Radio volume going down when braking

guardo

New Member
Croatia
Few days ago I was driving to work when suddenly I noticed that my radio volume is lowering when I'm pressing my brake pedal. It is only happening when my lights are turned on. While my lights are turned off and I'm pressing my braking pedal the radio volume is not lowering itself. Radio is aftermarket unit (Sony). Radio is not showing that I am lowering my volume, and when I stop pressing the braking pedal the volume is normal again.
I checked my lights and all lights and blinkers are working fine, also checked battery and alternator and they are also fine.
Does anyone have idea what could be causing that?
Thanks!
 
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