miliman13
10+ Year Contributor
- 1,957
- 276
- Jan 1, 2011
-
tampa,
Florida
This at first was meant to be a how to fix your valve article...
But i failed. So i wanted to show my results and data.
I did a NON-ABS P-VALVE swap, unfortunately it was a bad valve.
Non of the rear brakes bleed, so i checked the valve and the ports for the rear were dry.
I soaked it in PB Blaster for 24hrs and nothing...
I destroyed it and found what i believe to be the cause... HARD braking may have damaged this valve before.
I also drilled into a ABS Valve for comparison and found that the aluminum piston inside was in better condition the other piston from the NON- abs one.
In my search i only saw illustrations, so i wanted to show the inner workings for members and visitors.
This is my illustration :
The force of fluid is what pushes the piston forward and causes it to seal a small chamber where the rear brakes get their fluid from.
As you can see the fronts are unaffected by this motion. Which is essentially what this valves is supposed to do.
But the piston is made of a weak metal and may bend itself causing it to not return to position with the help of the spring.
Below is a view of the chamber i mentioned that leads to the rear.
Here is a view of the front brakes
And this is the view from the Master see how they in essence share the same galley
Below is the inner working of the valve.
And the one on the left is from a ABS which was working just fine. The one on the right is from the non ABS which was not working. See the difference, so even though i cannot with certainty say what the cause was it's possible to believe that extreme hard braking may have lead to this.
But i failed. So i wanted to show my results and data.
I did a NON-ABS P-VALVE swap, unfortunately it was a bad valve.
Non of the rear brakes bleed, so i checked the valve and the ports for the rear were dry.
I soaked it in PB Blaster for 24hrs and nothing...
I destroyed it and found what i believe to be the cause... HARD braking may have damaged this valve before.
I also drilled into a ABS Valve for comparison and found that the aluminum piston inside was in better condition the other piston from the NON- abs one.
In my search i only saw illustrations, so i wanted to show the inner workings for members and visitors.
This is my illustration :
You must be logged in to view this image or video.
The force of fluid is what pushes the piston forward and causes it to seal a small chamber where the rear brakes get their fluid from.
As you can see the fronts are unaffected by this motion. Which is essentially what this valves is supposed to do.
But the piston is made of a weak metal and may bend itself causing it to not return to position with the help of the spring.
Below is a view of the chamber i mentioned that leads to the rear.
You must be logged in to view this image or video.
Here is a view of the front brakes
You must be logged in to view this image or video.
And this is the view from the Master see how they in essence share the same galley
You must be logged in to view this image or video.
Below is the inner working of the valve.
You must be logged in to view this image or video.
And the one on the left is from a ABS which was working just fine. The one on the right is from the non ABS which was not working. See the difference, so even though i cannot with certainty say what the cause was it's possible to believe that extreme hard braking may have lead to this.
You must be logged in to view this image or video.
Last edited: