Glen Davis Posted Tuesday at 02:14 PM Report Posted Tuesday at 02:14 PM Can anyone share with me the part number for the 0-ring for the brake nipple under the wheel on a 1989 M20J. It’s dripping brake fluid from the nipple and I want to change this part to see if that’s the culprit. Thank you.
LANCECASPER Posted Tuesday at 02:17 PM Report Posted Tuesday at 02:17 PM 2 minutes ago, Glen Davis said: Can anyone share with me the part number for the 0-ring for the brake nipple under the wheel on a 1989 M20J. It’s dripping brake fluid from the nipple and I want to change this part to see if that’s the culprit. Thank you. You might put what help you need in the title so later when someone is searching for the same thing you are they will have a better chance of finding it.
1980Mooney Posted Tuesday at 02:43 PM Report Posted Tuesday at 02:43 PM (edited) 33 minutes ago, Glen Davis said: Can anyone share with me the part number for the 0-ring for the brake nipple under the wheel on a 1989 M20J. It’s dripping brake fluid from the nipple and I want to change this part to see if that’s the culprit. Thank you. You might start by looking at the Illustrated Parts Manual. You will see diagrams in 32-10-01 for the landing gear and brake assembly (page 422 in the download - for the later models like yours) There are no o-rings on the nipples of any brake caliper - aircraft or auto. It is a metal to metal seal. Now don't go tightening that small nipple down until you snap it off. Are you sure that you don't have a leak from the piston o-ring or the hose which will to be running down and dripping off the nipple which just happens to be the lowest point on the brake caliper? These leaks can be hard to pinpoint unless you pull the fairing off and look closely. You may need to clean it off and observe over time. Edited Tuesday at 02:52 PM by 1980Mooney
OR75 Posted Tuesday at 03:00 PM Report Posted Tuesday at 03:00 PM 45 minutes ago, Glen Davis said: Can anyone share with me the part number for the 0-ring for the brake nipple under the wheel on a 1989 M20J. It’s dripping brake fluid from the nipple and I want to change this part to see if that’s the culprit. Thank you. the cleaveland brakes assembly catalog is readily available online 1
PT20J Posted Tuesday at 03:07 PM Report Posted Tuesday at 03:07 PM (edited) That’s called a bleeder. It’s a Cleveland brake part. Usually when they leak, the needle valve isn’t sealing and you need to replace it. If by chance it is leaking from the threads, you could remove the seat (large nut) and apply some pipe thread sealant to the threads and re-install it. Keep the brake fluid reservoir full until you get it fixed so you don’t get air in the lines. Bleeders are available from Aircraft Spruce. Edited Tuesday at 04:20 PM by PT20J Corrected text to state that valve is a needle valve and it is the seat that should have thread sealant applied. 1
Yetti Posted Tuesday at 03:17 PM Report Posted Tuesday at 03:17 PM As stated by others there is no O-ring on the bleeder. And it is not usually the leak. You can put a wrench on it and check to see if it is slightly above snug. While you are down there check to see if your brake pads need replacing. As the piston gets to the end of travel as the brake wear they get where the piston will leak around the o-ring in the caliper. This is most likely the cause of the leak. Refill your brake reservoir. The parts and service manual are in the download section
1980Mooney Posted Tuesday at 03:44 PM Report Posted Tuesday at 03:44 PM (edited) 1 hour ago, Glen Davis said: Can anyone share with me the part number for the 0-ring for the brake nipple under the wheel on a 1989 M20J. It’s dripping brake fluid from the nipple and I want to change this part to see if that’s the culprit. Thank you. Here is Cleveland brake assembly 30-56A which is what is on your plane. You can clearly see the bleeder valve. Edited Tuesday at 03:55 PM by 1980Mooney 1
hammdo Posted Tuesday at 04:36 PM Report Posted Tuesday at 04:36 PM http://www.speedbleeder.com/ may be able to find a match here — and they are very good! -Don
PT20J Posted Tuesday at 05:12 PM Report Posted Tuesday at 05:12 PM 35 minutes ago, hammdo said: http://www.speedbleeder.com/ may be able to find a match here — and they are very good! -Don Those don’t look like aircraft parts. 1
1980Mooney Posted Tuesday at 05:24 PM Report Posted Tuesday at 05:24 PM (edited) 3 hours ago, Glen Davis said: Can anyone share with me the part number for the 0-ring for the brake nipple under the wheel on a 1989 M20J. It’s dripping brake fluid from the nipple and I want to change this part to see if that’s the culprit. Thank you. 2 hours ago, PT20J said: That’s called a bleeder. It’s a Cleveland brake part. Usually when they leak, the needle valve isn’t sealing and you need to replace it. If by chance it is leaking from the threads, you could remove the seat (large nut) and apply some pipe thread sealant to the threads and re-install it. Keep the brake fluid reservoir full until you get it fixed so you don’t get air in the lines. Bleeders are available from Aircraft Spruce. When you look at the Mooney Illustrated Parts Catalog (IPC) for the M20J you will see that Mooney specified a Cessna part number for the bleeder valve - 37-206 Here is the cross-reference Brake Bleed Valves For Cleveland & Mccauley Wheels | Aircraft Spruce ® Edited Tuesday at 05:32 PM by 1980Mooney 1
1980Mooney Posted Tuesday at 05:35 PM Report Posted Tuesday at 05:35 PM You learn something every day. I didn't know that they sold caps for the brake bleed nipple. In over 25 years I have never had them on my Mooney and I don't recall ever seeing them on any plane. I think they just crack and fall off or if you are taxiing through grass maybe they get knocked off.
1980Mooney Posted Tuesday at 05:46 PM Report Posted Tuesday at 05:46 PM @Glen Davis If you are going to work on the brakes yourself here are a couple good videos.....not Mooney but still good 1
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