Strange minor stereo issue?

Question

I have a system 2 subs 2 amps eq and deck. Now even when i had stock deck this issue was there. If my radio volume down and i press my brake petal i here a snap in the speaker it makes a snap very quiet so when volume up never notice. But what could it be my ground wire seems really secure and its 0 gauge screwed in to metal in the trunk side like frame.

Answer 1

I would start by moving the EQ and Deck ground leads to metal, not to a factory harness, if they are not already.

Answer 2

It might be a loose connection where the amp kit is installed. If the amp 12 volt wire is drilled through your fire wall next to your brake pedal, this could be it.

It's a very small issue, take it to a pro install shop or look at it yourself. If you notice extra slack or too tight of slack of the amp kit next to your brake, take a wire tie and tie it down to a s***w or  another clip next to your floorboard.

Best of Luck