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Bleeding Brakes

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geather

Joined: 06 Feb 2008
Posts: 23
Location: Mt Hutton Australia

Posted: Mon Nov 21, 2011 11:08 pm Post subject: Bleeding Brakes

Group,



What's the trick to bleeding the dual brake system on the Lightning?



Two attempts today were a failure. I tried "pumping" the fluid in from the bleed valves. One side (left) seemed to go okay but when the right side was injected, air appeared in the system (both sides!). 



I suspect the problem is that the loops of brake line connecting the two sides are higher than the master cylinder. Is this correct?.  



Any comments would be appreciated.



Thanks



Geoff Eather (Kit 127) Will be flying in < 2 weeks. (If I can get the brakes sorted !!)

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_________________
ge

winky53(at)hotmail.com
Guest

Posted: Tue Nov 22, 2011 5:13 am Post subject: Bleeding Brakes

Geoff,  I used a piece of hose connected to a syrindge and drew (sucked) out the brake fluid from each wheel one at a time making sure the master cyclinder does not go dry. Also, I found that if you get the system completly bleed the the brakes are very touchy and when trying to add right rudder for take off, seems as if the right brake get engaged also. Nick has a way of letting the T bar lay back some so when you push on the rudder pedals you are not applying the brakes also.  Gary N428GW

  > From: geather(at)bigpond.net.au

 	  Quote: 	
		   Subject: Bleeding Brakes

 Date: Tue, 22 Nov 2011 18:04:20 +1100

 To: lightning-list(at)matronics.com

 --> Lightning-List message posted by: Geoff Eather <geather(at)bigpond.net.au>

 Group,

 What's the trick to bleeding the dual brake system on the Lightning?

 Two attempts today were a failure. I tried "pumping" the fluid in from the bleed valves. One side (left) seemed to go okay but when the right side was injected, air appeared in the system (both sides!). 

 I suspect the problem is that the loops of brake line connecting the two sides are higher than the master cylinder. Is this correct?. 

 Any comments would be appreciated.

 Thanks

 Geoff Eather (Kit 127) Will be flying in < 2 weeks. (If I can get the brakes sorted !!)

==

  [quote][b]

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nick(at)flylightning.net
Guest

Posted: Tue Nov 22, 2011 7:27 am Post subject: Bleeding Brakes

Geoff,



Try unbolting the bottom of the master cylinders and rotating them up,

so that the MC's are inverted from where they are now. The design of the

cylinder keeps a small pocket of air trapped in the end opposite the

plunger. Also make sure your brake line goes to the bottom of the

caliper as in last months news letter. 



We bleed from the bottom up and the MC inverted and lines fitted to the

bottom of the caliper, seems to work fine this way.



Nick Otterback

Arion Aircraft LLC



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geather

Joined: 06 Feb 2008
Posts: 23
Location: Mt Hutton Australia

Posted: Tue Nov 22, 2011 10:28 pm Post subject: Bleeding Brakes

Gary and Nick,



		re:  Bleeding Brakes



Thanks for the advice. 



I think the problem was the master cylinder (and the "T" connector) below the level  of the brake line loops connecting the two sides. When I raised the MC  (and the "T" connector) well above the rest of the system there was no problem.



Cheers



Geoff Eather

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_________________
ge

checkpoint2(at)comcast.ne
Guest

Posted: Thu Nov 24, 2011 9:33 am Post subject: Bleeding Brakes

Hey Nick, I have changed computers can you put me back on the 

News letter address list?

        I'm supposed to get N 330BH back from Max next week, I'm looking 

foreword to it.  Bob Haas.



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