Emergency brake not working properly

Tiny
BREANNANP
  • MEMBER
  • 1999 BMW 318I
  • 4 CYL
  • 2WD
  • MANUAL
  • 180,000 MILES
Our emergency brake works “when it wants to”.
If we park down hill, hood facing down, it works.
However, if we park uphill, good facing up the hill, the E brake won’t catch. What could this be or mean?
Tuesday, May 7th, 2019 AT 8:44 AM

3 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi Breannanp,

The way this works is it is called parking brake shoes and there is a set of brake shoes inside the rear rotor. When you pull the brake, it pulls a cable which pulls a lever, which presses the shoes against the inside part of the rotor. This friction holds the vehicle in place. However, inside each rotor there are two shoes. One called the primary shoe and the other called the secondary. One of them holds the vehicle when the weight is trying to move the vehicle forward and the other holds the weight of the vehicle when it is trying to move rearward.

It holds one way and not the other because they are out of adjustment and when you pull the brake handle only one of the shoes in each rotor are making enough contact to hold the vehicle in place.

I attached the adjustment procedure but if they have not been inspected in a while, you probably want to take them apart and replace what is needed.

Let me know if you have any questions. Thanks

https://www.2carpros.com/articles/parking-brake-shoe-replacement
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Tuesday, May 7th, 2019 AT 7:09 PM
Tiny
BREANNANP
  • MEMBER
  • 2 POSTS
Thank you very much, your explanation made it very easy to understand. I have it at a mechanic currently and was curious of what it could be so I’d have a price estimate before I get a complete heart attack. Thank you again!
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Tuesday, May 7th, 2019 AT 11:43 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
To replace parking brakes and hardware, it looks like the parts range from $25.00 to $75.00 total. Labor will be about 1.5 -2.5 hours depending on the facility. Then you multiply that amount of time by their door rate and you will get your price.

Unfortunately there is not standard pricing for these repairs but I would expect it to be a couple hundred dollars if they have to replace them.

If they only need to adjust them then I would expect that should be about a $100.00 or less.
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Wednesday, May 8th, 2019 AT 2:25 PM

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