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| Manufacturer | Model | Version | Engine code | Construction type | Construction start | Construction end | Pk | Power kw |
 MERCEDES-BENZ |
| Manufacturer | Productnumber |
| MERCEDES-BENZ | 126 421 04 12 , 1264210412 |
| MERCEDES-BENZ | 126 421 05 12 , 1264210512 |
| MERCEDES-BENZ | A 126 421 04 12 , A1264210412 |
| MERCEDES-BENZ | A 126 421 05 12 , A1264210512 |
| Usage numbers |
| BD157 |
A brake disc (also called a brake rotor) is a key component of the disc braking system. It rotates with the wheel and is clamped by the brake pads through the brake caliper when the brake pedal is pressed. The resulting friction converts kinetic energy into heat, slowing down or stopping the vehicle efficiently. High-quality discs ensure stable braking, heat dissipation, and long-lasting performance.
There are several types, each designed for specific driving conditions:
Solid Discs: Standard design, used in front or rear of smaller vehicles.
Vented Discs: Feature internal cooling channels for better heat dissipation.
Drilled or Slotted Discs: Provide improved cooling, cleaning, and wet-weather performance (ideal for performance or heavy-duty use).
Always match the type to your vehicle’s original specifications.
Common symptoms include:
Vibration or pulsation in the brake pedal or steering wheel when braking
Squealing or grinding noise
Blue discoloration or scoring marks on the disc surface
Reduced braking efficiency or longer stopping distance
Uneven pad wear or grooved surface
If any signs appear, have your discs inspected and measured — replacement is usually required if disc thickness is below the minimum limit.
To ensure compatibility, confirm the following details:
OEM or Part Number
Vehicle make, model, year, and engine size
Axle position (front or rear)
Disc dimensions (diameter, thickness, height, center bore)
Type: solid, vented, drilled, or slotted
If you’re unsure, share your VIN or chassis number with us — our team will verify the correct fitment.
Yes, it’s highly recommended to replace brake pads along with brake discs. Old pads can cause uneven wear or reduced friction on new discs. Replacing both ensures optimal braking performance, smooth bedding-in, and longer component lifespan. Always perform proper run-in (bedding) procedure after installation.
Yes. Our brake discs are manufactured to OEM standards using high-carbon or cast-iron materials for maximum strength and thermal stability. Each disc undergoes balancing, hardness, and runout testing to ensure vibration-free and consistent braking. All discs come with a manufacturer’s warranty and are suitable for professional workshop installation.
Brake Disc
Partxl proudly delivers the most extensive range of Bosch automotive products across the GCC region. As a trusted supplier for garages, wholesalers, and car enthusiasts, we stock both original equipment (OE) and high-quality aftermarket Bosch parts to meet all your vehicle maintenance and repair needs. Whether you're looking for Bosch fuel injectors, sensors, spark plugs, filters, braking systems, alternators, or diagnostic tools, Partxl has you covered with one of the widest selections available.
Thanks to our central warehouse located in Al Quoz 3, Dubai, and a strong network of suppliers, we ensure fast, reliable delivery—same-day or next-day across the UAE and within 3 days to the wider GCC. Our clients benefit from a seamless shopping experience, advanced part search options by VIN, engine code, or OEM number, and expert support to find the perfect fit for any vehicle. Whether you're servicing European, Asian, or American vehicles, trust Partxl to deliver Bosch quality with speed and precision.
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