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PostPosted: September 24, 2016, 2:04 pm 
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Mid-Engined Maniac

Joined: April 23, 2006, 8:26 pm
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Location: SoCal
Bent Wrench wrote:
My machinist friend is convinced that Wilwood makes "show" brakes.

He uses a lot of bad words when I take him Wilwood parts to work on.

So making good looking brakes is a bad thing and this is based on... what?

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PostPosted: September 24, 2016, 2:27 pm 
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Joined: October 23, 2010, 2:40 am
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BBlue wrote:
Tom, I read sections of the book years ago. As I recall, he described three types of valves, constant percent reduction, pressure limiting and the type you describe. Wilwood describes their valve as giving up to 60% reduction of pressure. That's all. To me, that sounds like a constant reduction valve, the least desirable type. I suppose we will never know, unless some curious soul sets up a test rig, measuring input and out pit pressures across a wide range of pressure.
Bill, here's Tilton's explanation. It's consistent with Puhn's text:

Hmm, for some reason I can't copy/paste the url. but if you go to Tiltonracing.com, under the Technical tab, click on Installation Instructions, and under Brake Accessories you'll find a line item for Brake Proportioning Valve that will bring up a pdf.

Hope that helps.

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PostPosted: September 24, 2016, 4:13 pm 
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Joined: February 28, 2009, 11:09 pm
Posts: 1263
Location: Connersville, Indiana
seattletom wrote:
BBlue wrote:
Tom, I read sections of the book years ago. As I recall, he described three types of valves, constant percent reduction, pressure limiting and the type you describe. Wilwood describes their valve as giving up to 60% reduction of pressure. That's all. To me, that sounds like a constant reduction valve, the least desirable type. I suppose we will never know, unless some curious soul sets up a test rig, measuring input and out pit pressures across a wide range of pressure.
Bill, here's Tilton's explanation. It's consistent with Puhn's text:

Hmm, for some reason I can't copy/paste the url. but if you go to Tiltonracing.com, under the Technical tab, click on Installation Instructions, and under Brake Accessories you'll find a line item for Brake Proportioning Valve that will bring up a pdf.

Hope that helps.

Thanks Tom, I hope the Wilwood item is the that type.

Bill


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PostPosted: September 25, 2016, 2:14 pm 
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Joined: April 1, 2010, 10:26 am
Posts: 338
I swapped the calipers yesterday and I think it's going to work out perfect. It feels a lot better and I could get the fronts to lock, pedal pressure it a little greater but it was pretty light to start with. The next track day will tell because multiple +100 mph stops and tough to re-create on the street. But I love the Nocost solution to the problem.,

Thanks for everyone's help

Graham


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