You should check with Matco. Are you sure the O-rings in the kit are
not for something else, say a Jamar master cylinder?
It was my recollection that Matco already uses Buna-N (which is nitrile!).
Check the on-line manual for the WE-51 and you will see the parts list
specs Buna-N o-rings.
Buna-N is not compatible with glycol based brake fluids like DOT 3, 4, or 5.1
Dot 5 is silicone based and is compatible
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Ira N224XS
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http://forums.matronics.com/viewtopic.php?p=367715#367715
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