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> Still another 911 e-brake thread, there are many like it but this one is mine....
John
post Jun 28 2006, 12:56 AM
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Eric, since you asked so nicely in the thread that we hijacked, here are some pics of my e-brakes using stock 914 brake cables. I just finished them up, and there are some slightly fuzzy pics, but here they are..... (pre-blog even)






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John
post Jun 28 2006, 12:57 AM
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John
post Jun 28 2006, 12:58 AM
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John
post Jun 28 2006, 01:00 AM
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John
post Jun 28 2006, 01:00 AM
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John
post Jun 28 2006, 01:12 AM
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5 clicks and they are SOLID.

I wanted to utilize standard cables so they can be replaced if required and so others may benefit from this approach.

I created a pivot by drilling a hole in the trailing arm and welding a nut over the top of the hole (so that the threads could extend into the trailing arm. I am using a shoulder bolt with a bronze bushing as the pivot. The belcrank I designed is as thick as would easily fit inside the stock 914 cable ends (3/16"?) .

I played with the geometry until I felt comfortable that the stock brake handle would provide enough travel to actuate the e-brakes, and came up with the location of the pivot point.

I made one modifications in the middle that didn't show up well in the pics.

The 40mm anchor block that I originally welded to the backing plate was cut off of the backing plate and welded to the trailing arm for strength.

Through trial and error, I decided not to utilize the small helper spring for the bow-ties.

I am also only using single bow-ties to expand the shoes. I read somewhere that some later 911's were done that way (but I didn't verify that).

So far, they work well beyond my expectations. They feel as solid as the ones in my 911 Turbo.

(I know I need to touch up a few scratches I made in my paint. Luckily I didn't scratch through the POR-15 anywhere.
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RON S.
post Jun 28 2006, 04:52 AM
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John,

That is absolutely beautiful (IMG:style_emoticons/default/thumb3d.gif) (IMG:style_emoticons/default/thumb3d.gif) (IMG:style_emoticons/default/thumb3d.gif)

Clean,and fully functional. (IMG:style_emoticons/default/beerchug.gif) (IMG:style_emoticons/default/beerchug.gif) (IMG:style_emoticons/default/beerchug.gif)


Now,bring a set with you to Hershey next year,and I'll bring'em home to install on mine.


Ron
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turboman808
post Jun 28 2006, 05:58 AM
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That looks really nice. Dam I want a emergency brake already (IMG:style_emoticons/default/sad.gif)
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Jeroen
post Jun 28 2006, 06:13 AM
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I really, really like the belcrank idea
No need for custom cables / crappy routing

Excellent thinking (and execution) !!!
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Eric_Shea
post Jun 28 2006, 10:40 AM
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Me likes too...

This had me thinking all last night about a threaded rod like what's on the back end of the 911 cable.

Hmmmmmmmmmm (IMG:style_emoticons/default/idea.gif)
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Aaron Cox
post Jun 28 2006, 10:43 AM
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how much? (IMG:style_emoticons/default/smile.gif)
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John
post Jun 28 2006, 11:14 AM
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QUOTE(Aaron Cox @ Jun 28 2006, 08:43 AM) *

how much? (IMG:style_emoticons/default/smile.gif)


For what?

I rebuilt old trailing arms I had.
I bought the e-brakes from OTTO.


There is quite a bit of trial and error that went into this project before the end result was achieved.



If I were to put together some sort of hardware only kit with templates of where to weld nuts to the trailing arms, I would probably be around $50 + shipping for the pair.



Unfortunately, at this time I have my hands full of another little project that has been delayed beyond all my wildest dreams (tripple gauge kits), and I can not take on any more projects until that one is off of my plate. (I hate relying on others to help me with projects {can you say screen printers suck ass?})

I know a couple people I need to call now and chew on their asses......
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Aaron Cox
post Jun 28 2006, 11:19 AM
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how much and what year ebrake assemblies?
they work with stock 914/6 rotors? or do they need to be vented?

looks killer.

definitely make up hardware kits (IMG:style_emoticons/default/smile.gif)
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John
post Jun 28 2006, 12:43 PM
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The e-brake assemblies can be any year 1971-1989, but the early ones (steel trailing arm ones {1971-1973}) will fit without modifying the rear wheel bearing retainer bolt holes. In 1974, the 911 went with larger rear wheel bearings and aluminum trailing arms.

The later e-brake assemblies need to be modified to work with the smaller bolt pattern (holes need to be slotted) and the 914 bearing retainers need to be modified to work with the e-brake backing plates. (It's simpler to use early parts)

Mine happened to be the later parts. I believe the price range for the e-brake assemblies may vary but I found around the $150+/- range to be about right.

The rotors and calipers are pure 911SC parts (which are cheaper and more available than 914/6 parts).

I wanted to use parts that are common and available and as inexpensive as possible.

I can buy rotors and pads at the local FLAPS.

I even went so far as to switch to 911 CV joints mounted to modified 914/6 axle shafts. My inner and outer rear hubs are all 911 parts, as are my transmission output flanges........
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echocanyons
post Jun 28 2006, 01:25 PM
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Excellent idea, and execution!
This owuld solve my no e-brake problem and seems much more doable than to have the cables modified.
I would certainly be interested in the modification parts if anyone is willing to produce them?
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John
post Jun 28 2006, 01:39 PM
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I could do the hardware kits less e-brake parts, but it won't be very soon. I would estimate fall (Aug/Sep time frame).

I must complete my current project before taking on another one.
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Eric_Shea
post Jun 28 2006, 01:42 PM
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QUOTE
they work with stock 914/6 rotors?


I'd be willing to bet you need a 911 rotor.

Maybe Rich can do some measure'n for us? I'm still waiting on that front rotor combo measurement (IMG:style_emoticons/default/lol3.gif)
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John
post Jun 28 2006, 01:53 PM
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Like I said,

QUOTE
The rotors and calipers are pure 911SC parts (which are cheaper and more available than 914/6 parts).


Yes they are 911 vented rear calipers. They are available through the usual suspects and were less expensive than 914/6 stuff the last time I checked.
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davep
post Jun 28 2006, 02:18 PM
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QUOTE(Aaron Cox @ Jun 28 2006, 09:19 AM) *

they work with stock 914/6 rotors? or do they need to be vented?

I've never seen 914/6 rear rotors with an internal drum.
Perhaps the 912E rear rotors?
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Jeroen
post Jun 28 2006, 04:19 PM
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do the SC rear calipers bolt straight up onto the 914 trailing arm?
any mods/spacers?
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