Help with Mercedes W211 E220 CDI Brake fault

[sdtsedat]

Hi everyone,

I have a problem with customer car. DTC read with diagnostic tool = C26BB.
I search on google and found SBC brake pump and will cost 1500 euros.

I reset the DTC and car goes very well ( no fault and brakes will working)

Anyone any idea? Is this a sensor (under the brake pedal) or pump damaged?

Thanks!

[mercis]

if you can error code erase,and sbc work,all ok

[sdtsedat]

What can i do for erase error code?
DTC delete with diagnostic tool don't work.

Can we delete in file (read with kess) ?

[mercis]

avdi fvdi,read and repair dump