ddcha

iTrader: (4)

This is the second day in a row it's happened. Backing out of my driveway, I noticed a pretty loud noise when I brake, going in reverse only. The sound is like a "yawn", sounds kinda like when a big bus is braking, or like a chewbaka yelp. NOT a high-pitched screeching or squealing sound. When I resume driving forward, the brakes make zero noise. This happens only in reverse. Any ideas or advice? Much appreciated.

ddcha

iTrader: (4)

bump

Myszkewicz

iTrader: (2)

If it only happens the first time you back up that day, it's just the thin layer of rust that forms on the rear discs. Nothing to worry about.

ddcha

iTrader: (4)

I don't get it going forward though. Does this mean that the rear brakes aren't being utilized when I'm going forward??

otter

iTrader: (14)

It's normal. Yes, your rear brakes are used in both forward and reverse. The noise is just one of those weird things. There may be a more scientific reason for it, but I don't know it.

ddcha

iTrader: (4)

I never had the same problem with my 05. And the noise is a bit too loud to be considered "normal" I think. I guess I'll have to get my brakes checked out.

mattjkim

i have the same problem, a loud groan type sound everytime i back out of the house in the morning.

caligula

iTrader: (3)

^^^ +1

captain150

The noise only happens in reverse likely because of the angle of the pads or that they are worn in from forward stopping. Dunno if you have ever done this, but if you ever rub your finger on wet glass, it sometimes/usually only makes noise in one direction. Same deal, in reverse, the pads "catch" or chatter (or groan etc) on the rust and make the noise. If you could slow it down and magnify it, the pad would be jumping up and down off the brake disk a tiny bit, very quickly. This doesn't happen in forward because the pads don't catch or chatter over the rust.
Something I don't know though is why this happens to almost all RAs and hardly any other cars. It's again probably how the pad sits against the disc.

4G93Turbo

iTrader: (2)

I assume you checked the thickness of the pads and the brake pad wear indicators are not rubbing.....? If so, then capitan150's explanation seems very logical...

ddcha

iTrader: (4)

this is correct. this is not the same sound as wear indicators.

ddcha

iTrader: (4)

I heard that the "brake disc quiet" sprays they sell at auto stores are a decent fix (not permanent though). Anyone here try this and recommend a brand? You basically take off the calipers and spray them I think.

Myszkewicz

iTrader: (2)

Never tried the spray, had decent results with the thick goop you smear on the back of the pads, though. It eventually washes out or squeezes out or something, but it works for a while.

byc_panty

iTrader: (2)

I posted a similar thread this week....

someone said its just rust built up and thas all....

ddcha

iTrader: (4)

wow. you have this same problem on your 06 already??? I never had the issue on my 05... although it had less than 8k miles on it. My car now has 23k