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Strange occurrence when applying brakes in reverse.

S

scheuvront1993

New member
Hi all, I was hoping for a little help here, as I am pretty dumbfounded by this. Let me start by saying that my brakes work flawlessly with no issues, other than the ABS light occasionally coming on. That being said, when I put my car in reverse and use my brakes there is a terrible grinding sound. It fells like something is trying to catch on the wheel or something, like the caliper is locking up. I just don't understand why it would only do it in reverse? Any help would be awesome. Car is 2000 Grand Prix, stock brakes.
 


its the abs self test, it will do it in forward too. you just seem to only start it and leave in reverse. its normal.
 
I actually back down into my driveway, so when I leave my house I pull out. There are multiple other instances where I pull out and not back out. It does not and has never done it in drive. It only occurs in reverse
 
they all do it, its normal.

get your abs scanned, fix that issue.

what happens is your now listening and feeling for stuff, well you found it, but its done it for years.

ride the brake pedal as you pull off, you'll feel it do the self test.


what year is your car? 97/98 seem to do it much louder. some times its silent in my car, but i feel/hear it 99% of the time. as well as many others.
 
if the abs problem is related to a wheel bearing going out that could be the rust on the rotor edges hitting the dust shields/etc in revers with the excessive bearing play.
caliper bolt/pin fell the **** off/out.
parking brake shoe /hardware came apart.

motor mount died and your DP is now vibrating the floor
 


Checked the caliper mounting bolts yet? If the bottom one fell out, the brakes will feel normal in drive but in reverse the caliper is trying to rotate out and the only thing stopping it is the rim.
 
Scottybdoggs, im not trying to insult you but if you drove my car you would know, that is not the problem. Industrialfish what you said makes sense. It feels like the caliper on the driver side front is trying to lock up. Again it does not and has never done it in drive. My car is 2000 by the way. I've only owned the car going on 4 months and it has never done it up until the last couple of weeks it is not my imagination. It is not the self test. It literally feels like something is broken. The grinding is so loud my wifes grandfather heard it from his house when i was backing unto my driveway.
 
if its that loud by all means break out the jack and get the wheel off and start looking for a missing bolt or some thing.

now it only makes this sound when the car is just started up, then backed out the drive way and does it one time only. id still think its the abs self test.
 
No it does it all they time. No matter how many times per day I back it up, it does it. I should've specified that. I will diagnose soon. I've just been to lazy to pull the wheel off. So I will of course be looking into it shortly
 
that sounds more like a missing caliper bracket bolt then. the sound you hear when a bolt is missing is the caliper hitting the wheel. you'll see some marks on the caliper and wheel pretty fast.
 


Just look through the rim at the inside of the wheel. It'll be obvious is a caliper bolt fell out by the gouge inside the wheel.
 
Hi all, I took the wheel off a little bit ago and it seems like ScottyBDoggs hit the nail right on the head. Missing caliper bracket bolt. So I will be purchasing asap and fixing the problem. It seems my wheel has also suffered a rather large gash... oh well I plan to put a different set on sometime.
 


ScottyBDoggs said:
id love to know how those fall out. not the first time we've seen that happen here.
Click to expand...

corrosion builds up around the bracket to knuckle ear holes (yay! dissimilar metal corrosion!) when reinstalling most people will crank one bolt down then hit the other, if the ear is out of place and you clamp it on the ridge of corrosion...guess what loosens up when the corrosion crumbles and the bolt no longer provides enough tension to keep it from moving. try not to remove the black zinc/chromate on the caliper bracket but at least run a razor blade over the knuckle and bracket ears to get rid of the corrosion without removing the protective coating (well any more than you have to...)
 
i just ape em on always, never had one even be loose, never mind fall out. and i only use habd tools/ it it tool a pipe on the breaker bar to get off, thats how it goes back on, with a pipe.
 
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