I have a YBR which I bought last year and it developed a problem. When it encounters a bump while steering sideways (both sides)and actuating the front brake even slightly,the steering starts whobling (sometimes dangerously) until I release the brake lever. Visually it seems everything OK: tyre pressure as recomended,brake pads uniform, disk brake not damaged and there is no steering free play. Does anyone encountered such a problem? Can anyone help me please? Thanks