Classic Audi Technical Mech/Tech Suspension & Brakes » Hydraulic "bomb" pressure unit

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Old 18-11-17, 10:03 PM   #1
urquattr085
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Default Hydraulic "bomb" pressure unit

Hi all

Need some help/guidance please

Disassembled the hydraulic pressure unit on my car only to find there is no O-ring (item 3 in diagram below)

Part no. 857612079, does anyone have the spec/size for this, can't find it anywhere on line or one for sale!

Many thanks
Geoff

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Old 18-11-17, 10:43 PM   #2
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Judging by the diagram, a new accumulator will come with the o-ring
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Old 18-11-17, 10:49 PM   #3
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Hi Mike.
Accumulator is working fine so don't need to replace.
Have been going through all the hydraulics with new copper sealing rings to cure a couple of leaks & noticed lack of O-ring when I came to refit to the regulator
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Old 20-11-17, 10:25 PM   #4
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After lots of cross-referencing part numbers/suppliers, it would appear this pressure unit is also used on some late 70's & 80's BMWs, notably 6 series.

Research into these cars & parts indicates the o-ring on the brake pressure accumulator is 15.3x2.4mm.

Ordered a pack of 2 for the grand sum of 4.06

Will see how they fit & post result for future reference.
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Old 21-11-17, 06:58 PM   #5
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Only just seen this must have been , well done finding that tiny part with a cross reference to BMW.

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Old 21-11-17, 07:03 PM   #6
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Quote:
Originally Posted by sinbin5t View Post
must have been
Would be more like it .....

Hours of research, they are on their way, will be happy to post that they fit
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Old 21-11-17, 07:06 PM   #7
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Quote:
Originally Posted by urquattr085 View Post
Would be more like it .....

Hours of research, they are on their way, will be happy to post that they fit

Yep Z's galore i think

I am sure they will be bang on and you will be a happy man !

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Old 21-11-17, 07:21 PM   #8
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Quote:
Originally Posted by urquattr085 View Post
Would be more like it .....

Hours of research, they are on their way, will be happy to post that they fit
As Bruce i also missed this one, well done for spending hours cross referencing, hopefully we will all benefit form your tenacity. Nice one.

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Old 21-11-17, 09:29 PM   #9
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Quote:
Originally Posted by vorsprung durch technik View Post
As Bruce i also missed this one, well done for spending hours cross referencing, hopefully we will all benefit form your tenacity. Nice one.

Ta
I actually really enjoy that sort of research. Surprising what else you find out.
What else is there to do on these dark nights
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Old 21-11-17, 09:53 PM   #10
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Quote:
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Ta
I actually really enjoy that sort of research. Surprising what else you find out.
What else is there to do on these dark nights

That could be misconstrued
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