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#1
November 25th 2007, 21:37
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Rear Brake Proportioning Valve
I am beginning to plumb my brake system in my Super, and since it now has disc brakes all around, and I will replace all the hoses and hard lines, can anyone recommend a proportioning valve to use for the rear brakes? I am concerned about being able to attach the valve to new VW hard brake lines. Any ideas will be helpful?
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Mark 1972 Super 
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#2
November 25th 2007, 21:53
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Wilwood makes some nice quality proportional valves, could try them?
Alex
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Alex Olaverri Sales Associate for Bug@5-Speed (US) Email: Bugat5speed@yahoo.com Tele: 973 204-5463
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#3
November 26th 2007, 08:26
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You'll have to do some adapting - the Wilwood (and other aftermarket) valves are 1/8NPT fitting, while the VW lines use metric bubble flare. Depending on where you want to mount the valve you may have to install some new metric hard lines - or else try and splice it into an existing line?
CNC and others make the metric to NPT adapter fittings. http://cncbrakes.com/ Jeff
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#5
November 26th 2007, 10:56
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Quote:
I wonder if the proportioning valve should be higher than the master cylinder, and then install a bleeder by the valve? Any thoughts? Thanks again for your help!
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Mark 1972 Super
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#6
November 26th 2007, 12:36
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I'd mount the prop valve as low as possible, then plumb a new short line to the rear T fitting. Then run a new slightly shorter (than stock) line to the front. If you're running a VW pedal assembly and mastercylinder, I'd try to stick with all VW stuff/metric fittings as much as possible. The more connections/adapters, the more chances of a leak!
I've seen generic bubble flare lines of many various lengths (but can't remember where at the moment?), so you could just make up your own system. I'd also plan on one of these - pressure bleeder: http://www.motiveproducts.com/02bleeders.html Too much fight'n and cuss'n to bleed a new (dry) system and get all the air out! BTDT!  Jeff
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#7
November 27th 2007, 19:59
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Speaking from recent experience, if you just cut the stock VW line, you can re-flare it for the double-flare 1/8th". I can't guarantee this, but I think if you get a Wilwood brake proportioning valve and a couple of nipples, you can just cut out the stock line where you want the valve, double-flare the ends, and bolt that up to the valve. Then you'll have hybrid lines, half bubble metric, half 1/8th NPT. I used the stock VW lines to tie into the steel braided cables that are meant for VW Jetta, and the other end I did to attach to a standard T. The only think that might be a problem for you is that I would want my valve within arms reach, and unless you can pull any excess, the valve would then be low where the stock line runs.
Jason
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If I could just get paid for my sleepless nights.... 1960 VW Bug UBRDUB Walkaround 1st Drag Run Dyno Run Oval Ragster-'57 Rag/'04 Boxster S
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#8
November 28th 2007, 05:41
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Quote:
 Summit has real nice Tilton brake bias proportioning valves in stock metric 10mmx1.0 size). I got one of these: 
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#9
November 28th 2007, 18:15
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That looks great Wally, and easy to adjust on the fly. I always wonder how those longer levers work in daily drivers, if they get caught on stuff or not, but there's no denying the ease under way!
Jason
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If I could just get paid for my sleepless nights.... 1960 VW Bug UBRDUB Walkaround 1st Drag Run Dyno Run Oval Ragster-'57 Rag/'04 Boxster S
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#11
November 29th 2007, 19:14
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Quote:
__________________
If I could just get paid for my sleepless nights.... 1960 VW Bug UBRDUB Walkaround 1st Drag Run Dyno Run Oval Ragster-'57 Rag/'04 Boxster S
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