[Paul]

rub finger on what ever is leaking if it is rear axle oil it has a smell that you will not mistake for anything else.
I do not think anything leaking on rotor would cause a pulsation in braking
rotor itself could be warped (replace rotor)
or like the other person mentioned it could be abs sensor activating which causes a pumping the brake motion (pulsation)

I hope this helps you out a little

[Author]

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