Parking brake - Chevy Impala SS Forum
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post #1 of 10 (permalink) Old 03-19-2017, 12:22 PM Thread Starter
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Parking brake

SHould the parking brake be able to fully stop the car?

I'm haveing an issue with the brakes pulsing (I'm pretty sure it's the front rotors need to be turned/replaced) and to check weather it was coming from the front rotors or rear drums I used the parking brake to stop. No pulsing from the rear but the parking brake didn't stop the car.

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post #2 of 10 (permalink) Old 03-19-2017, 02:47 PM
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SHould the parking brake be able to fully stop the car?
I blew a front hose on the interstate with the Cady pulling an 8' trailer, and with tame speed, downshifting and intense eye on upcoming was able to make it the 20 minutes back home. So, yes it is able. That said, I believe you're only pulling on one shoe and not even 10% as effective as fully working 4 corners.

Just a thought but not stopping well may just be a matter of adjusting the drums out so you don't run out of cable.

BTW and FWIW, I found the confusing cause of increasingly bad pulsing-squeaking-skidding on my new Cady, which had had new brakes done just before I bought it. The seller's preferred service shop apparently followed the "10-15 pumps of grease per zirk" rule, and both ball joint boots were split in 1/2 - spilling right onto the rotors.

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post #3 of 10 (permalink) Old 03-19-2017, 03:51 PM
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Quote:
Originally Posted by Mattb View Post
SHould the parking brake be able to fully stop the car?

I'm haveing an issue with the brakes pulsing (I'm pretty sure it's the front rotors need to be turned/replaced) and to check weather it was coming from the front rotors or rear drums I used the parking brake to stop. No pulsing from the rear but the parking brake didn't stop the car.
To first answer your question, YES the parking brake should be able to stop your car but not anywhere as quickly as the service brakes will obviously.

The way you were trying to test for brake pulsation to eliminate either the front or rear brakes as being the cause was a good idea EXCEPT that our cars use a small drum brake inside the "hat" of the rear rotors and therefore won't help your diagnosis at all on our cars.

1996 DGGM Impala SS
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post #4 of 10 (permalink) Old 03-19-2017, 08:49 PM Thread Starter
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Originally Posted by 4x4high View Post
To first answer your question, YES the parking brake should be able to stop your car but not anywhere as quickly as the service brakes will obviously.

The way you were trying to test for brake pulsation to eliminate either the front or rear brakes as being the cause was a good idea EXCEPT that our cars use a small drum brake inside the "hat" of the rear rotors and therefore won't help your diagnosis at all on our cars.
Hmm. That's good to know. I still think it's the front but I'll figure out a different way to know for sure before I start buying parts. Thanks for that!

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post #5 of 10 (permalink) Old 03-19-2017, 09:58 PM
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Originally Posted by 4x4high
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EXCEPT that our cars use a small drum brake inside the "hat" of the rear rotors
Correct for a Impala.

But if you look at Mattb's signature:
1996 Buick Roadmaster Wagon, 2.93 pos

If Mattb has stock drums and the park brake activates the shoes so if the pulsing goes away the front rotors are probably at fault.

Parking brakes should hold the car if you put it in drive and give it a little gas. They should stop a car that is moving. At 60 mph this would take hundreds of feet. The reason you should turn your wheels when you park pointed up hill is that the drum brakes are not as good in reverse.

Mattb does your wagon have disks or drums at the back?

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post #6 of 10 (permalink) Old 03-19-2017, 10:19 PM
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I get very dramatic pulsing in my brakes sometimes, usually when they are starting to get hot in traffic, and that causes my body to shake. I also notice my head bobbing if it gets bad enough. It almost scary honestly, and it either goes back to my misfire, which makes no sense, or the rotors. And it isnt the rotors because when I put brand new rotors on, the car still pulsed when hot. I think its a combination of chuggle and the misfire in my case.

Whatever it is, its seriously annoying and I hate it.

Good luck fixing yours though. Turning rotors is usually only 5 bucks a piece so it would be worth a shot.

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post #7 of 10 (permalink) Old 03-19-2017, 10:24 PM Thread Starter
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Originally Posted by Z09B4U View Post
Originally Posted by 4x4high
Correct for a Impala.

But if you look at Mattb's signature:
1996 Buick Roadmaster Wagon, 2.93 pos

If Mattb has stock drums and the park brake activates the shoes so if the pulsing goes away the front rotors are probably at fault.

Parking brakes should hold the car if you put it in drive and give it a little gas. They should stop a car that is moving. At 60 mph this would take hundreds of feet. The reason you should turn your wheels when you park pointed up hill is that the drum brakes are not as good in reverse.

Mattb does your wagon have disks or drums at the back?
It has rear drums. Replaced 3 years ago. I was going about 40 in a giant parking lot. It may have stopped eventually. It slowed to about 15 and then I released the parking brake.

So that was a good test. Cool. Thanks for the additional info!

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post #8 of 10 (permalink) Old 03-19-2017, 11:45 PM
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Quote:
Originally Posted by Mattb View Post
It has rear drums. Replaced 3 years ago. I was going about 40 in a giant parking lot. It may have stopped eventually. It slowed to about 15 and then I released the parking brake.

So that was a good test. Cool. Thanks for the additional info!
Having rear drums and doing what you did would be correct to test and if no pulsation then it is front brakes for sure. I have never seen a rear drum cause pulsation to be honest with you. It only takes .006" runout for you to feel brake pulsation.
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post #9 of 10 (permalink) Old 03-20-2017, 10:42 AM
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Quote:
Originally Posted by Mattb View Post
It has rear drums. Replaced 3 years ago. I was going about 40 in a giant parking lot. It may have stopped eventually. It slowed to about 15 and then I released the parking brake.

So that was a good test. Cool. Thanks for the additional info!
I think it's a safe bet to say your pulsing is from Front Brake Rotor Warpage. A shop could confirm if there is anough material to safely turn your Rotors or not. But whether you replace the rotors or not, would assume new Pads and HW are going on the car too.

In addition, I would strongly recommend you replace the Front Flex Hoses.....especially if they got any age to them. Even if externally they "appear" fine on the outside, they can break down internally and can cause the Caliper to Drag, which wears the pads and heats up the rotors causing them to Warp. These hoses could actually be the cause of your warping.

Happened to me and I was skeptical. but after numerous pads and rotor replacement and Vibration after a few thousand miles, I finally replaced these as well. Problem solved and brakes have been fine since even later going over to Stainless Hoses.

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post #10 of 10 (permalink) Old 03-20-2017, 09:10 PM Thread Starter
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Originally Posted by 4DoorSS View Post
I think it's a safe bet to say your pulsing is from Front Brake Rotor Warpage. A shop could confirm if there is anough material to safely turn your Rotors or not. But whether you replace the rotors or not, would assume new Pads and HW are going on the car too.

In addition, I would strongly recommend you replace the Front Flex Hoses.....especially if they got any age to them. Even if externally they "appear" fine on the outside, they can break down internally and can cause the Caliper to Drag, which wears the pads and heats up the rotors causing them to Warp. These hoses could actually be the cause of your warping.

Happened to me and I was skeptical. but after numerous pads and rotor replacement and Vibration after a few thousand miles, I finally replaced these as well. Problem solved and brakes have been fine since even later going over to Stainless Hoses.
The plan is to replace the rotors, pads, hoses, caliper bolts, and while I have it apart I'll replace the bearings and associated parts too.

Thanks for all the help.

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