The disc brake remains locked primarily due to mechanical seizure of the caliper piston or guide pins, a failed wheel bearing causing excessive runout, contaminated/burned brake fluid, or issues with the electronic parking brake (EPB) actuator. In the UAE's harsh conditions, the leading cause is corrosion and dust ingress jamming the caliper's moving parts. For example, a 2018-2022 Toyota Land Cruiser or Nissan Patrol driven frequently on dusty desert roads may see the guide pins seize within 3-5 years, requiring a full caliper service. According to workshop data from RTA Dubai-approved centers, caliper-related lock-ups account for over 60% of non-accident related braking complaints for GCC-spec SUVs. The MOI UAE's vehicle inspection guidelines mandate checking for brake drag and binding, which is a common reason for test failure, especially in older vehicles. Repair costs vary significantly: a simple guide pin clean and re-grease might cost 150-300 AED per axle, while replacing a seized caliper on a common sedan like a Toyota Camry can range from 800 to 1,500 AED for parts and labor. The total cost of addressing this (TCO) isn't just the repair; it includes accelerated wear on the related brake pad and disc, and reduced fuel economy—a locked brake can drop efficiency by 10-15%, which at UAE fuel prices (Special 95 at ~3.00 AED/l) translates to an extra cost of about 0.15-0.25 AED per km for a typical SUV. Annual depreciation is also impacted, as a recorded brake system fault on a vehicle's service history can reduce its resale value by 2-3% in the UAE's used car market.
