2007 Toyota 4runner Wheels Problems

VEHICLE PURCHASED USED JULY 2011 W/ 45K MILES. IN MAY 2012 AT 55K HAD BRAKES REPAIRED, ALL 4 WHEELS NEW ROTORS PADS AND HARDWARE. IN 2014 NOTICED BRAKE FLUID LEAKING FROM CALIPER AND DISCOLORING WHEELS. DEALER SERVICE VERIFIED FRONT CALIPERS FROZEN (GUIDE PINS AND PADS RUSTED IN PLACE AS WELL AS CALIPER PISTONS). THIS APPEARS TO BE A DESIGN FLAW AS THE CALIPER DOES NOT INCORPORATE ANY PROTECTIVE BOOT FOR THE GUIDE PINS OR ANY INTERFACE BETWEEN THE PAD SHOE AND THE CALIPER BODY. THE CALIPER BODY AND GUIDE PIN APPEAR TO BE EASILY OXIDIZED, A FACT THAT TOYOTA ATTRIBUTES TO "ENVIRONMENTAL CONDITIONS". APPARENTLY TOYOTA DESIGNS FOR THE MILDEST CONDITIONS RATHER THAN THE HARSHEST. ODDLY, IT IS ONLY THE FRONT CALIPER WITH THIS DESIGN: THE REAR CALIPER INCORPORATES A MORE MODERN DESIGN WITH A BOOT FOR THE GUIDE BOLT. *TR

TL*THE CONTACT OWNS A 2007 TOYOTA 4RUNNER. THE CONTACT STATED THAT HE WAS UNABLE TO REMOVE THE REAR DRIVER SIDE WHEEL WHILE TRYING TO REPAIR A FLAT TIRE. HE REMOVED THE BOLTS; HOWEVER, THE TIRE WOULD NOT DISENGAGE. AS OF OCTOBER 15, 2007, THE DEALER HAD NOT INSPECTED THE VEHICLE. THE DEALER INFORMATION IS UNAVAILABLE. THE CURRENT AND FAILURE MILEAGES WERE 16,000. THE VIN AND ENGINE SIZE WERE UNAVAILABLE.