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Brake Master Unit replacement for M10

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23 Sep 2021 19:28 #1 by Gordie Meade
Replied by Gordie Meade on topic Brake Master Unit replacement for M10
We replaced the O-rings in mine but were never able to get the parking brake to work correctly. The brakes work fine and the parking brake engages. Problem is that once engaged, it stays engaged. I finally just marked it inop and carry wheel chocks with me.
By the by. The wheel chocks I have are 3D printed plastic and weigh almost nothing, particularly compared to the ones I got from Sportys. Unfortunately, I cannot for the life of me remember where I got them. Anybody that's handy with a 3D printer can make them pretty easily and I would guess there's a market for them.

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17 Sep 2021 11:35 #2 by Scott Engelhart
Replied by Scott Engelhart on topic Brake Master Unit replacement for M10
    After realizing that there is NOTHING available for replacement or cross reference substitute for the M10 MC I removed and disassembled mine. An aluminum casting with stainless steel sleeves in the piston bores. No measurable wear in the bores or the pistons themselves. The O rings on the pistons however, were hard and were virtually flush with the piston, they are 46 years old. I have replacement O rings coming from Aircraft Spruce.This morning I had a phone conversation with Richard Pedersen, author of "Last of the Ercoupes, The Mooney M-10 Cadet" who describes the restoration of his M10. I asked him, in your book you stated that you rebuilt the master cylinder, just what did you do? He replied, "well, I cleaned it up and replaced the O rings, that's all you can do". I will report my results when things are reassembled.  
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15 Sep 2021 05:51 #3 by Michael Hainen
Replied by Michael Hainen on topic Brake Master Unit replacement for M10
You guys might check out this URL and it's link to Parker Hannefin .

lasar.com/seal-kits

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14 Sep 2021 19:38 #4 by Scott Engelhart
Replied by Scott Engelhart on topic Brake Master Unit replacement for M10
Laurent,
BOY are we in the same boat. I had requested an M10 master rebuild from Skyport and receive a kit with two O rings which don't appear to relate to our Gerdes master cylinders. I have not removed the cylinder rod/pistons yet, however I have a fair amount of master, wheel and caliper experience, I expect the bores in the master to be smooth aluminum,..... could you expand on the "damage rubber coating" and what seal(s) did your guy replace?? LET'S KEEP IN TOUCH ON THIS ISSUE.
Scott Engelhart
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608-526-9199
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02 Sep 2021 12:32 - 02 Sep 2021 12:33 #5 by Laurent Crombet
Brake Master Unit replacement for M10 was created by Laurent Crombet
Hi all,
Sorry for the duplication of this post: I have initially posted this call in the general Ercoupe Tech forum but I am now convinced that the part I am looking for is M10 specific and I hope I will find here folks who have possibly encountered the same issue before.

My mechanic cannot find any replacement to the Brake Master Unit P/N SBC 9201-1 made by "Gerder Product", see pictures attached. Univair has not. The mechanic has replaced the seal but it seems that the problem comes form the inside of the cylinder whose rubber coating is damaged.
Do you know where elsewhere we could find this item? Did you face this problem in the past and find a workaround?
Thanks a lot for your help!
Laurent
 
 
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Last edit: 02 Sep 2021 12:33 by Laurent Crombet.

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