sound through brake

did a 4 ch amp in a 2002 pontiac firebird and now cust states when he applies the brake he can hear it through the system.  I have checked grounds and looked to see if rca's are getting pinched but everything looks good.  Any help will be greatly appreciated.

"...he can hear it through the system". Hear WHAT? Pops? Clicks? Staic? Whine? We need a FAR better description of what he is hearing.

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

sorry it pops through the speakers

OH I thought you were saying you had sound coming out of the brakes.  I was going to say let's patent that innovation!!

Did you create a new clean ground point for the amp?

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what kind of deck? pioneer maybe??

no it's a kenwood double din. 

I guess before changing the ground on the amp, I would first go through the RCA's one at a time. First listen to all the speakers one at a time. See if the noise is coming from them all. If the sound is not coming through all 4 speakers, then its not a ground problem, but rather a RCA problem. Then simply start unplugging each RCA at the amp one at a time just to narrow it down to which which speaker/RCA is the problem. Another thing that could be a problem is where the RCA's or speaker wires are in comparision to the brake pedal and so on. It could be that either  the RCA(s) or speaker wire(s) are too close to something dealing with the brake and when the pedal is pushed in, the sound bleeds into the wire that is close by. If there is this sound from all 4 speakers, then I would start with the ground. Another thing... I always thought that if it was a bad ground, then you would have a ground loop problem. If there is a noise from the brakes but not a ground loop problem, then how could it be a bad ground?

yeah i was thinking about taking a set of rca's and running them on the outside of the car and see if it goes away.  If it does then i know something with the rca's, if not then i know to go somewhere else.  The cust was supposed to be here about 1 hour ago and still hasn't showed up so i guess it's not that important to him.

Find out if the noise only occurs with AM or FM. Try other accessories in the car to see if they too make noise. Use any swtich that passes a good source of current (wipers, horn, signals). If it does, I would suspect a fault in the antenna. Check that the antenna lead adaptor is the correct one and allows a good ground for the antenna to radio. If the noise is present on all sources, you can use capacitors across the brake switch to eliminate the noise. Three small polarized caps should do the job. One across the hot and switched wires, one from the hot side to ground and one from switched to ground. This should take car of it. The brake switch could also be replaced. You are likely hearing the arcing of the switch contacts. After a few years the contacts build up a lot of carbon and create noise.

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sparky

The customer finally showed up and looked at the ground on the battery and it was extremely loose.  So I got that nice and tight and now the pop can only be heard through the rear speakers only if the radio is all the way down and you don't rev the engine.  It has to be complety quite to hear it.

So the popping only happens when the engine is reving and the brake pedal is pushed in?

sparkie wrote:

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Try other accessories in the car to see if they too make noise. Use any swtich that passes a good source of current (wipers, horn, signals)

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Yeah, honk the horn and see if you hear the noise... J/K

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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
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