Key learning for the Infra- Red (IR) Mercedes keys. Reading EZS (EIS) Configuration data dump by IR connector or by OBD (Please note that the password is not read and needs to be acquired by reading the NEC MCU of a working key). Once the Dump is read (either by OBD, IR or programmer) and the password is obtained the calculation can be performed online with the Abrites servers in order to generate key dumps or it can be performed offline using the Abrites PROTAG programmer which needs to be connected to the computer and the Abrites diagnostics for Mercedes/Maybach/Smart. The calculated key dumps can be written onto IR keys (Original or Abrites IR keys) using the PROTAG programmer's IR port or using an ABPROG V4 PCB to which the NEC MCU needs to be soldered.
Finally the last method requires a helper. The helper
will pump on the brake system and finally hold it down to generate the
necessary brake system pressure. While they are pushing the pedal to the
floor you open one of the bleeder screws. Fluid and air will come out and
the brake pedal will sink to the floor. When the brake pedal hits the floor
have them hold it there until you close the bleeder screw. Have your helper
release the brake pedal and pump the pedal up 2 to 3 times again. Open the
bleeder screw again and repeat this step at the same brake caliper several
times until the brake fluid runs clear and is free of air bubbles. Mercedes
Benz recommends you start at the right side rear wheel, followed by the left
side rear wheel, followed by the right side front wheel and finally the left
side front wheel. Make sure the brake fluid reservoir is topped off each
time you switch to bleed a different wheel.
Mercedes Benz recommends you exchange your brake fluid every two years.
In order to bleed the brakes you should lift and support your vehicle. It will be more difficult on the ground where you have to reach behind the wheels while you open and close the brake caliper bleeder screw. It is possible but makes the job more difficult.
Your SBC pump is defective and you loose all the braking or have reduced braking power. The SBC pump which creates pressure and applies that pressure to the brakes when you push the brake pedal is not working properly. This error is common issue on Mercedes E Class W211, SL R230, CLS Class with SBC Error CODE C249F. After so many operation cycles the SBC looses efficiency or can completely fail while driving. So that you don’t get a failure while driving they want you to replace the SBC Hydraulic Unit before it fails catastrophically.