Test drive in Z 4 is not possible !!!!

Hello, today my dealer called for brake fluid change. Date stands … Saturday at 9.30. To my question,if I could test the Z 4 he said : goes not, have not registered !!! Bums from end !!!!!! Pulse down to 4 beats per minute….. Test drive ade….Stay in the workshop now. Is it at the dealer ???? ( 2 car houses ) He does not need 10 pieces on the yard. But no, that can not be or ??? Ps : then I stay with him. me in small