Hello.. I am wondering how difficult it would be to replace the front brake pads on a 92 500SL//

how involved is it??
do i have to replace the sensor along with the pad ?? or just the pad??

thanks guys..

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Turk..
00 S500 W220
93 300SE W140
01 C 240 W203
86 SVO Mustang (Turbo Pwr'd.. hehe)