One problem related to brake master cylinder has been reported for the 2002 Nissan Xterra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2002 Nissan Xterra based on all problems reported for the 2002 Xterra.
On 5/2/2012 at approximately 2:30pm in the afternoon vehicle traveling on a divided highway in moderate traffic at approximately 30mph. While braking for traffic at a stop light operator felt a sudden drop in the brake pedal and loss of stopping ability requiring them to swerve onto the shoulder to avoid the car in front of them. The vehicle was drivable but required more stopping distance to brake. Light smoke noted while stopped but none at speed. Upon stopping to investigate the light smoke, which was coming from the front right wheel area the hood was opened to investigate and a small flame was noted on the exhaust manifold which was extinguished with an abc extinguisher. Brake fluid noted to be low in the master cylinder. Vehicle towed to shop for investigation and repair. Brake line found to have been rubbing against exhaust manifold shielding which rubbed away the rubber protective liner over time allowing water/rain to slowly rust the brake line which burst and squirted brake fluid onto the manifold where it ignited. Online research shows this to be a known problem experienced/reported by other owners of same make/model. High potential for bodily harm via accident (inability to stop) and loss of property (fire).