currently has the 10-55 for $175 (page link follows, be sure to copy the full link):
    http://www.wicksaircraft.com/catalog...11~subid=1285/

    ******************************


    ---------- Original Message ----------------------------------
    From: "Kerry Muller" <kmuller@csc.com>
    Date: Wed, 25 Jan 2006 19:10:34 -0000

    <html><body>


    <tt>
    I'm in annual and as usual running around trying to source parts. <BR>
    Anyone have a source for Cleveland master cylinders PMA # 010-05500? <BR>
    <BR>
    I have two on the copilot side that are still the original master <BR>
    cylinders (and leaking) and he's suggesting going with the new ones <BR>
    instead of rebuilding.<BR>
    <BR>
    Kerry<BR>
    6629R<BR>
    <BR>
    <BR>
    <BR>
    <BR>
    </tt>


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  2. #2

    master cylinders

    For Sierra owners, it is worth noting that all of this excellent advice
    is also very much valid for the hydraulic actuators used in the Sierra's
    landing gear. Don't ask how I know... just make sure to check yours at
    the next annual for hard o-rings, pits on the shafts, and spots where
    someone has taken a pair of vice grips to the seal covers. All that
    stuff should always look brand new.

    Michael Rellihan wrote:

    >
    > Here is the FAQ on BAC for this subject. Just do a BAC search on
    > 'master cylinder' if you need it again in future. Another example of
    > the scope of valuable information at your fingertips on the BAC
    > website, available to members for their modest annual dues payment.
    > If you call around for the parts, you can ask by both the Beech number
    > and the CLB number.
    >
    > **********************
    > One of our brake master cylinders is leaking again. It's had the
    > o-rings replaced three or four times, but always leaks again after a
    > year or so. I saw posts recently that the Gerdes master cylinders
    > (which we have) are no longer available. Is there any replacement for
    > them? Any source for used ones? Beech part number is 169-380100-1 and
    > Gerdes part number is A-110 43.
    > Thanks
    >
    > Editor:
    >
    > Assuming that the cylinder shaft is not corroded or pitted, there are
    > four main reasons why a new shaft o-ring does not hold up:
    >
    > 1. A cheap o-ring was used, rather than a proper Mil-spec o-ring that
    > is oil-resistant.
    >
    > 2. The shaft is corroded, pitted, or has flaking chrome. This is not a
    > rebuildable part (at least, not at a reasonable cost).
    >
    > 3. The gland bushing that contains the shaft o-ring, and through which
    > the shaft passes, has been worn to a slightly oval shape due to many
    > years of slight shaft contact. The o-ring will no longer seal, once it
    > has hardened slightly in service (especially in cold weather).
    >
    > 4. Maybe 80 times out of 100, the cylinder was rebuilt with a
    > serviceable shaft, but the rebuilder failed to properly polish the
    > shaft on a buffing wheel. If the shaft has no physical damage from
    > corrosion, etc., is properly polished, is assembled with a new o-ring,
    > and with proper lube (like Parker O-lube or their newer product), the
    > cylinder will last nearly as long as a new one (with respect to
    > external leaks).
    >
    > My understanding, from Beech Technical Support, is that the
    > 169-380100-1 has been superseded by the 169-380100-3. As you can
    > confirm in the RAPID parts search, this is in fact the Cleveland Wheel
    > And Brake CLB10-55 cylinder. Beech has these in stock for $358++, if
    > you want it in a bag with their name on it. Since the 10-55 has
    > exploded in price during the past five years, you may be stuck paying
    > a high price if you have to buy new. I would try some online searches.
    > If no luck, try calling Rick Leatherwood at Arrell Aircraft, where we
    > get a BAC discount on Beech parts. Their link is on BAC. Wicks
    > currently has the 10-55 for $175 (page link follows, be sure to copy
    > the full link):
    > http://www.wicksaircraft.com/catalog...11~subid=1285/
    > <http://www.wicksaircraft.com/catalog/product_detail.php/pid=4611%7Esubid=1285/>
    >
    > ******************************
    >


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