2009 Citroen C1 1.0L Petrol · KX09 YOL

Chronic brake pipe corrosion across the rear axle is the defining mechanical concern in the DVSA record for this 2009 Citroen C1, and it has now persisted across consecutive tests. On the most recent examination dated 13 November 2025 the vehicle initially failed on a non-functioning nearside stop lamp, a straightforward electrical repair, and was subsequently presented again the same day and passed. However, both the failure and pass tickets carry the same advisories flagging the nearside and offside rear brake pipes as corroded and coated in grease or other material, an attempt to mask surface degradation. This represents the first set of advisories recorded in the eight-test history, which otherwise ran clean from 2019 through 2024, so the rear hydraulic circuit has effectively gone from an unrecorded condition to flagged within a single annual cycle and warrants close physical inspection rather than dismissal as cosmetic. Annual mileage of approximately 6,270 miles across seventeen years is broadly typical for a vehicle of this age, and the recorded progression from 2020 onwards suggests reasonably consistent if modest use rather than long periods of inactivity. There are no multi-year gaps in testing that would imply extended standing, which reduces the likelihood of dormant issues such as seized brake calipers, perished fuel lines, or a heavily sulfated 12V battery. The steady accumulation does, however, place sustained demand on consumable braking, suspension, and exhaust components, and at 106,594 miles the major mechanical assemblies are well into the second half of their expected service life. Routine replacement items such as the timing chain, clutch, and front suspension bushes should be assumed to be due or overdue on a car of this vintage and mileage, regardless of what the MOT record alone can confirm. For a prospective buyer, the immediate priority is a hands-on examination of the rear brake line condition. With both rear pipes now flagged as corroded, the grease coating may simply be a stopgap measure; surface rust on steel hydraulic lines on a seventeen-year-old car can progress to perforation and fluid loss under braking pressure. A thorough check should involve an inspection from underneath the vehicle, paying attention to the unions at the flexible hoses, the routing along the rear axle and underbody, and any evidence of fresh fluid seepage or wet staining on the inner wheels after the car has been driven. A test drive should include firm pedal applications to confirm the brake pedal feels firm with no sponginess, excessive travel, or pulling to one side, which would suggest a compromised seal or binding rear caliper rather than simple surface corrosion. Beyond the braking system, the test drive should be used to probe the suspension and steering for the wear typical of a higher-mileage small car. Listen for clonks or knocks from the front suspension over speed humps and uneven surfaces, which would indicate worn lower wishbone bushes, droplinks, or top mounts, and feel for any vibration through the steering wheel that could point to a worn tie rod or front wheel bearing. Given the age, inspect the exhaust system for corrosion at the mounting rubbers, joints, and rear silencer, and check the underbody and sill seams for rust bubbling through the paint, particularly around the rear wheel arches and jacking points where the Citroen C1 is known to deteriorate. Finally, verify that the stop lamp repair noted at the recent failure has been carried out properly, as a recurring electrical fault on such a simple circuit could indicate a poor earth connection or damaged wiring loom that merits further investigation before purchase.