Our trusty '90 Monty suddenly is losing brake fluid while sitting. The reservoir is half empty a week after filling it.
So, it appears I need a new master cylinder. Does anyone have recommendations for a specific brand for a replacement master cylinder?

Attached Files
MASTER CYLINDER.JPG (115.14 KB, 9 downloads)
90 LWB RS: 3 L/mt, JBaker springs, bushings, swaybars. KYB shocks tweaked, 134k mi, original owner.
97 LWB SR: SOLD Sep. 2014 131,006 mi: running boards removed, BFG 31x10.5 AT/KO tires, Air locker, AirLifts, KYB shocks, Cibie fogs, 3rd owner.