10:20Air Brakes Explained Simply :: Service, Parking and Emergency Brakes One & the Same
Smart Drive Test
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Brake disc
MERCEDES
000 421 20 12
MERCEDES
000 421 20 12/07
MERCEDES
172 421 06 00
MERCEDES
204 421 12 12
MERCEDES
221 421 08 12
MERCEDES
A000 421 20 12
MERCEDES
A000 421 20 12/07
MERCEDES
A172 421 06 00
MERCEDES
A204 421 12 12
MERCEDES
A221 421 08 12
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10:20Smart Drive Test
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14:21
12:53A 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.