properties /identity

WHICH AXLE THE PART IS BUILT FOR, front or rear. Published as its own field by every house in the trade: Brembo's label guide names the field the `mounting axle flag` and glosses it as `indicates on which axle (front or rear) the brake pads are to be fitted`, and Textar puts the word in the product title itself — `Brake pads Front ... 2242501`, `Brake pads Rear ... 2627701`. IT IS NOT A FITMENT, and the distinction matters because the campaign's bounding ruling (operator, 2026-08-25) turns on it. A fitment is a CROSS-REFERENCE TO ANOTHER PRODUCT — `Toyota Vitz, Belta, IST` — and modelling it means holding a vehicle catalogue. This names no vehicle, no model, no engine and no year; it names the part's own intended service position, and the pool has held that kind of fact since long before this campaign: `installation_type` says built-in or freestanding, `mounting_type` says wall-mounted or pedestal. A wall is not a product cross-reference and neither is an axle. It is also the fact a front and a rear part actually differ BY: a rear part is smaller, usually a softer grade, and on a drum-braked rear it is a different form of part altogether. Filed under identity, so not axis-eligible — a front set and a rear set are two part numbers and two listings, never a toggle in one buy box. CARDINALITY MANY, on a real instance: EBC publishes its FA142 as `Front/Rear Organic Brake Pads` and its FA83 as `Front or Rear Brake Pads`, one article number fitting either end, and a cardinality of one could state neither. THIS SLOT IS ON NOTICE AND WILL LIFT [L5]. It is a fact about ANY part fitted to one end of a vehicle, not about friction: Brembo prints `Axle: Rear` on a brake shoe page with the same field it uses on a pad, and the data layer carries `Fitting Position: Front Axle` on discs, wheel bearings, shock absorbers, wheel cylinders and calipers alike. Three of those — the wheel bearing, the stabiliser link and the ball joint — are the very next vertical. The moment a second axle-side kind is seeded this property lifts to a common parent and `BrakeFrictionPart` is re-tested under [L3] with six exclusive slots; still a class, but re-test it then. The shape of H1-f6, H2-f7 and H3-f5.