2021 Audi Q3 S Line 35 Tfsi Mhev S-A 1.5L Petrol · RO13 YNJ

The defining mechanical concern with this 2021 Audi Q3 is a rear brake system that materially deteriorated between the clean 2025 test and early 2026, culminating in a failure on 26 February 2026 with the vehicle subsequently passing two days later once the defects were presumably addressed. The failure record is not a catalogue of minor issues: an offside rear brake disc was deemed significantly and obviously worn under the 1.1.14 (a) (i) criteria, the rear service brake was excessively fluctuating under 1.2.1 (e), the rear pads were noted as wearing thin, the nearside rear disc was pitted or scored, and the evaporative emission pipe was recorded as split under 8.2.1.1 (a). Two majors on the braking system on a single test indicate more than routine pad replacement was required; fluctuating rear brake effort combined with a significantly worn disc typically points toward either a binding or partially seizing caliper, a collapsed caliper piston, a worn or seized handbrake mechanism acting on the integrated drum, or a flexible brake hose allowing uneven hydraulic pressure. The evap pipe split is an emissions and vapour-leakage issue that warrants its own inspection, as a hairline split near a coupling can reappear after an apparently simple repair. Annual mileage at 38,796 miles over five years equates to roughly 7,759 miles per year, which is broadly typical for a family-sized SUV in the UK and not so low as to raise immediate concern about dried seals, stale fuel, or heavily sulphated battery issues. There are no multi-year gaps in the testing record that would suggest a long period off the road, and the four tests provided run consecutively from 2024 through early 2026, giving a continuous usage picture. With moderate rather than minimal mileage, the brake wear flagged in 2026 is consistent with normal urban and commuter loading rather than severe neglect, but the simultaneous disc wear, pad wear, and fluctuating brake effort on the same axle suggests a specific rear brake fault that should be verified rather than assumed resolved. For a prospective buyer, the priority on any viewing is a careful assessment of the rear brake system, given how recently it failed. On a road test, listen for any dragging or scraping noise from the rear wheels on a cold start, which can indicate a caliper that is not fully releasing; feel for pulling to one side under moderate braking, and check that the car does not roll excessively on an incline when the handbrake is engaged, as the rear discs on this generation of Q3 use an integrated drum-in-hat parking brake that is a known source of sticking and uneven wear. Inspect the offside rear disc face through the wheel for a visible lip and any blueing from overheating, and examine the nearside rear disc surface for the pitting noted at the last test, as the 2026 advisories suggest both sides were showing wear. Check the engine bay and undertray for any residual smell of petrol vapour and visually trace the evaporative emission lines from the charcoal canister toward the fuel tank for fresh clips, repaired sections, or any sign of an unaddressed secondary split. The 2024 advisory noting that engine and body covers were restricting inspection is also worth keeping in mind; during any pre-purchase inspection, request that those covers be removed so that oil leaks, mounting condition, and ancillary drive components can be properly viewed. Finally, verify the rear tyre age and sidewall condition directly, as the 2025 advisory recorded slight cracking and damage on the offside rear tyre that may now have progressed.