9:44CDL Class A FULL In Cab Inspection and Air Brake Test 2023 - Pass Your CDL Trucking Road Test
Driving Academy | CDL Truck Driving School
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Brake disc
TOYOTA
42431-WAA01
BMW
3420 6 880 079
BMW
3420 7 915 314
BMW
3420 8 831 484
BMW
3420 8 853 554
BMW
3421 6 860 925
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9:44Driving Academy | CDL Truck Driving School
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14:21
10:20Smart Drive Test
Watch on YouTubeA brake disc (rotor) is the metal disc that the brake pads clamp onto to slow the wheel.
When the pads press against the spinning disc, friction converts the vehicle's motion into heat, which the disc dissipates; commercial vehicle discs are large and heat-resistant for high loads and repeated braking.
Mounted at the wheel as part of a disc brake. Because braking is safety critical, discs and pads are inspected on schedule and replaced by axle set by a qualified technician.
Yes — it is linked to 6 OE-compatible part number(s), shown in the compatible parts section above.