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Umbrella handbrake
Posted: Mon Apr 06, 2020 8:33 pm
by mdmax72
Hi all.
Does anyone know if the cable that comes out of the umbrella handle is replaceable?
Doing a project at the moment and the cable had a lot of what appeared to be surface rust. Just cleaned it up with a wire brush and the cable has frayed. Not sure if the cable threads into the hex bar section.
Re: Umbrella handbrake
Posted: Mon Apr 06, 2020 10:50 pm
by Mike Smith
Yours may be Pinned in ?
Or Options
1) buy another Good Used Handle with a decent Cable from PRS -- Handles styles vary depending on year
2) - Drill it out and Solder in a new piece of Cable -- Be aware that the cables are wound in different directions for RHD and LHD Cars
Re: Umbrella handbrake
Posted: Tue Apr 07, 2020 11:55 pm
by mdmax72
Thanks for that Mike.
The cable is definitely not pinned in the hex bar. It appears the cable crimp is machined down from the hex bar itself. Then the cable is crimped in place. Making it all one piece. Bit of a bugger.
So this is what I’m going to do. Cut of the crimp section were it meets the hex bar. Then drill and tap the hex bar for a m6 thread. I’m then going to have a cable made with the correct end at the lever end and have threaded end at the other.
Will keep you updated
Re: Umbrella handbrake
Posted: Wed Apr 08, 2020 9:02 am
by Mike Smith
Reminder
Make sure you get a cable that is wound in the same direction as the the existing one
The Clamp and Release mechanism relies on this fact
Re: Umbrella handbrake
Posted: Wed Apr 08, 2020 11:35 pm
by mdmax72
Dont want to take it for granted. So maybe a daft question. As your the man in the know is the cable wound the same for left hand and right hand?
Re: Umbrella handbrake
Posted: Thu Apr 09, 2020 8:41 am
by Mike Smith
No Rich, as I said in my first post - The cables are DIFFERENT for LHD Cars and RHD Cars
However, you have an example so that is all you have to replicate - assuming that it was the correct cable in the first place
I assume that you have the actual locking mechanism apart?
You will notice that one of the parts is marked R on one side and L on the other -just another example that these units vary, depending which driving configuration Porsche built them to
The Handbrake cables relies on being twisted for the Locking and Release mechanism to work correctly
Cables in General
This is not a subject that I have studied in any depth, but I dismembered a cable years ago and also found that the Inner Cables are wound in the opposite direction to the Outer Cables
I guess under normal circumstance, it makes for a stronger cable that will not fray when twisted