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Bill,
This procedure worked beautifully ... for the RV4
Using an RC airplane rotory, or suitable pump, the pump being fed from a plastic jar (resevoir), through the wheel cylinder, up to the master cylinder, empasis on "up", up to the fire wall resevoir (highest point in the brake system), a fitting then screwed into the top of the firewall reservoir and a line returning down to the pump reservoir. There was no brake fluid lost. The bleed line used was 1/4" see-through plastic hose from ACE (aircraft consumables & equipment).
Helping all this was: using an in-line capped T fitting at the top of the brake line going to the top of the master cylinder. Also see-through nylon line (the standard RV4 stiff opaque nylon line) connecting the bottom of the master cylinder to the firewall brake resevoir.
The procedure: cap the T fitting, pump fluid up to the master cylinder until it can be seen just starting up the line to the firewall reservoir, stop pumping. Repeat this procedure to the other wheel. Now open the top of the T's by removing the caps and let it rest 24 hours. Bubbles will migrate up and out the T and up and out to the firewall resevoir. Reinstall the T caps and tighten, finish pumping the firewall resevoir full and allow the line from the firewall resevoir, to the pump resevoir, to drain (watch the overflow tube clear-up). Plug the firewall resevoir .... done!
Good luck,
Jerry
----- Original Message ----- From: "Robert R Pastusek" <rpastusek@htii.com>
To: <lml@lancaironline.net>
Sent: Tuesday, December 28, 2010 8:53 PM
Subject: [LML] Re: bleeding brakes
Bill,
I's possible that the individual brake cylinders attached to the brake pedals are causing the problem. It could be any or all of the four (two on the left side/two on the right). If any cylinder is compressed even a small amount, it acts as a shut off valve for the fluid. The solution (for me) was to pull the top of each brake pedal aft as far as it will go. There's a spring on the cylinder so they should stay in position once "retracted." If you have a parking brake, that's also suspect; I'd be sure it's fully open.
For my money, adding fluid at the brake calipers is the only way to do it. This helps (but does not ensure) push air out of the lines as you fill...but even with this method, it may take several tries. This is also a two-person job; doing this alone is at the minimum bound to make a mess.
Hope this helps.
Bob
Bill H says:
Need some help with bleeding the brakes. I have replaced the nylaflow
tubing in my L-IVP and I am having a problem getting fluid back into
the lines.
I originally started from the bottom by attempting to pump fluid up
thru the fitting on the brake housing. No luck; wouldn't take the
fluid....big mess. Next, I filled up the reservoir and tried to fill
the lines from the top down; by pumping the hydraulic cylinders on the
rudder pedals. No luck...bigger mess. It seems like I am trying to
push the fluid thru a check valve, the wrong way.
Funny thing is that I can remember years back when I first installed the
brakes, I ran into the same exact problem. Cant remember what exactly
solved the problem but history seems to be repeating itself. Guess the
memory is worse than I thought. Can there be a sequence to bleeding
these brakes that I'm not aware of?
Happy Holidays, Bill Hogarty
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