normal parking brake behavior? - Chevy Impala Forums
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post #1 of (permalink) Old 03-19-2019 Thread Starter
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normal parking brake behavior?

came back from an 8 day trip and upon trying to leave. saw the parking brakes were stuck on. 2nd tap of the accelerator freed me but wonder if something is amiss or should i try not to put the brake on when i'm gone for a week?

i did new rotors and pads last year however i still do notice the occasional rear 'overnight rust' noise on them which i thought would go away with new hardware.

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kick the parking break on and off a few times to see if it does it again. maybe they just rusted to the rotors. rotors are so cheap anymore they rust within hours of it raining. i'm not sure if you can lube the e brake cable on these or not.

when i release the parking break i let it slam back to the top if i can so i know it fully released. after 173k miles on my 2010 it was still functioning perfectly. i used it once a month or more on average.
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i never thought to try the switch again. ill try to remember

then for a while afterword there was a heavy 'wub wub' type noise which i guess was the chunk of rust being slowly rubbed down till it was smooth.

it was a level lot at the airport so i guess i really didnt need the brake. i never use it in my garage but i always use it everywhere else

i have this fear of straining the trans..founded or not..hard to get rid of lifetime habit

i remember when i was a kid, in my grandmothers 67 impala she parked on a hill and couldnt get it out of gear because didnt use the parking brake.

i inherited that 6 cyl beast as my 1st car. loved it and the vent windows and vent on the floor

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post #4 of (permalink) Old 03-19-2019
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on flat ground you shouldn't need it, but i feel using it if it is in working condition does keep it working longer. the noise you heard afterwards as you stated was probably the rust rubbing the pads for a couple of stops until it wore off again. i've experienced similar noises i believe after a couple of real damp days that built surface rust.
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Rare we ever use the parking brake, only times would be parking on a hill, when I lift the car with a jack, or pull up on ramps. Never had any issues with it. At just under 160,000 miles the back rotors on our car have been turned just once and still look great, never sits long enough to see any rust on the rotors.

My 6 year constantly asks why. What adults can learn from 5 and 6 year olds, to listen with your ears and mind open. Hard to learn when you don't listen ......
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Originally Posted by 12 lt View Post
Rare we ever use the parking brake, only times would be parking on a hill, when I lift the car with a jack, or pull up on ramps. Never had any issues with it. At just under 160,000 miles the back rotors on our car have been turned just once and still look great, never sits long enough to see any rust on the rotors.
sadly i only drive it 3 hours a day and its sitting from 530pm to 630 am till i drive it again so those 13 hours are very rusty in my garage i guess maybe i should get up around midnight and drive it to prevent the rust..is really weird. i had thought 700 miles a week is a lotta driving vs what others do but apparently not. i so i suffer with the noise every morning since ive failed to keep the brakes warm enough. maybe they have heaters like for engine blocks

i wonder why the rears only do it, not the fronts. arent they they same material?

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Quote:
Originally Posted by luckydriver View Post
sadly i only drive it 3 hours a day and its sitting from 530pm to 630 am till i drive it again so those 13 hours are very rusty in my garage i guess maybe i should get up around midnight and drive it to prevent the rust..is really weird. i had thought 700 miles a week is a lotta driving vs what others do but apparently not. i so i suffer with the noise every morning since ive failed to keep the brakes warm enough. maybe they have heaters like for engine blocks

i wonder why the rears only do it, not the fronts. arent they they same material?
Dunno, still on the original rotors on our car, and we do not get salted roads too often. Guessing in PA that you see a lot of salt exposure. Are you on the original rotors, or did you have them changed, change them yourself? If you changed the rotors, did you use the same for the front as you did the back?

My 6 year constantly asks why. What adults can learn from 5 and 6 year olds, to listen with your ears and mind open. Hard to learn when you don't listen ......
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Quote:
Originally Posted by luckydriver View Post
i did new rotors and pads last year however i still do notice the occasional rear 'overnight rust' noise on them which i thought would go away with new hardware.
I'm wondering if you are actually hearing the ABS fire, or more likely the traction control (applying the brake).

My 2013 was applying the right front brake, usually when I was pulling out of the driveway or a parking space, and had cut the wheel all the way. I fiddled with the speed sensor connector on that side and it's mostly gone away. To be clear, I did not find any sign of a broken wire which we saw on earlier Impalas that was causing the ABS to kick in.

The traction control firing sound has a much higher repetition rate than the ABS, and sounds a lot like grinding. Also, I could feel it in the steering - when the brake was being applied, it would pull the wheel a tiny bit.

Also, when mine would engage, I don't recall ever seeing anything light up on the instrument cluster.

If you are actually hearing the rears rather than the fronts, it's obviously not due to steering. Not sure what could be affecting the rears.

But on mine, when I jacked it up and removed the wheel, I could see, when the steering wheel was turned, the wire going to the speed sensor on the right front was getting flexed a tiny bit, and I inferred that flexing was affecting the signal thru the connector at the rotor. My take was that the contacts in the connector weren't making a good connection and that was causing extra pulses to be seen by the computer which would interpret them as wheel spin which in turn caused it to apply the brake.

I extracted and inserted the connector several times to clean the contacts, and then made sure it was fully seated when I plugged it back in. The problem went away. I think I recently heard it fire for the first time in months, but it happened so fast, I'm not sure what it was. My son's been driving it since, and he hasn't made any comments about it.

Anyway, if you're hearing a grinding noise occasionally, it may not be rotor rust

Doug

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_

If your socket set is all the same brand, you might be a city slicker.

.
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post #9 of (permalink) Old 04-08-2019 Thread Starter
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i have more info and unsure what to do with it

sunday morning i drove the car after it sitting since friday nite. i NEVER put the parking brake on in the garage. yet this time when i pulled out of the garage, it was like the PB was on and the car had to break free and it lurched forward. this was accompanied by the daily grinding i hear every day out of the rears.

of course that grinding goes away after a few pedals.

today i only had the grinding noise when i pulled out.

maybe something is hanging up and this is why i can only drive 2 days instead of 3 before having to fill up? i thought it was because the colder weather that i got bad mileage but now i'm not so sure.

i just put all new ACD stuff on last year on the rears, hate to take it apart but what can i do about this? actually i take it back. i had bought the wrong pins and so had to put the old ones back in. couldnt get out to get the right ones.

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166K on 2014 Blue Ray Metallic 2LTZ with 19s and nav. sadly new trans at 140K. Used to own 1995 DCM SS with only 260K!
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Easy way to determine "brake drag" is after a short drive, touch the center of all wheels checking for 1 or more abnormally warm/hot. If so, you've found your culprit(s).
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It's automatic

I *never* use the parking brake. It's electric, and I was stunned that there was a firmware update specifically for the parking brake in an early recall (a bug preventing the system from completely releasing the brake under some conditions).

Despite my never deliberately engaging the parking brake, I did notice that the car occasionally activates it on its own. You get in to drive away, and you feel that the wheels are locked - and you hear the whirring noise of the brakes being released. This was a big "WTF?" when I first had it happen. Then I checked the manual:

"The vehicle may automatically apply the EPB in some situations when the vehicle is not moving. This is normal, and is done to periodically check the correct operation of the EPB system."

I have a 2014 2LTZ and it's probably done this automatic brake application a dozen times (that I've noticed) in the time I've had it.
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so who fixed it? past 2 days no grinding and i'm near 26 mpg and am on my 3rd day not filling my tank. what would hotter weather have to do with brakes not grinding and better gas mileage.

who can solve the mystery.

2 RSA for sale. 7/32 good tread. berks county PA

166K on 2014 Blue Ray Metallic 2LTZ with 19s and nav. sadly new trans at 140K. Used to own 1995 DCM SS with only 260K!
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Quote:
Originally Posted by luckydriver View Post
so who fixed it? past 2 days no grinding and i'm near 26 mpg and am on my 3rd day not filling my tank. what would hotter weather have to do with brakes not grinding and better gas mileage.



who can solve the mystery.
Your car just hates winter. Like me lol

2013 LT
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Originally Posted by luckydriver View Post
so who fixed it?

who can solve the mystery.
What I was attempting to say is that the occasional automatic application (without your intervention) is normal. But the dragging isn't.

Question: You, too, have a 2014. Did you get the firmware fix for the parking brake? Re-reading the bulletin, it doesn't look like the update actually corrects the issue of a dragging parking brake - but it does correct the issue of the car not telling you. The indicator goes out, making you think that the parking brake is fully released - but it isn't.

Link here: https://static.nhtsa.gov/odi/rcl/201...4V541-6664.pdf

Cheers!
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yes there are no outstanding recalls on the car. plus i get if the brakes drag after i would have the PB on. but why would they drag after the car sits with NO PB on and grind so bad. and why would the grinding go away when you drive. and why woudnt it come back after i spent 1 hour in the grocery store and then drive away (i used to always put PB on at the stores before). id expect it to do that every store i stopped and put the brake on. but the grinding is only in the mornings.

grinding has something to do with the car sitting overnight for sure.

when came back a week after being out of state. that was an insane clunk i heard! thought rear axle fell off. so i think its actually maybe 2 issues here. grinding and the clunk

2 RSA for sale. 7/32 good tread. berks county PA

166K on 2014 Blue Ray Metallic 2LTZ with 19s and nav. sadly new trans at 140K. Used to own 1995 DCM SS with only 260K!
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