BMW is recalling nearly 5,600 new X3 and X4 vehicles that could experience brake problems related to the rear brake caliper pistons.
BMW says an assembly worker was driving a vehicle and noticed the brake pedal traveling too far toward the floor. It was believed the problem was caused by contaminated brake fluid or possibly a faulty brake component.
BMW dealers started filing reports about the same brake pedal issues and the supplier confirmed the rear brake calipers may have been manufactured incorrectly.
The supplier, ZF TRW Global Braking, determined the rear brake caliper’s pistons may not have been sufficiently coated, causing gas to temporarily be trapped and then released into the rear brake circuit. This will cause gas pockets within the brake circuits and reduced braking performance.