Surface rust on its own is not automatically a fail in an MOT. What really counts is where the corrosion is, will be, and its consequential effect on structural strength or safety. MOT testers will be on the lookout for rust affecting some structural areas, as well as potentially impacting braking and steering.
Where rust matters most
Rust is most probably going to fail if it:
Is on parts that add strength to the vehicle
Attachment points for suspension, steering, or seatbelts
Brake components and pipes.
Corrosion in a “designated area” is one of the most reported phrases collectively described in an MOT. For MOT Gloucester, visit 123carandcommercial.com/mot-gloucester.
Typical problem spots:
Of course, every car is unique, but typically, developing rust can be found:
Sills and jacking points
Floorpan edges and chassis rails
Wheel arches and inner arches
Front and rear suspension mounting points
Subframes
What counts as a failure?
A tester isn’t testing for how pretty it is – they’re judging strength and security! If corrosion is bad enough that a structural area is compromised, or a part is being held on with just one spring, it can fail. Advisories may be recorded for lighter corrosion.
What to do before your MOT
Bubbling paint or flaky underseal shouldn’t be ignored
Arrange for an early inspection – because welding and repairs take time
Have them send photos to know exactly what needs repairing.
Finding corrosion when it is still early will, in general, be a lot less expensive than allowing it to become structural, and also helps keep your automobile safely on the road.