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Old 12-12-2002, 03:02 PM   #1
AZguy
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Default L200 Parking Brake

I have a 2002 L200 with 4-wheel disc brakes. I know how the parking brake works if you have rear drum brakes, but don't understand how they work with rear disc brakes.

One time I inadvertently left the brake on and started driving. After the car moved 30ft or so I got an audible warning that I left the brake on and immediately released it. But I don't understand how I was able to drive the car in the first place with the brake on. Perhaps my parking brake is broken.

Can anyone tell me how the parking brake works on my car?

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Old 12-12-2002, 04:44 PM   #2
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2003 VUE 2.2L
2002 L-Series 2.2L Sedan
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I've noticed that in the L200 you can move forward with the brake on pretty easily, but try moving in reverse and you don't move a bit.

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Old 12-12-2002, 05:56 PM   #3
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Here you go, check out this site:
http://www.howstuffworks.com/disc-brake3.htm

Best I could do on short notice

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Product Specialist, fellow Saturn Employee and Enthusiast

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Old 12-13-2002, 12:34 AM   #4
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Default

Cool! Thanks for the tip on the How Stuff Works webpage. I took a look at it and it says the emergency brake cable actuates the disc brake piston through a mechanical cam of sorts. Makes sense. Now if I can only figure out how I was able to drive with the brake on.

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Old 12-13-2002, 12:54 AM   #5
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Idea

Unless you pull the parking brake ALL the way to the tighest level, usually the P-brake is just enough to HOLD the car still only.

There's no way you couldn't drive the car with the parking brake on. Like I said, unless you lock the P-brake level so high (or tight) which drag the car so much to make you realize. The engine torque + Transmission first gear ratio usually can overcome the parking brake without issue.

The only ISSUE you may have is the drag force from the locked brake is so much which generate LOTS of heat to fry the discs and the brake pads or even the rear calipers.........of course, you need to drive some long distance before this disaster would happen.

Don't forget the motor can move a 3000+ lbs car with decent acceleration, you think a couple of little rear disc brakes are strong enough to hold the car against the engine? (Esp on FWD cars which always do the pulling on the rear axle......)

The brakes MAYBE strong enough to LOCK the rear wheels only...but the tires will be dragged and squeaked if the motor can take this load. You'll surely need 2 new tires after such crazy act though.

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Old 12-13-2002, 01:38 AM   #6
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Unless, my right foot is just that heavy, but all cars I've driven can move with the parking brake, especially my parents' Fords and my old K-car, and even my SW2, although it was much more noticeable that it was on, in my SW2, than those other cars.

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Old 12-13-2002, 02:51 AM   #7
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I drive my car with the parking brake on all the time - sideways though.

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Old 12-13-2002, 11:40 AM   #8
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Not all cars with rear disc breaks function that way. Many modern e-brake systems on cars with rear discs work this way....

There is a SMALL drum built into the rear hub that acts as the parking break. Most German and Japanese vehicles work this way. That would explain why your car would still drive forward easily with the e-brake on.

On older American Cars (1950's) the emergency brake was a drum brake around the drive shaft!

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Old 12-13-2002, 11:41 AM   #9
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Quote:
Originally posted by ProDarwin
I drive my car with the parking brake on all the time - sideways though.
Hey Darwin, I'd like to take lessons from you... I'd be able to get out of tight parking spaces.

I guess you guys are correct. I usually don't put the parking brake on full tilt, just enough to feel some resistance in the handle. And at that setting the engine would probably move the car as if the brake weren't on, which is exactly what happened. I never noticed a difference in driveability and if it weren't for the alarm going off to remind me the parking brake was on, I probably would've toasted the brake pads.

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Old 12-13-2002, 07:11 PM   #10
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Default

yea, the parking brake alarm is handy... I dont normally use it unless I park on a hill -- and i sometimes forget.

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Old 12-13-2002, 07:43 PM   #11
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Roll Eyes

That's why I like to drive Manual cars, since using the Parking brake (Yea, it's called PARKING brake) is part of the routine.

The 'P' in the auto tranny is simply using the Motor mounts to hold the car still, which is not a good idea in long run since the mounts will be stressed out more.

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