2017 SEAT Leon 1.4L Petrol · NG17 BCZ

The defining mechanical narrative for this 2017 SEAT Leon is a rear suspension and braking system that has been progressively flagged across consecutive MOT tests, culminating in a Major failure in August 2025 for a serious fluid leak from the nearside rear shock absorber. The most recent test on 13 August 2026 returned a Pass, but not before recording advisories for worn and pitted front brake discs along with thinning front brake pads, suggesting that the front braking hardware is now approaching the same condition previously documented on the rear axle a year earlier. The progression is worth noting: in 2024 both rear shocks were already showing light oil misting, by 2025 the nearside unit had deteriorated to a fluid leak sufficient to fail the test, and the rear brake pads and discs were simultaneously flagged as thinning and scored. The 2026 pass, while clean of failures, is therefore not a return to a fully healthy state but rather a reflection of components that were either repaired or have not yet crossed the failure threshold. Against an average annual mileage of roughly 16,948 miles per year, this Leon sits firmly in the high-use category for its age, and the DVSA record corroborates consistent road presence with tests recorded in 2021, 2022, 2023, 2024 (twice, due to the failure), 2025 (twice, for the same reason), and 2026. The lack of long gaps between tests indicates the vehicle has not been laid up for extended periods, which reduces the risk of seized calipers, perished coolant hoses, and dormant 12V battery degradation, but the high cumulative mileage of 152,532 miles means that wear items such as suspension bushes, engine mounts, clutch, and dual-mass flywheel (if applicable to the transmission) will be operating well past their typical service life expectations. For a prospective buyer, the rear suspension should be the primary area of physical inspection, given the documented history of shock absorber oil leaks. On a test drive, listen for clonking or knocking noises from the rear axle when traversing speed bumps, broken tarmac, or potholes, and pay particular attention to any continued damping loss that allows the body to oscillate more than twice after a sharp downward press on each rear wing. The nearside rear shock has already failed once, and without confirmation of replacement with a quality OE-equivalent unit, the offside unit — which was already misting in 2024 and 2025 — represents a near-term replacement candidate. Inspect the rear spring seats and upper mountings for any corrosion staining that could indicate prolonged fluid contamination of the surrounding bodywork. The braking system requires equally close attention, with both the front and rear axle components having been flagged within the last two test cycles. On the road, test for any pulling to one side under moderate or firm braking, which would suggest a binding caliper — a common consequence of infrequent use or worn slider pins on a high-mileage vehicle. Feel for brake pedal pulsation through the foot during a controlled 50 to 60 mph stop, which would confirm the disc run-out or thickness variation suggested by the pitted and scored advisories on both axles. Finally, check that all tyres are matching in brand, size, and tread depth, given the nearside rear was flagged for edge wear in 2024, and verify the windscreen washer system is fully functional with adequate fluid delivery to both the front and rear jets, as this was a PRS failure in 2024 and is a simple but easily overlooked item on a pre-purchase inspection.