B2006

Mercedes benz E350 (2005). The brake system was always malfunction, it has happened 4 times in a week, my car was took longer distance to completed stop, and also display a message of ' reduced braking power depress brake pedal fully'. So that i took my car to mercedes benz dealer to check, the service advisor gave me the answer was need to replace the part number of 005-431-81-12, after that i went home and check on internet and found out that mercedes benz have a recall (recall number 2004050014 & 2005070007) for this kind of brake issues, and then i took my car back to the dealer for checking one more time, now they are giving me another story, they said nothing wrong with the part listed above, but still need to replace another part (part number is 000-430-0712). According to the operator's manual, e-glass sedan, usa edition B2006, page 400, it has mentioned that when the message display on screen of reduced braking power depress brake pedal fully', that means is the electrohydraulic brake system is in emergency operation mode. Considerably greater brake pedal force is required and the stopping distance is increased. I deeply believe that the brake problem must related to those two recall. But the mercedes benz was refused to repair as no cost. Please advise me that what should i do, shall i bring my car to our mercedes benz dealer.
SERVICE BRAKES, HYDRAULIC,