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Car Forum / Mercedes-Benz Cars / August 20072003 E500 BRAKES
2003 E500 brake by wire. Do the rent and rear brake pads wear the same? Without brake by wire the front pads usually needs replacing before the rear pads. Law of physic still applies... front wears faster. The reason is front brakes does 75 to 80% of the job. My first repair the dealer replaced the front and rear pads at the same time. Does the SBC by the distribution of power apply more pressure to the rear pads causing them to wear the same as the front pads? > Law of physic still applies... front wears faster. The reason is front > brakes does 75 to 80% of the job. I think the dealer did you a great service... by doing both at the same time, they eliminate you needing to come in the second time for the rear. There is a reason why front brake rotors are massive compared to the back... because the front does all the work. When under ABS and ETS, they will grab whichever wheel they deem necessary with more force to keep the car under control... but this mode is used only when you need it so it is very minor wear to the rear pads. > My first repair the dealer replaced the front and rear pads at the same > time. Does the SBC by the distribution of power apply more pressure > to the rear pads causing them to wear the same as the front pads? No, as Tiger pointed out, the laws of physics still apply. When going down the road forwards and stepping on the brake, the weight of the car is transferred to the front axle. This means the front brakes do the majority of the work and hence wear faster. If the pressure applied to the rear was equal as you suggested, the rear brakes would lock up, which isn't desirable. Marty
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