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Old 04-24-2017, 08:01 PM
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njsteve njsteve is offline
Ultimate Warrior
 
Join Date: Sep 2004
Location: New Jersey
Posts: 5,044
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No, it is not. Here are some photos of the proportioning valve on my 19,000 mile 73 SD.

I actually had to remove it yesterday to send it off to Whitepost to be rebuilt. It froze up on the first drive of the year and wouldn't allow the rear brakes to release. I had to crack the bleeder screws to release the rear wheel cylinders. Not fun!
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