I'm sure this has been covered, but I can't find it with search. In checking out a 124 - 300e I get a pulse when braking that would normally make me think I've got a disk that needs replacing or maybe a grabby caliper. I'm told it's just the ABS. Well fine but there must be a problem with a sensor.
Do they go out ferquently or just need to be cleaned? Can I just unplug one side and test the brakes or will I mess something up if I do? Can I unplug one side and then the other or must it be both at once?

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89 300E
79 240D
72 Westy
63 Bug sunroof
85 Jeep CJ7
86 Chevy 6.2l diesel PU

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