Brake issue: is it the master cylinder ?, first noticed this yesterday- Options

[DRPHIL914]

75 914 2.0, have had the car 4 years, no braking issues- only put about 5,000 miles on it.

Ok, have not been driving the car much, last drive was a month ago, took it out for a spin last night, 30 minute drive. almost home , and i notice as i go into a corner and brake, i have to pump several times , first time pedal goes all the way down. this occurs again the next 2 stops before getting home.

- i check and fluid level is at 100%, and i can not find any leaking (IMG:style_emoticons/default/confused24.gif)

so seems like it must be a master cylinder issue, yes? any way to confirm besides just replacing the MC?

Thanks, Phil

Part 2 of this would be, if it is - what would be recommended?- i am getting ready to put on the 5 lug conversion and 5 lug fuchs, have not decided whether to upgrade the calipers while i am at it or not. Discussed ths with Eric, and since it is a casual cruiser with the occasional spirited twisting road drive, he recommended to stay will stock calipers , but a pad upgrade. - so no need to change to a 911 MC then, right?