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The M101A2 and the M101A3 use the same master. The venting system was changed from the A2 chamber cap to the vent line cap on the A3. either cap will work. The line vent seems to be the best system to be water proof and give normal atmospheric pressure to the master reservoir (14.7 PSI at sea...

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The chamber unit is the stock military on the A2 and allows the master to be watertight in heavy fording. The civilian unit will not be water tight for those kinds of service but fine for everything else. Mark http://www.silvermoonparts.com/category_s/1119.htm

Yes there is. You can get a chamber breather like on the A101A2 or get a civilian cap that has small holes drilled in it as I did. The civilian caps for the early 60s CJ-5 will fit as it was a very common master cylinder. Mine was for a 50s Ford. Hope this helps. Mark