I have a -06 Golf IV Variant and in one day it lit some warning lights to my instrument cluster.
EPC and Engine warning light lit and cruise control not working. Naturally I fired Google up and found that broken brake pedal switch can cause all of those problems. Running Ross Tech’s VCDS’s Measuring Values for cruise control confirmed the case. As one may know, cruise control needs to know when brake pedal is pressed that you don’t fight the engine. In the link provided is info how to check (with appropriate cable and downloaded VCDS-software) if the brake pedal switch is faulty or not. When I checked mine, it turned out that one of the two switches inside that brake pedal switch did not work. So I went to a local dealer and bought a new one for 20€. After fitting that in place I cleared all the DTC’s with VCDS and measured values again. All passed!
Some pictures of the process.
Here is the old one in position.
To remove it, it has to be twisted counter clockwise a bit.
Then it can be removed.
A new one.
VCDS: No braking.
Braking. When braking, last two digits in Bin Bits-section must be 1, as they are now.