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914World.com _ 914World Garage _ E-Brake is it hydraulic or mechanical

Posted by: echocanyons Sep 14 2005, 01:06 PM

I wonder if the e-brake is purely mechanical or if it would be influenced by air in the lines and other similar hydraulic issues

I ask this because after replacing by brake pads and a carved up rotor I have no e-brake function on one wheel and very little resistance on the handle.

I need t osee if it is because of the air or if it needs a thorogh inspection for problems.

I also have a mushy pedal and need to bleed the brakes again tonight.

Thanks

Posted by: tat2dphreak Sep 14 2005, 01:08 PM

purely mechanical IIRC

Posted by: ArtechnikA Sep 14 2005, 01:11 PM

QUOTE (echocanyons @ Sep 14 2005, 03:06 PM)
I wonder if the e-brake is purely mechanical...

I ask this because after replacing by brake pads and a carved up rotor I have no e-brake function on one wheel and very little resistance on the handle.

I also have a mushy pedal...

you have *all* the symptoms of excesive venting clearance...

the handbrake is 100% mechanical, but it doesn't move the inner pad *much*.
if the venting clearance is excessive, you'll run out of available motion before you achieve adequate pressure.

0.004" -- no more..

Posted by: echocanyons Sep 14 2005, 01:25 PM

I thought the clearance was 2mm (0.078inch)?

Posted by: ArtechnikA Sep 14 2005, 01:32 PM

NO.

it is not 2(!)mm and it is not 0,2mm.

it is wrong in the Spec Book, which is why it's wrong in the Haynes.
somebody 30 years ago typed "2" instead of "1" and it never goes away...

search for "venting and clearance" and you'll see the countless threads, every 2 months or so, in which this is discussed...

Posted by: michelko Sep 14 2005, 01:34 PM

QUOTE (echocanyons @ Sep 14 2005, 11:25 AM)
I thought the clearance was 2mm (0.078inch)?

let´s make it a 0,2mm and you are right.
( This say´s the factory manual)

Posted by: tat2dphreak Sep 14 2005, 01:45 PM

one more thing to check is the cables, if the cable is adjusted too loose, it won't actuate properly... just to offer up another(though MUCH less likely scenario)

Posted by: echocanyons Sep 14 2005, 01:49 PM

oops I meant 0.02mm

That is good to know and here I thought I screwed something up.

After 10yrs of 914 ownership I admit this is my first time changing the rear brakes (with the exception of the monoblock upgrade on my other car).

Posted by: lapuwali Sep 14 2005, 01:56 PM

QUOTE (echocanyons @ Sep 14 2005, 11:49 AM)
oops I meant 0.02mm

That is good to know and here I thought I screwed something up.

After 10yrs of 914 ownership I admit this is my first time changing the rear brakes (with the exception of the monoblock upgrade on my other car).

It's not 0.02mm, that's way too small, and you'll probably have the brakes lock up from heat expansion. 0.004 inches is 0.1mm. The range in the later editions of Haynes says 0.004 to 0.008 inches, or 0.1 to 0.2mm. I set mine to 0.005" cause that's the thinnest feeler gauge I have, and they work fine.

Posted by: echocanyons Sep 14 2005, 02:19 PM

0.004-0.005 is what I will use depending on how low my feeler guages go

Thanks everybody