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I am working on a 73 240z that has been in the shed for over a decade. Cleaning and clearing brake lines and replacing calipers, cylinders all hoses and master cylinder. The proportioning valve appears to be a 260z type (4 lines) and was not allowing fluid to pass through to the rear line. Disassembled and cleaned (parts looked okay but were really gummed up) but still no go. I see some similar appearing valves on the internet listed for 280ZX but wondering if they will work?
 

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Post a photo please; lots of disinformation out there. The 240Z OEM prop valve is near the differential. I'm not sure, but you may be having problems with the shuttle valve that alerts you to a front or rear circuit failure by illuminating a light on the dash.

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Posting pictures

Still new to this site. Haven’t figured out how to post a picture!
This 73 does in fact have the proportioning valve (4 lines) mounted on the firewall and has no electric connections. Looks exactly like a 260 or 280 item.
 
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