My VP has VT front brakes with slotted rotors and VT master and booster. Upgrade has been in the car for a few years. In the last few days I have experienced a disturbing strong vibration or shudder for a second or 2 when accelerating after releasing the brake pedal. This has happened 3 times. It feels like it is shaking the whole car and then stops. I am interpreting it as a brake problem. Front of car is currently lifted and wheels off. Rotating the front wheels it is clear that the driver's side wheel is dragging and feels worse on some areas of the rotation. I have been experiencing some vibration under braking recently and the whirring from the (straight) slotted rotors has seemed to be getting more noticeable. Stopping power has still been good but all 4 rotors were hot after a relatively short drive yesterday. I'm pretty sure I've got free play in the push rod but that's an obvious candidate. Any tips on how to proceed?