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Micha
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According to catalogues on the web, there should be a small spring and a steel ball at the brake adjuster mechanism on the front. I could not find it on my project bike, so I went and purchased it, but could not find how to install them. Looking at those catalogs again did not bring me much further. I enclosed a drawing of how my front brake looks like, and I mean parts no 3 and 4. I would appreciate your help of how and where to install it, and why are they there for.

Also added a pic. of the other parts I have there and I would also like to know what are A & B there for, and is there any adjustment/calibration needed while assembling them?
Thank you kindly in advance – Michael

  • 20180719_191834_resized.jpg
  • lkydh.png
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Michael Steinmann
R51/3 1952
Engine Nr. 529466

MikeL46
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It looks like the spring and

It looks like the spring and ball gon in first, the the adjuster. The spring loaded bal keeps the adjuster from turning freely. As in - turn,click; turn,click; etc.

Mike

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Micha
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Well I tried this, but the

Well I tried this, but the ball can not enter the hole.
Any one please?
And what about the other parts? I am in the proccess of rebuilding the front and can not progress.

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Michael Steinmann
R51/3 1952
Engine Nr. 529466

Beemer100
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guess I am repeating what

guess I am repeating what others already proposed. Get yourself some documentation about these kind of bikes (Ersatzteilliste, manual etc). That will make your life way easier ...

The other parts on the picture are for the 2 cam front brake. Not sure which one you have? The parts picture is for the 1 cam brake and therefore you don't find these parts.

The ball must go into the little hole of the adjusting screw (spring has to go in first!). If not the ball is too big in diameter

Klaus

Beemer100
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oups ... just see, the parts

oups ... just see, the parts picture IS for the 2 cam brake. Number 12 ist the funny looking bolt. You need this to pre-adjust one of the brake shoes. For the spring I would need to take off my brake ... I remember the R75 brakes have this spring, but not sure for the R51

Micha
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Thanks, Beemer100. I have

Thanks, Beemer100.
I have the workshop manual and the "Behelfs Katalog", both from Huggett, the swiss guru (and I cannot afford at the moment 200 US Dollars to be spent on that book that is so much recommended here) and these parts are not mentioned at the /3 & R68 sector at all but do appear at the Stemler catalog under the /3 (where the parts drawing I added is from) and in the drawings that Huggett's site supplies (enclosed this time).

I'm beginning to understand (at least I think so…) what's up on the front section, and came to the following conclusion (would like to get a correction or more info):
There were 3 kinds of front brakes at the R51/3:
2 had half hub drum:
1) Normal old-style mono brake lever (simplex)
2) Double lever (Duplex )

1 had full hub drum, on later models.
I think I have the duplex double operated one.
Here's a drawing from Huggett's site:

  • lkydh2.png
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Michael Steinmann
R51/3 1952
Engine Nr. 529466

Beemer100
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you are correct with the 3

you are correct with the 3 options. The duplex half drum brakes were pretty fragile. Check the braking plate if it has a crack ... almost all of them have a little crack.

Go on Rabenbauer.com. You go for the /3 ad you see the details of the duplex brake. Look at numbers 81 and 77 and you see the 2 parts you can't locate.

Klaus

Micha
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Thanks beemer. I am not sure

Thanks beemer.
I am not sure what you mean by "Braking Plate" - is it the outer alu-cover?

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Michael Steinmann
R51/3 1952
Engine Nr. 529466

Beemer100
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yep

yep

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