John Cunningham
I'm Awesome
Your exactly right about overthinking however I am doing it to understand how the wrong master cyl works so well......I am thinking once I throw a guage on the rear discs I am going to see something between 600 and 1000 pounds to the rear and around 1500 to the front. ( a sorta built in prop valve)
I found out the factory non adjustable prop valve is a bout a 60/40 bias. So if the rear discs check out to be about 1000 pounds then its about a 30% reduction in pressure like having a built in prop valve set at that pressure because of the step bore master cyl. That pressure may be perfect for average conditions. I certainly dont think there is any residual pressure so I forgot about that until I see some evidence that is different.
If your towing a large trailer it would be nice to apply more pressure to the rear brakes........The factory prop valve is not for all conditions and an empty truck bed versus a fully loaded bed would require a different bias and the factory does not compensate for that...they take a shot at average conditions and leave it alone so nobody fools with it. I believe some guys are happy with the drums because they have empty beds and it does not matter. However that all changes if you want more pressure to take advantage of the discs and loads.
But because I am old racer I want to know how pressure is hitting the rear discs. If I see something less that 600 pounds I will change the MC...if its around 1000 psi I will leave everything as is and consider itt good because who knows if you change the MC and set up a prop valve you might be matching what you already have.
It took me awhile to understand this but now I get how and why he said you dont have to change the MC..he just did not understand that its like having a prop valve without having one. Of course everybody says you need more fluid volume but I am ignoring that now for the moment too
I found out the factory non adjustable prop valve is a bout a 60/40 bias. So if the rear discs check out to be about 1000 pounds then its about a 30% reduction in pressure like having a built in prop valve set at that pressure because of the step bore master cyl. That pressure may be perfect for average conditions. I certainly dont think there is any residual pressure so I forgot about that until I see some evidence that is different.
If your towing a large trailer it would be nice to apply more pressure to the rear brakes........The factory prop valve is not for all conditions and an empty truck bed versus a fully loaded bed would require a different bias and the factory does not compensate for that...they take a shot at average conditions and leave it alone so nobody fools with it. I believe some guys are happy with the drums because they have empty beds and it does not matter. However that all changes if you want more pressure to take advantage of the discs and loads.
But because I am old racer I want to know how pressure is hitting the rear discs. If I see something less that 600 pounds I will change the MC...if its around 1000 psi I will leave everything as is and consider itt good because who knows if you change the MC and set up a prop valve you might be matching what you already have.
It took me awhile to understand this but now I get how and why he said you dont have to change the MC..he just did not understand that its like having a prop valve without having one. Of course everybody says you need more fluid volume but I am ignoring that now for the moment too