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Old 12-20-2013, 03:08 PM   #1
bamakodaker
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brake proportioning valve

I specifically want to know if the 2005 Ford Focus 2.0 has a brake proportioning valve. The answer may differ for each year, model, engine type, etc.

I'm chasing problem of one side front brakes dragging.

Thanks for any thoughts or suggestions.

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Old 12-21-2013, 06:56 AM   #2
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From what I can tell, the Focus uses a split-X brake system. The MC actuates 2 circuits - Front Left, Right Rear, and Front Right, Left Rear. There is a PCRV in the legs serving the rear brakes. See http://www.underhoodservice.com/Arti...ord_focus.aspx Since this valve serves to modulate pressure to the rears, it probably isn't the cause of your dragging front.

It would seem to me that the problem is probably at the caliper. Have you checked for seized sliders?

Good luck.
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Old 12-21-2013, 10:43 PM   #3
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The PCRV is to prevent the back from locking up - - but since it is a split-X system - could the back drivers side be causing more pressure to go to the front of does it really do nothing but regulate pressure at the back?
No, I have not checked the caliper. Going to change it out Monday though.

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Old 12-22-2013, 08:06 AM   #4
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You said that your problem was with a dragging front caliper, which I interpreted as a caliper that is acting as a brake when you don't want it to. IOW, a caliper that isn't releasing. If that is what you meant, something is holding the brakes on in that corner. It could be mechanical -like stuck sliders or maybe a piston that isn't retracting - or it could be hydraulic. For it to be hydraulic, the PCRV or some other cause would be preventing the release of pressure from the dragging corner. I have seen brake MCs with blocked relief/return ports cause brakes to not release/drag, but w/ the split-X system that problem would cause dragging at diagonal corners. I don't see how the PCRV could affect the release on one corner.

My 2 cents is on a problem at the caliper. Good luck.
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