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On average, the cost for a Mercedes-Benz R550 ABS Speed Sensor Replacement is $257 with $162 for parts and $95 for labor. Prices may vary depending on your location.
| Car | Service | Estimate | Shop/Dealer Price |
|---|---|---|---|
| 2008 Mercedes-Benz R550V8-5.5L | Service typeABS Speed Sensor - Driver Side Front Replacement | Estimate$479.47 | Shop/Dealer Price$588.09 - $874.58 |
| 2008 Mercedes-Benz R550V8-5.5L | Service typeABS Speed Sensor - Driver Side Rear Replacement | Estimate$438.03 | Shop/Dealer Price$541.32 - $811.75 |
| 2008 Mercedes-Benz R550V8-5.5L | Service typeABS Speed Sensor - Passenger Side Rear Replacement | Estimate$418.55 | Shop/Dealer Price$516.97 - $772.79 |
| 2008 Mercedes-Benz R550V8-5.5L | Service typeABS Speed Sensor - Passenger Side Front Replacement | Estimate$459.47 | Shop/Dealer Price$568.08 - $854.56 |
Most modern vehicles have antiÂ-lock brake systems that use sensors to detect wheel rotation rates, reporting to a computer that is able to modulate brake pressure if one or more wheels should lock during a braking operation. Usually the sensor is a HallÂeffect, or so-Âcalled reluctance component, which looks at a toothed ring (called a tone ring) that is affixed to the wheel or axle. The teeth passing by the sensor creates a wave form that can be recognized and interpreted by the ABS controller. On three-channel ABS systems (typically found on older pickups), the rear axle is monitored by one sensor while the front wheels have their own individual sensors and antiÂ-lock control. Four-channel systems monitor each wheel independently.
If one or more ABS speed sensors fail, the entire system defaults to a non-Âoperational status, providing no antiÂ-lock control. The diagnostic system will reveal to the mechanic which sensors (if more than one) have failed.
If a sensor fails, the ABS warning light will illuminate every time you start the car, and stay lit.
If you lose ABS intervention, you may lock up the brakes in an emergency, increasing stopping distance and losing all steering ability.
Have a mechanic inspect the vehicle's brake system and replace any wheel speed sensors that are defective. The difference between a vehicle with and without operational ABS is potentially a matter of life and death. Your brakes will still operate, but the chances of a lockup on slippery surfaces or in an emergency – without ABS – are pretty much 100 percent.
Functional ABS is the difference between being able to simultaneously brake and steer past an obstacle, or locking up and hitting it. It's considered important enough for insurance companies to offer discounts to owners of cars equipped with ABS systems. With a failed speed sensor, you're driving around with sophisticated electronic control systems, relays and sensors that could save your life. If only they worked.
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