I have a 2006 mercedes benz E350 changed brake pads and now I have no brakes.

This is a dealer only job iam afraid as they have to use special software to retract the calipers and as the pistons would not go back in iam assuming you undone the bleed nipples to get the pistons to go back in .Last time i done one of these i had the same problem but it was a newer model then a warning light came on so connected my code reader and the immobilisor came on as unauthorised access to the OBDII ,ended up in mercedes garage and the owner got a bill for 789 euros as it was mercedes spec to renew the disks as well as the pads every time they wear down ,and when i took owner to collect vehicle the new pads i fitted were not returned -- their was some snooty receptionist saying it wouldnt start because of illegal access to the OBDII ,i walked away before i hit him -- evidently the brake pad box has a bar code which has to be read with the light whilst vehicle is connected to the internet to confirm that they are genuine pads before the ABS and immobilisor is released by the factoy computer .About time i retired to a classic vehicle workshop