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matronics(at)bob.brennan.
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 Posted: Tue Aug 12, 2008 6:39 pm Post subject: Hydraulic brakes |
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After reading entries on this list about ground-looping I realised that I
needed to check my hydraulic brakes on my Model 2 to be sure that when I add
some braking it is working as it should. The right brake depresses slightly
and then locks up the wheel, the left depresses all the way with no effect.
Where do I start? I am assuming I should first add some fluid, but where and
how? I know nothing of the braking system but it appears to be 2 separate
very simple systems with fluid in a container activated by the toe pedals -
then pressure fed via tube to the disc brake callipers on the wheels(?)
Thanks in advance for any insight,
Bob Brennan
1991 UK Model 2 Kitfox
Rotax 582 with 3 blade prop
Wrightsville Pa
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Guy Buchanan
Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA
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| Posted: Tue Aug 12, 2008 7:52 pm Post subject: Hydraulic brakes |
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At 07:38 PM 8/12/2008, you wrote:
| Quote: | Where do I start? I am assuming I should first add some fluid, but where and
how? I know nothing of the braking system but it appears to be 2 separate
very simple systems with fluid in a container activated by the toe pedals -
then pressure fed via tube to the disc brake callipers on the wheels(?)
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I like to push the fluid up-hill. That way the bubbles are
encouraged to migrate to the top. Now my system is designed to take
advantage of that, with the calipers at the bottom, the cylinders in
the middle, and the reservoir above. I use a small pump oil-can to
pump the fluid in through the caliper. My reservoir has a pipe thread
top that I can install a brass 90 degree barb to a clear hose which
goes in a glass jar. My brake lines are all clear so I pump until I
don't see bubbles below the reservoir.
Guy Buchanan
San Diego, CA
K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar.
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Guy Buchanan
Deceased K-IV 1200
A glider pilot too. |
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dave
Joined: 22 Sep 2006
Posts: 1382
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| Posted: Wed Aug 13, 2008 1:26 am Post subject: Re: Hydraulic brakes |
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| Quote: | Where do I start? I am assuming I should first add some fluid, but where and
how? I know nothing of the braking system but it appears to be 2 separate
very simple systems with fluid in a container activated by the toe pedals -
then pressure fed via tube to the disc brake callipers on the wheels(?)
Thanks in advance for any insight,
Bob Brennan
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Bob, put oil can home on caliper bleed screw - open bleeder and pump untill the air is done coming out.
Type of oil -- There is only one oil that you can use http://www.cfisher.com/aeroshell.html it is MIL SPEC oil .
DO NOT USE AUTOMOTIVE BRAKE FLUID !!!!!
Hope this helps.
Dave
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Tom Jones
Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA
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| Posted: Wed Aug 13, 2008 4:39 am Post subject: Re: Hydraulic brakes |
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| Quote: | The right brake depresses slightly
and then locks up the wheel, the left depresses all the way with no effect.
Where do I start? |
Make sure absolutely all the air is out of the system. I left about 1/4 to 1/2 inch of air in the line to one master cylinder. That line looped down from the entrance port on the master cylinder then back up to the reservoir. I tried and tried but couldn't get that bubble out of the low spot in the line. The brakes worked fine for about 30 hours of flight time. Then on pre flight one day that brake peddle went all the way down.
I took the master cylinder apart and it tested good on the bench. Back on the plane it still went down. That little bubble was still in the line so I turned the entrance fitting up so the bubble worked its way up to the reservoir and the brakes worked again.
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Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA |
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