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Brake Master cylinder thrust rod?

The place to discuss the R 90 S as well as the R90S Worldnet archives!
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rd400f
Posts: 28
Joined: Thu Apr 24, 2014 3:20 am

Brake Master cylinder thrust rod?

Post by rd400f »

Hi
Part 4 in the parts diagram...Thrust Rod.
Can anyone tell me the length and diameter please?
Thanks
Richard
Thrust Rod.JPG

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sblaylock
Posts: 189
Joined: Thu Jul 22, 2010 1:05 pm
Location: Victoria, BC. Canada

Re: Brake Master cylinder thrust rod?

Post by sblaylock »

Hey Richard,

Sorry for the late reply.

The thrust rod for the R90S and R90/6 have the same part number - ...309. I have a '74 R90/6 in the shop and I'm rebuilding the master cylinder so I can give you the sizing for this one.

5.97mm diameter.
26.50mm length.

Let me know if you plan to spin one up as the ends have a radius and I can give you those measurements and photos if needed.

I hope this helps,
Scott
Scott Blaylock
Stoney Peak BMW Service
Victoria, BC. Canada
BMW Classic and Vintage Motorcycle Service and Restoration
service@stoneypeak.com

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schrader7032
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Re: Brake Master cylinder thrust rod?

Post by schrader7032 »

Looks like the part number 34311233309 is used on all models with the undertank mastercylinder.
Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.

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sblaylock
Posts: 189
Joined: Thu Jul 22, 2010 1:05 pm
Location: Victoria, BC. Canada

Re: Brake Master cylinder thrust rod?

Post by sblaylock »

Hi Kurt,

Hopefully the R25 will be back on the road soon. It looks like you have it close to being figured out.

In my very quick search I noticed the push rod (34 31 1 233 309) is NLA on the sites I checked. Unless Richard can find another used one I'm thinking he'll probably need to turn a new one.

Scott.
Scott Blaylock
Stoney Peak BMW Service
Victoria, BC. Canada
BMW Classic and Vintage Motorcycle Service and Restoration
service@stoneypeak.com

rd400f
Posts: 28
Joined: Thu Apr 24, 2014 3:20 am

Re: Brake Master cylinder thrust rod?

Post by rd400f »

sblaylock wrote:
Tue Jan 04, 2022 5:56 pm


5.97mm diameter.
26.50mm length.

Let me know if you plan to spin one up as the ends have a radius and I can give you those measurements and photos if needed.

I hope this helps,
Scott
Hi
Thanks that the info I needed.
I will whip one up in the next few weeks.
The end radius shouldn't be an issue..I can figure that one out.
Thanks again
Richard

rd400f
Posts: 28
Joined: Thu Apr 24, 2014 3:20 am

Re: Brake Master cylinder thrust rod?

Post by rd400f »

Hi
Got bored so knock this up.
pushrod.jpg
316 Stainless so should be as good as new.
Thanks
Richard

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sblaylock
Posts: 189
Joined: Thu Jul 22, 2010 1:05 pm
Location: Victoria, BC. Canada

Re: Brake Master cylinder thrust rod?

Post by sblaylock »

Looks good.

You should make a few more so we'll all know who to email when we need one :)


Scott.
Scott Blaylock
Stoney Peak BMW Service
Victoria, BC. Canada
BMW Classic and Vintage Motorcycle Service and Restoration
service@stoneypeak.com

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