Brake Disc Caliper problems of the 2016 Mazda MAZDA3

Water gets into the trunk and fills up the spare tire well. Causing mold and rust inside trunk. Throughout baring inside clutch/transmission component explodes destroying the clutch and transmission. Parking break doesn't disengage correctly causing brakes to wear down quickly. Water getting into rear break calipers making them defective. This has happened mainly in city street driving but noticeable on the highway.

My passenger rear caliper froze causing the pad on the outboard side to wear down to metal while the inboard pad still had half of its life left. This is behavior similar to NHTSA recall 17v393000 but my VIN does not fall within the parameters of the recall. The vehicle has 58,000 miles on it and is driven mainly on the highway.

Car serviced per recall, NHTSA camp. No. 17v393000, Mar. 2018. Dealer stated no corrosion on ramp shaft found, so boots installed w/out caliper replacement. Car brought to dealer Jun. 2018 b/c rear brake indicator squealing. Dealer found that piston (post-recall) had bound for unknown reason. Dealer replaced caliper. Owner tested parking brake lever on old caliper and verified it was not binding. (but owner could not remove nut to check for rust at 1. 6mm area of ramp shaft. ) owner reporting to NHTSA b/c concerned that Mazda3 caliper-binding issue may extend not just to ramp shaft but also to other parts of caliper, including piston.

Parking brake safety recall on the mechanical (cable) type parking brake, water may enter the brake caliper due to inappropriate sealing performance of the rear brake caliper protective boot, particularly under low temperature conditions, and the parking brake actuator shaft, which is the component of rear brake caliper, may be rusted.