Weird brake behavior
 

Friend with an '85 Targa had a strange experience today. Had been driving a bit, doing errands, stop and go traffic and out of the blue he went to brake the pedal nearly went to the floorboard. He pumped them back up, was able to get home and now everything is feels fine (but of course something's clearly wrong).

We checked the brake fluid reservoir and there's no discernible loss and no evidence of leakage around any of the calipers or lines.

Obviously not something to let go but curious if anyone has thoughts before he takes it in for an inspection.

Thanks,
JPaul

Master cylinder is kaput.

Yep, bypassing fluid past seals

My thoughts too.