[Tmac9494]

While taking the project out for a test drive after changing the MAF and Coilpacks/plugs, everything ran great. Drove 20 minutes on the interstate to my father's house and about 10 minutes into the test drive with him the brake pedal went to the floor suddenly, without warning.

I had to pump the brakes several times to get it to stop and they never felt strong. After we limped it back to his house there were no visible leaks, definitely smelled brake fluid, but the levels stay solid even after pumping the brakes a while. They feel normal again now though, going to try a drive on the street its parked on just to see if all the braking power is back.

Im just looking for other people's thoughts. Seemed like a master cylinder from the behaviour driving, and it does seem to maybe very very slowly continue to sink down after I start the car with pressure on the pedal. Went ahead and ordered one but we also noticed a clinking/clunking sound when hitting the brakes at the front right caliper.

Caliper behavior and the seeming return of brake pressure has me thinking the caliper may be engaged slightly and caused the fluid to boil, that would explain the smell with no leaks right? Didn't notice any pulling to one side at the time though or any grinding noise but it does seem reluctant to roll in neutral with a good heavy push.

Oh and while inspecting the MC with and hitting the brake pedal I heard like an air swooshing sound coming from the MC/Brake booster. Is that just the sound a brake booster makes when pushing the cylinder?

update info: 1999 boxster, has sat for a while before I started bringing it back to life