pedal vibrates when brakes are applied, '91 Imperial

[tayl0124]

When I press on the break pedal, stopped or while moving, there is a buzzing sound and the pedal vibrates. Does anyone know what is causing this?

[srdjs1]

If the car has ABS it may be in relation to that.

[tayl0124]

This happens almost every time I press on the break. I don't believe it is an abs type of sound.

[wisemank]

I have the same issue. This is the ABS module. Not sure why or what, but it is common.