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I would not touch the master cylinder yet. I believe you have a problem with the linkage or airpack. Do you have dual airpacks ? Check the linkage going to the master cylinder. If your brakes are not fully adjusted the "throw" of the linkage can be too much. Sometimes this can cause the...

Also I forgot to add last night that if this hole has not caused problems for the last 3 to 4 decades, it is not the problem now. The problem is gunk in the system like I said earlier. Did you replace all the flexible hoses when you did your brake system ? They can rot from the inside out...

When I read the part about "removing it" I had assumed he meant eliminating the hole to remove the problem. Now since there is debris in the system it needs to be cleaned out.

Which small hole are you talking about ? Is this one on the bottom of the reservoir ? If so "NO" you cannot plug it. That is your bleed/return hole for the fluid. If your fluid has gunk in it, then you need to totally clean out your brake system. More then likely you have 'O' rings/seals that...