Does anyone have experience of rebuilding their Daytona brake regulation valves?

I asked the same about a Dino proportioning valve to a brake parts pro rebuilder, Karps.

He said, toss everything out from the inside, they really don't do anything.
Haven't tried yet, but it would not be a difficult experiment on a nice long deserted road.

On racing cars, we used a cockpit mounted proportioning valve, maybe you can put one
under the car, adjust it to panic braking mode, and be done with it.

Regards, Alberto

 

Alberto, I've rebuilt them on several cars.
And they do have a purpose and actually do something.
Besides, if I'm not mistaken, Ronny (Karp) or Jeff (took over after Ron retired) have never driven a Daytona, with or without brake pressure balance valves and likely not a Dino either.
I've known Ron & Jeff for decades and done fair amount of business with both.

 

Timo you are quite right, but have you ever tried a car with the valve emptied out?
You are most likely right, neither Karp drove a car, but maybe they did?

PS. I sent you 2 photos of the headlight switch, one in the car, the second, the one I have.
Numbers are the same.

Regards, Alberto

 

Captain, you have very valid points as Timo does also.
Try calling Karps, and get a feel.
Let us know.

Regards, Alberto

 

Observation: It appears we might be discussing two different components, the proportioning valve, which is located below master cylinder in the engine bay and two manually adjustable pressure regulating valves located under the car, above the transaxle.

To my (limited and obviously uneducated) understanding, a proportioning valve in the case of Daytona is intended to (automatically) control or maintain equal pressure balance between two separate (upper & lower) full circuits Daytona braking system is made with, while the two regulator valves are intended to allow front/rear balance to be manually adjusted/set individually for each of the two (upper & lower) circuits.

Alberto,
I haven’t driven any car or more specifically any Daytona with proportioning or pressure regulator valves "empty" or completely removed, but have experimented with different adjustments for latter in few cars, hence my long ago request/search (which some here may recall) about finding a facility or a shop with brake testing dyno (common in where I grew up, but nobody around here has never even heard of them). I’ve since devised a somewhat rudimentary methods and equipment to test and adjust them accordingly without a need for multiple road tests.
And basically, adjustments on them do make a difference.

Captain,
I can look into my notes and stock of spare parts, but it'll like be next week at earliest. IIFC, no instructions or parts indicated in any of the factory manuals.

 

got some
I'll dig them out tomorrow and send you pics

 

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those looks the same as from fiat 124 spider
what is the distance between the 2 holes?

 

220 and 305