Vehicle properties
Tyres, brakes & chassis
BRAKE_PAD_WEAR_PERCENTAGE
What it is
Brake pad wear percentage.
This property must communicate the amount of brake pad wear accumulated by the vehicle as a percentage. This property return a float value from 0 to 100.
0 indicates the brake pad has no wear. 100 indicates the brake pad is maximally worn.
How the ID is built
A property ID is a 32-bit value packing four fields. Reading 0x17600311 apart:
| Field | Mask | Value | Means |
|---|---|---|---|
| Group | 0xf0000000 | 0x10000000 | SYSTEM |
| Area | 0x0f000000 | 0x07000000 | WHEEL |
| Type | 0x00ff0000 | 0x00600000 | FLOAT |
| Ordinal | 0x0000ffff | 0x00000311 | 0x311 |
Reading it from an app
CarPropertyManager mgr = (CarPropertyManager)
car.getCarManager(Car.PROPERTY_SERVICE);
float value =
mgr.getFloatProperty(VehiclePropertyIds.BRAKE_PAD_WEAR_PERCENTAGE, areaId);This property is read-only — writes are rejected. It fires a callback whenever the value changes.