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
Watch on YouTubeBrake disc
BMW
1 121 387
BMW
1 152 571
BMW
1 153 140
BMW
1 162 968
BMW
1 163 140
BMW
34 21 1 121 387
BMW
34 21 1 152 571
BMW
34 21 1 153 140
BMW
34 21 1 162 968
BMW
34 21 1 163 140
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Watch maintenance and replacement tutorials on YouTube.
9:44Driving Academy | CDL Truck Driving School
Watch on YouTube
14:21
5:57A 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 10 OE-compatible part number(s), shown in the compatible parts section above.