Coming home today after an hour ride....brake pedal goes to the floor.....whoa!....pump it up....it is fine again. Down the road a little slower and it does it again. Got it home and they work finr now. Crawled under, no wet spots.....nothing wet under hood and the brake fluid level is fine........what gives?????

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R