astroracer
06-26-2013, 08:19 AM
Quoted from Wiki:
"Diagonal split systems were used initially on American Motors (https://www.pro-touring.com/wiki/American_Motors) automobiles in the 1967 production year. The right front and left rear are served by one actuating piston while the left front and the right rear are served, exclusively, by a second actuating piston (both pistons pressurize their respective coupled lines from a single foot pedal). If either circuit fails, the other, with at least one front wheel braking (the front brakes provide most of the speed reduction) remains intact to stop the mechanically-damaged vehicle. Just before 1970, diagonally split systems had become universal for automobiles sold in the United States. This system was developed with front wheel drive cars suspension design to maintain better control and stability during a system failure.
The diameter and length of the master cylinder has a significant effect on the performance of the brake system. A larger diameter master cylinder delivers more hydraulic fluid to the caliper pistons, yet requires more brake pedal force and less brake pedal stroke to achieve a given deceleration. A smaller diameter master cylinder has the opposite effect.
A master cylinder may also use differing diameters between the two sections to allow for increased fluid volume to one set of caliper pistons or the other."
I was totally floored by this when I read about it on another forum. How many of you know this is being done and have no clue about it? How many have plumbed their brake systems through OEM MC's and Prop valves and done them Front/Rear and not diagonal as designed? What kind of problems will this cause in performance, bleeding, and longevity?
With all of the suspension design I do I have never delved into the Brake design side of the system. I was fully unaware this is being done and most of the cars we drive have split systems...
Mark
"Diagonal split systems were used initially on American Motors (https://www.pro-touring.com/wiki/American_Motors) automobiles in the 1967 production year. The right front and left rear are served by one actuating piston while the left front and the right rear are served, exclusively, by a second actuating piston (both pistons pressurize their respective coupled lines from a single foot pedal). If either circuit fails, the other, with at least one front wheel braking (the front brakes provide most of the speed reduction) remains intact to stop the mechanically-damaged vehicle. Just before 1970, diagonally split systems had become universal for automobiles sold in the United States. This system was developed with front wheel drive cars suspension design to maintain better control and stability during a system failure.
The diameter and length of the master cylinder has a significant effect on the performance of the brake system. A larger diameter master cylinder delivers more hydraulic fluid to the caliper pistons, yet requires more brake pedal force and less brake pedal stroke to achieve a given deceleration. A smaller diameter master cylinder has the opposite effect.
A master cylinder may also use differing diameters between the two sections to allow for increased fluid volume to one set of caliper pistons or the other."
I was totally floored by this when I read about it on another forum. How many of you know this is being done and have no clue about it? How many have plumbed their brake systems through OEM MC's and Prop valves and done them Front/Rear and not diagonal as designed? What kind of problems will this cause in performance, bleeding, and longevity?
With all of the suspension design I do I have never delved into the Brake design side of the system. I was fully unaware this is being done and most of the cars we drive have split systems...
Mark