VW Golf MKII Brake Proportioning Valve fix OR rebuild OR replace OR o-ring OR repair OR diagram OR half-cut OR.......

Did you type the title of this post into Google only to find no instructions for rebuilding your leaking VW brake proportioning valve? I did! Well, rest assured, you don't have to spend $140+ for a new one. You can just clean it out and put new o-rings in it. Mine was leaking in the middle, where there is an o-ring band around it. I assumed that this is where the whole thing screwed apart, but I found that the o-ring actually just covered a tiny tiny hole. It screws apart from the top and you just yank that brass plunger piece out with some needle-nose pliers. The top of the brass plunger has what looks like a screw driver slot, but trust me, turning it with a screw driver does nothing. Pull it out, clean it up, get new o-rings, put it back together, fixed. My o-rings looked fine at first glance, but after further investigation I saw tiny striations that were letting the brake fluid by.

P.S. If you find yourself replacing a starter on a 3rd generation Jetta (or probably others), support the engine with a jack or some stands... those clever Germans thought it was a hoot to use the bolts from the starter to also hold the engine to the engine mount.



Ryan Albright said... August 17, 2013 at 12:54 PM  

Thanks for the info! And yea, as for the starter my mk2 has it using the same engine mount bolts too. Not sure if its the same on mk1s.

Cory Anderson said... February 10, 2017 at 12:48 AM  

I think this is an i nformative post and it is very useful and knowledgeable. therefore, I would like to thank you for the efforts you have made in writing this article.
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Unknown said... April 15, 2020 at 10:56 PM  

Do you have partnumbers for the o-rings needed for the rebuild? Thank you

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