Hi new to this so apologise if I get things wrong. Got a2001 E320 AVANTGARDE ESTATE which I have had a year and am pleased with. Warning lights have come on for ABS BAS AND ESP. Been told by a mate that a brake light switch about 12 pounds and ten minute job is prob. all I need . Sounds too good to be true , Merc garage want over £100 just to run diagnostics. Any previous !? feedback please Thanks