Ivor,
Thanks for the detailed info. I am about to recommission my fingerbrake system.
The original seals were sticking and I changed them . Now I notice that one of
the new ones is sticking again. I don't want to change the brake caliper
seals.Exactly
what should I use, assuming I use your same supplier. Also, how do
you change the seal which is part of the piston; does that come apart somehow
or do i replace the whole unit and what is the part number ? Can I use automatic
transmission fluid with the existing caliper brakes ? I was using Dot5 and
intended using that again. Any advice much appreciated.
Karl
From: "ivor.phillips" ivor.phillips@ntlworld.com
Subject: Europa-List: Fw: FINGER BRAKE SEALS
Date: Fri, 23 Apr 2004 08:05:53 +0100
-- Europa-List message posted by: "ivor.phillips" ivor.phillips@ntlworld.com
Ivor Phillips
XS486 London UK
CM Installed, rudder cables complete,
trial fit top and wings,Undercarriage fitted,playing with tie bar
----- Original Message -----
From: ivor.phillips
Subject: FINGER BRAKE SEALS
Hi guys
This might be of interest to a few of you, building tri-gears with the factory
finger-brake mod 65.
For lots of reasons I wasn't happy to use the Silicone brake fluid DOT5 in my
plane,being
assured that the master cylinder seals were combatable with automatic
transmission fluid, I left the seals soaking for a week to see if there were
any adverse affects, Three of the four seals where fine, but surprisinglyone
cup seal had swelled to nearly twice its original size, so they were chucked,
The seals used in the master cylinder are 3/4 inch ring and cup seals, to be
combatable
with mil-h-5606 they need to be made of Buna-n-(nitrile) Or if you are
using glycol base DOT 3/4/5.1 then they need to be Ethylene-proplene,
My seals were obviously a mix of the two! so I sourced Girling SP2044 ring seals
and Girling SP3694 cup seals and rebuilt the master cylinder,
The Matco brake caliper seals are Buna-n-(nitrile) so these were changed to 222
EPDM (Ethylene-Proplene) Fairway seals http://www.fairwayseals.com/
Bleeding was as simple as filling the reservoir with a small funnel, cracking
open
a bleed nipple and watching the air being expelled! ( No pumping nessary)
Ivor Phillips
XS486 London UK
CM Installed, rudder cables complete,
trial fit top and wings,Undercarriage fitted,playing with tie bar
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