2015 SEAT Leon 1.6L Diesel · OY65 EJD

A clear pattern of parking brake and rear undercarriage deterioration defines the recent mechanical history of this SEAT Leon. The 2025 test sequence is the most telling: a failure was recorded on 22 September 2025 with a Major defect for the nearside parking brake being inoperative on one side and a second Major for parking brake efficiency falling below requirements, accompanied by advisories for rear subframe corrosion and a binding nearside rear service brake. The very next day, on 23 September 2025, the vehicle was presented again and passed, but the rear subframe corrosion advisory and the binding brake advisory both remained, meaning those issues were not rectified between the two tests. Earlier in 2024, a similar parking brake problem caused another failure, with the lever recorded as defective so it could not be satisfactorily operated. Across seven recorded tests between 2020 and 2025 there are therefore two failures, both related to the parking brake mechanism, alongside a now-repeatable advisory for subframe corrosion and a newly emerging advisory for a binding rear caliper. The overarching trend is one of accumulating rear axle and handbrake concerns rather than stable roadworthiness. At 89,714 miles on an eleven year old car, the average annual accumulation works out at roughly 8,156 miles per year, which sits within typical expectations for a vehicle of this age and class. There are no significant gaps in the testing record, with annual MOTs consistently captured from 2020 through 2025, indicating the car has remained in regular use rather than being laid up for extended periods. This consistent, moderate mileage pattern is mechanically significant because the wear being recorded is genuine working wear rather than deterioration from standing, yet it has still been sufficient to produce repeat parking brake faults and the first signs of structural surface corrosion on the rear beam axle. Mileage progression across the recorded tests appears steady rather than erratic, so the components flagged should be interpreted as age and use related rather than indicative of unusual stress. For a prospective buyer, the rear subframe corrosion advisory flagged at both the 2025 failure and the 2025 pass warrants close physical inspection. The subframe on the Leon is a load bearing component that supports the rear beam axle and suspension, and although the tester judged the corrosion not seriously weakened on this occasion, such conditions progress with further winter salt exposure and road grit. On inspection, crouch behind the rear wheels and look along the transverse beam and its mounting brackets for flaking, scaling, or any perforating rust, paying particular attention to the box sections where the trailing arms and shock absorber mounts attach. Corrosion in these load path areas can rapidly move from advisory to failure status, so any evidence of bubbling under the paint, fresh underseal applied over rust, or distortion of the mounting faces should be treated seriously. The repeat parking brake and binding caliper advisories are equally important to evaluate. With two parking brake related failures in 2024 and 2025 and a 2025 advisory for the nearside rear service brake binding, the handbrake cable, equaliser, rear caliper actuator mechanisms, and the rear brake shoes or caliper pistons should all be examined. On a test drive, listen for scraping or dragging from the rear wheels, particularly after the car has been driven and parked briefly, and check that the handbrake holds the vehicle firmly on a slope with the recommended number of clicks. A stiff or uneven handbrake lever travel, a rear wheel that feels hotter than the opposite side after driving, or a judder through the pedal under light braking would all be consistent with the recorded pattern. Given that the binding brake was noted but not rectified even after the failure, arranging a targeted inspection of the rear brake assembly and confirming the subframe condition with the car on a ramp would be prudent before committing to purchase.