[T3] Push-rod length...

[Phil Hof]

There is a VW template I've been sent and attached that shows setting the
pedal stop plate so that there is about 8-3/4" (actually, 225mm) from the
pedal tip to the bulkhead.  This is required for tandem systems so if one
side fails there is still enough pedal travel left to fully pressurize the
remaining half of the system.

http://images.thesamba.com/vw/gallery/pix/759675.jpg

With this in mind, unless you have one of the very few unmolested 40 year
old cars left on earth, start by setting the pedal stop to get this 8-3/4"
distance, then adjust the rod length to get 1mm rod play (10mm at the pedal
tip).  This will ensure the safety of the system as designed is maintained.

The rod length measurement is not important-- the pedal travel and rod play
are.  The rod length is just the means to an end.

-Phil

> Date: Thu, 30 Dec 2010 17:56:24 -0500 (EST)
> From: Bobsnotch at aol.com
> Subject: Re: [T3] Push-rod length...
>
> I think we've been down this road before. It  appears that someone 
> made a mistake in the dimension, at least for the  tandem MCs. I've 
> never seen a published number that agreed with the  untampered late 
> pushrods that I've measured.  
>
> The number I've  recorded for my own use is 152-153 mm.
>
> I just pulled those numbers out of the blue Bentley. It's actually the  
> starting point for adjustments that the factory made to each car to allow
for  
> manufacturing tolerances. It's measurement is from the tip to the center
of 
> the  hole (to attach the brake pedal). You still have to keep the 1mm 
> clearance of  the rod to cylinder.