07-03-2009, 07:44 PM
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Shed troglodyte
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Join Date: Jul 2007
Location: Oz
Posts: 492
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 Quote:
Originally Posted by Anfanuts
Chris, there are dozens of Threads on brake proportioning valves. Try a search using "proportioning". Some have pics of them dissected.
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My initial question on this thread was how to ascertain that the PV was actually working. I've since been to the local 'skidpan' and it does seem to work, or at least, the rear wheels don't seem to lock prematurely during a panic brake and the car doesn't attempt to swap ends. So whatever the guys did inside this PV seems to work - I got all of the old components back with the refurbed PV last year and I know these guys and trust them.
I dropped the other piston and broken cup seal in to them yesterday (Friday) and will wait to see what they come up with. I'll keep you posted even if it all turns up nothing 
Regards,
Chris
__________________
Own - 1970 1750 GTV
Want - 1969 Duetto (in addition)
Also own - various other Italian and German rotboxes
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07-06-2009, 10:32 PM
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...in the Garage...
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Join Date: Nov 2005
Location: Oakville, Canada
Posts: 1,344
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I'm following this tread with interest as well. I was contemplating initiating a thread about this seal back when I started a similar one concerning the DPWA seals. I made CAD drawings of both this seal and the DPWA seal but decided it was best to chase only one seal at a time. I was never able to find an off the shelf seal for the DPWA....and my gut feel tells me that this seal will be the same (I hope I'm proven wrong however). Now the seal from my valve was totally cracked and deteriorated and the seal from a second valve I bought fared no better.
FWIW....the ATE part number of my seal reads "6386 2-25"
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07-13-2009, 02:10 AM
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Shed troglodyte
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Join Date: Jul 2007
Location: Oz
Posts: 492
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Cup seal found
I finally got around to phoning the guys at CBC. They found the cup seal - it is a generic seal, part number KP1659, and seems in plentiful supply. I bought two at $11.00 each and fitted one onto the piston over the weekend. It fits perfectly. I'll get the correct o-rings later this week and finish the job.
I've attached a couple of photos - the old, split seal is on the right.
Hope this helps,
Chris
__________________
Own - 1970 1750 GTV
Want - 1969 Duetto (in addition)
Also own - various other Italian and German rotboxes
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07-13-2009, 07:38 AM
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Registered User
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Join Date: Jan 2008
Location: Raleigh, North Cackalacky
Posts: 265
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If anybody knows of a source in the USA that would be great...if they could post that.
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Rockiemosley--Currently 1974 Alfa Romeo GTV 2000
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07-13-2009, 08:37 AM
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La Dolce Veloce
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Join Date: Sep 2003
Location: Connecticut, USA
Posts: 2,849
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Quote:
Originally Posted by rockiemosley
If anybody knows of a source in the USA that would be great...if they could post that.
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__________________
Bob Farace
1971 Alfa Romeo 1750 Spider Veloce
1987 Alfa Romeo Milano Gold
Director, Connecticut branch, Scuderia Non Originale
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07-13-2009, 10:30 AM
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Senior Member
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Join Date: Dec 2004
Location: At the other end of the state
Posts: 2,718
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Kits? I would take a few off of your hands. I have a valve hanging on the garage wall that needs rebuilding and a couple of other cars that can use them.  |
07-13-2009, 10:35 AM
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Certified Oldschooler
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Join Date: Aug 2007
Location: Spicewood, Texas (in the boonies)
Posts: 1,506
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Ditto here, 2-3.
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Anfanuts; Ph.A., B.S.A., U. of NOTASME
Now - '69 1750 Spider Veloce ( pictures)( and more) 10562.1480323 (since '75 for that early mid-life crisis!);
Gone - '69 1750 Berlina (wish I still had)
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07-14-2009, 03:40 AM
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Shed troglodyte
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Join Date: Jul 2007
Location: Oz
Posts: 492
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Now that I have a part number, I'll spend a bit of time doing the rounds of the local auto and hydraulic suppliers just to see whether these cup seals are commonly available. I'll enquire about overseas sales while I'm at it.
Chris
__________________
Own - 1970 1750 GTV
Want - 1969 Duetto (in addition)
Also own - various other Italian and German rotboxes
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07-17-2009, 07:31 PM
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Shed troglodyte
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Join Date: Jul 2007
Location: Oz
Posts: 492
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For the non-metric folk the following o-rings fit.
Small piston o-ring BS112 (ID 0.5" CS 3/32")
Rear o-ring BS120 (ID 1.0" CS 3/32")
The standard rear o-ring has a 2.00mm CS whereas the BS120 is about 2.57mm so it's a bit tall, but it fits well and compresses easily.
Let me know how you get on with the cup seals.
Chris
__________________
Own - 1970 1750 GTV
Want - 1969 Duetto (in addition)
Also own - various other Italian and German rotboxes
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07-26-2009, 08:20 PM
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...in the Garage...
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Join Date: Nov 2005
Location: Oakville, Canada
Posts: 1,344
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A search against "KP seals" shows that SKF makes polyurathane seals with a KP designation....see this link...
KP Seal - SKF Polyseal Inc./Products/Piston Seals
if this is in fact from this seal family.....a check on the SKF fluid compatibilty chart...
Fluid Compatibility - SKF Polyseal Inc./Products
...is showing that this seal is not compatible with DOT3 brake fluid.
Chris, could you investigate a little bit further with these guys who the seal manufacturer is for these seals? |
08-06-2009, 08:31 PM
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Shed troglodyte
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Join Date: Jul 2007
Location: Oz
Posts: 492
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I've done a bit of hunting around and found that these seals are in relatively plentiful supply here in Oz. One supplier (QuikSpeed Brakes - a local company here) has 50 of them in their warehouse at about $US7.50 each. If I can get a guaranteed purchase at the overseas end, I'll buy them and sell them on to you guys at cost plus postage. If you wish, I'll send one each to someone in either the US, Canada or the UK so you can fit it and make sure yourself that it is the correct cup seal.
Be aware though, that I'm new to this type of international trading, any sort of trading actually, so you will have to be patient with me. I'm also not in it for the money
If you want to take a straw poll and let me know who is interested, we can go from there.
Regards,
Chris
__________________
Own - 1970 1750 GTV
Want - 1969 Duetto (in addition)
Also own - various other Italian and German rotboxes
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08-06-2009, 09:18 PM
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Senior Member
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Join Date: Dec 2004
Location: At the other end of the state
Posts: 2,718
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I will take 3 kits. |
08-06-2009, 09:36 PM
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...in the Garage...
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Join Date: Nov 2005
Location: Oakville, Canada
Posts: 1,344
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Quote:
Originally Posted by 1750GT
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08-06-2009, 09:42 PM
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Shed troglodyte
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Join Date: Jul 2007
Location: Oz
Posts: 492
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Quote:
Originally Posted by velocedoc
I will take 3 kits. |
Regards as always,
Chris
__________________
Own - 1970 1750 GTV
Want - 1969 Duetto (in addition)
Also own - various other Italian and German rotboxes
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08-06-2009, 09:55 PM
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Shed troglodyte
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Join Date: Jul 2007
Location: Oz
Posts: 492
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Quote:
Originally Posted by 1750GT
Chris, any thoughts/opinions about my comments above? Again, if these seals are made by SKF...they may not be compatible with brake fluid.
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I'm no expert on rubber compounds and compatabilities but the seals I've found locally are compatable with all commonly used automotive hydraulic fluid. I've had no luck cross correlating the kit number with other manufacturers (eg: Girlock, PBR etc.). It just seems to be a one off, but oddly, in good supply locally. The guys I've dealt with can't even tell me what other cars use this seal, though I guess it would be old Fiats, Beemers and Volvos.
The supply of arcane bits and pieces like this comes as no surprise as here in Oz we have a large number of old, imported vehicles still on the roads. Times are slowly changing, but, for example, you can still get seals for all manner of old British cars across the counter. I've a good mate who owns several 1920s Austins and a couple of Lagondas (as well as his AMV8 and the odd Ferrari or two) and he seems to have no trouble getting all of the rubber bits he needs without relying on specialist suppliers.
Chris
__________________
Own - 1970 1750 GTV
Want - 1969 Duetto (in addition)
Also own - various other Italian and German rotboxes
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