I recently replaced both my air over hydraulic master cylinders and the old ones started to leak. .So I spent lots of money, needlessly .
I bought 2 "suitable replacements" cost over $500 each.
but just didn't seem right.. I suspect due to two things, a plugged front rubber brake line and not bleed correctly.
after they were installed and usable
I found a place who will rebuild them, and is very cost effective.
very helpful people with lots of information.
total cost to rebuild 2 master cylinders was less than $300..
They are : Welcome to Precision Rebuilders.com
I bought two of the usable replacement ones but they had a different feel and I didn't like that.. so I found this place and they rebuilt mine and were quick, low cost and very forthcoming with information.
Attn Tim. 1-800-325-2690
350 north commercial ave
St Clair Mo 63077
thank you .