Why doesn't my right ebrake work?, It's the asymmetric cables, dummy. |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Why doesn't my right ebrake work?, It's the asymmetric cables, dummy. |
davesprinkle |
Dec 3 2009, 10:14 AM
Post
#1
|
Senior Member Group: Members Posts: 720 Joined: 13-October 04 From: Berkeley, CA Member No.: 2,943 Region Association: None |
Here's why most modern cars have the ebrake handle in the middle of the car -- it's so the cables running to the wheels have identical length and path. How do I know? Here's the anecdote:
For the last year, I've been struggling with my ebrake system. The right caliper just wouldn't clamp as tightly as the left. I've got rebuilt calipers, new pads, new cables, proper clearance, but no worky. Finally found out why. It's the internal drag of the actuation cables. The passenger-side cable is substantially longer than the driver side. Also, the right-side cable has 3 right-angle bends vs the left-side cable with none. This results in so much internal friction that the cable just binds solid when it's pulled. I was able to improve the situation somewhat by lubricating the cable. Still not perfect, but much better. |
tat2dphreak |
Dec 3 2009, 01:06 PM
Post
#2
|
stoya, stoya, stoya Group: Benefactors Posts: 8,797 Joined: 6-June 03 From: Wylie, TX Member No.: 792 Region Association: Southwest Region |
new cables should not bind, perhaps it was bent before you got it?
|
davesprinkle |
Dec 3 2009, 01:27 PM
Post
#3
|
Senior Member Group: Members Posts: 720 Joined: 13-October 04 From: Berkeley, CA Member No.: 2,943 Region Association: None |
new cables should not bind, perhaps it was bent before you got it? Wayne, even new cables aren't free of friction. But don't take my word for it. Set aside your skepticism and try it yourself. Pull off your cable. Stretch it out straight. See how easily the inner cable slides. Nice. Now bend the cable through 90 degrees. It doesn't have to be a sharp radius bend, 4" will do. Now when you move the inner cable, you'll note substantially higher force is required. The thing is, you're going to have 3 of these bends in the cable when it's installed in the car. |
tat2dphreak |
Dec 3 2009, 01:59 PM
Post
#4
|
stoya, stoya, stoya Group: Benefactors Posts: 8,797 Joined: 6-June 03 From: Wylie, TX Member No.: 792 Region Association: Southwest Region |
new cables should not bind, perhaps it was bent before you got it? Wayne, even new cables aren't free of friction. But don't take my word for it. Set aside your skepticism and try it yourself. Pull off your cable. Stretch it out straight. See how easily the inner cable slides. Nice. Now bend the cable through 90 degrees. It doesn't have to be a sharp radius bend, 4" will do. Now when you move the inner cable, you'll note substantially higher force is required. The thing is, you're going to have 3 of these bends in the cable when it's installed in the car. I understand what you mean, but when I installed my new one, I did not get these issues... maybe I got lucky? JJ-how did you set that up? that's great, imo. I hate how the seat interferes with the e-brake |
Lo-Fi Version | Time is now: 1st June 2024 - 05:08 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |