I was wondering if anyone knows a good method to test the master cylinder? My pedal is doing the "slow drop to the floor", but I'm not losing any fluid based on the reservoir level and there does not appear to be any leakage anywhere else. The shoes and pads are somewhat worn, but not to the point they need replacement yet. I'm thinking master cylinder is failing, but wanted to do any tests possible before buying new parts.
I have misplaced my manual. Any tips appreciated.