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. |
PRS914-6 |
Dec 3 2009, 10:47 PM
Post
#2
|
Excellence Magazine Project 914 3.6 Group: Retired Members Posts: 1,278 Joined: 20-May 06 From: Central California Member No.: 6,031 Region Association: None |
The length of the cable should not effect it. The cable has a T yoke that will equalize the pull. Of course if you have cables that need lubing they should probably be replaced after 30 years of grit and grime. I have stock cables and handle with 911 rears and they work perfectly (new cables and everything clean)
|
davesprinkle |
Dec 3 2009, 11:35 PM
Post
#3
|
Senior Member Group: Members Posts: 720 Joined: 13-October 04 From: Berkeley, CA Member No.: 2,943 Region Association: None |
The length of the cable should not effect it. A longer cable will have more of the inner cable in contact with the outer cable, so the length WILL affect the friction. QUOTE The cable has a T yoke that will equalize the pull. Yes, the mechanism has a force balance. But it cannot compensate for friction mismatch. QUOTE Of course if you have cables that need lubing they should probably be replaced after 30 years of grit and grime. As I mentioned, my cables are new. |
Lo-Fi Version | Time is now: 8th June 2024 - 03:00 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 ... |