Re: E-Bay Q
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Steve <sham@...>
Bob, I had the same problem with calipers and master. You can change all seals to different ones made for DOT fluid' or use the OEM one"s with red aviation fluid. I choose the later.
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SteveHam ----- Original Message -----
From: Bob Farnam To: Q-LIST@... Sent: Thursday, February 24, 2005 11:46 AM Subject: RE: [Q-LIST] E-Bay Q Beware of Dot 5 if you are using the Airheart brakes. It is compatible with Cleveland or Matco brake systems, but not Airheart (unless they have changed their seal compounds in the caliper). I tried Dot 5 early in the game (1998) and had massive leaks develop in the calipers. A switch to aviation red fixed the problem and I've had no more leaks. I use Matco master cylinders and Airheart calipers. Bob F. N200QK -----Original Message----- From: James Postma [mailto:james@...] Sent: Wednesday, February 23, 2005 9:26 PM To: joseph.m.tygart.alion@... Cc: Q-LIST@... Subject: Re: [Q-LIST] E-Bay Q Hi Joe, I thought you bought an airplane that flew in from my part of the country. How come so many problems? What kind of brake fluid are you using? If you are not using aircraft fluid, get some. I have had nothing but trouble with transmission fluid. No special tools required. You must bleed from the top bleed port on the calipers. Pressure bleeding from the bottom and standard bleeding from the top will both work. One problem is that the bleed screw must be turned open to get fluid in/out and when you do this, there will be air going into the line. So you should attach a tube to the screw with fluid in it and open the screw when there is positive fluid pressure to keep air out. I had a unique problem with one airplane. The master cylinder was attached to a parking brake valve with a solid line. When I pulled on the brake handle, the solid line put tension on the connection to the valve and created a leak. You could also use dot 5 auto fluid but must first purge all the remaining fluid in the system with paint thinner and disassemble the pistons and clean them out (both master and calipers). When dot 5 mixes with dot 3 or aircraft fluid it becomes a jelly. The great thing about dot 5 is that the seals will not deteriorate. The US military uses dot 5 for this reason. Hope this helps. James Postma Q2 Revmaster N145EX Q200 N8427 Steilacoom, Washington (253) 584-1182 9:00 to 8:00 PDT May your header tank be always full and your wings right side up. ----- Original Message ----- From: <joseph.m.tygart.alion@...> To: <Q-LIST@...> Sent: Wednesday, February 23, 2005 6:19 AM Subject: RE: [Q-LIST] E-Bay Q > > Oh ye of knowledge - In my endless crusade to restore N672CP to a flyable > condition, I have upgraded the brake mounting bracket and serviced the > "Airheart Brakes." After totally dismantling the brakes & purging the old > mineral oil fluid from the system, I am unable to completely bleed the > brakes, i.e. with the first compression of the brake cylinder (conventional > arm rest mounted handle) I consistently get air in the line with negative > brake. These are the differential type Airhearts' with independent > approximate 5" brake cylinders with 1 ea. bleed valve per cylinder. The > calipers have 2 ea. bleed valves. I've tried bleeding from the top down and > several times from the caliper bleed valve up through the cylander valve > with a "mityVac" vacuum system! No luck. Realizing this is a hybrid old > system - is there a special tool or technique I'm missing or should I scrap > the Airheart system altogether? Thanks, Joe > > Quickie Builders Association WEB site http://www.quickiebuilders.org Yahoo! Groups Sponsor ADVERTISEMENT ---------------------------------------------------------------------------- -- Yahoo! Groups Links a.. To visit your group on the web, go to: http://groups.yahoo.com/group/Q-LIST/ b.. To unsubscribe from this group, send an email to: Q-LIST-unsubscribe@... c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. Quickie Builders Association WEB site http://www.quickiebuilders.org Yahoo! Groups Sponsor ADVERTISEMENT ------------------------------------------------------------------------------ Yahoo! Groups Links a.. To visit your group on the web, go to: http://groups.yahoo.com/group/Q-LIST/ b.. To unsubscribe from this group, send an email to: Q-LIST-unsubscribe@... c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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