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the brakes have not been set properly. may be something stopping the pistons going back in. failing that the disc's are bent, can happen when over braking down hills etc. you would need the alinement checking.
The problem is the clutch and the engine flywheel are heat damaged, this is called clutch "chatter" You must have the entire clutch replaced and the flywheel machined smooth again. The damage is caused by excessive slipping of the clutch on take off. Release the clutch asap when you start off, do not slip it for long periods this turns it nearly read hot.
The disks may be warped, which will cause a vibration under braking. Also if it's an ABS system, the vibration is normal but only under heavy braking, and should not continue to vibrate when working properly.