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have 2000 boxster S and will be looking closely at the booster and Master cylinder.
they are 20 yrs old so possible it's time to replace.. watched a number of videos and can't believe the design allows water to seep in... planning to pull the mc and booster and replace with new, bleed and hope that solve my issue..
that issue being, i was driving about 55 mph and the rear brakes starting clamping without me even on the brakes... pulled of the highway and lucky was able to get close to plaza though stuck in middle of road...
cooled down about 20 mins and drove home... no issues
drove again after a week and same problem and brakes no letting go..
only weird thing i did was pull the car out of winter storage after about eight weeks no driving... previous last drive was through a snow storm so may took in some moisture or salt... the boxster performed well with snow tires and about 4-6 inches of accumulation in about 3hrs... then got to rainy wet area so had some water or road salt mixed in, parked it eight weeks, pull it out of storage this problems shows up
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