Service life Brakes SLK 55 AMG

Hello, stand (after a long search) close to buying a SLK 55 AMG. Vehicle is year 11/2006..3. Hand…142,000 km mileage…and is completely checkbook maintained. Price is at VB 21.500 €….. Seller said he had the brakes (combined brake discs incl. pads) changed at KM 85,000, but those still in a very good condition due to his “decent” driving (vehicle was allegedly driven the last 10,000 km with a cut-through consumption of 10.7 l) are….so as to wear. Now my question in the round….can you say about what service life such a braking system has? Of course I know that it depends on the respective driving style and which routes you drive mainly (road, highway ect.) ,but there should still be about a value,or? Somewhere I’ve read that it would be about 80,000 km,unfortunately I don’t find this report any more. In addition, a transmission flush has never been advanced in the vehicle before. ommen….would it make sense to make up for this after purchase? Hope that I may get some answers to my questions. Thank you very much in advance.