Rear brake slave cylinders, differences? Revealed!

Lars S · Last edited by Lars S on Thu Feb 05, 2015 9:12 am; edited 1 time in total

I need new rear slave cylinders for my '73 412 and my shop have some but they are marked as "not for self adjusting" which my '73 has.
Where is the difference? the cylinder or the pistons...the dia seems to be the same 22,2 mm.

Lars S
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raygreenwood

Lars S · Posted: Thu Feb 05, 2015 9:09 am Post subject:

Now I know the differences in both the slave cylinders and the shoes since I had to buy both theese of the non self adjusting type for my self adjusting setup.

The slave cylinder for the non self adjusting setup has the same dia, shape and dimensions but the M8 threaded hole for the bolt is some 5mm higher up so I had to grind a bit in the back plate to get it there.
This cylinder has the sealing BEHIND the piston not around the piston like the one for self adjusting brakes.

The shoes are basically the same but the hole for fitting of the handbrake lever and the slot for the horizontal bar are some mm's off.

I fitted both the new cylinders and shoes but moved over the handbrake lever and the adjustable horizontal bar (on which the handbreak lever pushes) from the self adjusting setup leaving the self adjusting mechanism (the hook) out. I had to grind a bit on the thick part of the lever to get it free from one of the bolts holding the bearing cover.

So no I have manually adjustable brakes with some parts from the self adjusting setup, the breakes are adjusted at the horizontal bar and not at the bottom of the shoes since the self adjusting setup dont have adjusters at the bottom. So yes, I have to take the drums off to readjust the brakes.

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_________________
Porsche 914 -72, Bahia Red daily driver Smile

VW411 2-d -70, White, sold Sad

VW412 4-d, -73, Gold Metallic, daily driver
Suzuki T500, -69, Candy Gold, sold Sad

Suzuki K50, -77, Black, daily driver
BMW R69S -69, White, sold Sad

Husqvarna 118cc, -47, Black, Sold Sad

raygreenwood · Posted: Thu Feb 05, 2015 9:21 am Post subject:

Nice to learn the cylinder differences. Long ago I tried fabbing up the other parts to convert mine to auto adjust. I found the upper cross bar from several water cooled vehicles worked fine but there were lots of small fit issues getting it into the housing to fit.

I gave up when I realized that for the same time and effort I could devise a rear disc system. I have that figured out and will start fabrication as soon as my front end is finished. Ray

Lars S · Posted: Thu Feb 05, 2015 10:12 am Post subject:

Forgot to write that the slave cylinders and brake shoes I bought are the same as for late Type3.

/Lars S
_________________
Porsche 914 -72, Bahia Red daily driver Smile

VW411 2-d -70, White, sold Sad

VW412 4-d, -73, Gold Metallic, daily driver
Suzuki T500, -69, Candy Gold, sold Sad

Suzuki K50, -77, Black, daily driver
BMW R69S -69, White, sold Sad

Husqvarna 118cc, -47, Black, Sold Sad


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