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Originally Posted by JFryauff
Other Rabbits (most through 1979 and some 1980 and possibly 1981 diesel Rabbits and Rabbit Convertibles) have a "load sensing brake pressure regulator" at the front of the left rear suspension.
If you have the load sensing regulator, there are a few things to check and/or replace. Make sure the spring that goes from the pin on the rear suspension piece to the lever on the regulator itself is good. It's common for the spring to rust through and break. If it breaks, the regulator senses no load at all and will basically turn off the rear brakes entirely. I'd just replace that spring if you have that setup. There's also a pair of inline "residual pressure valves" in the rear lines that tend to fail and cause minor rear brake issues (usually a slightly longer pedal than you really want, but with good brake operation at the bottom). If your pedal has a lot of dead space at the top, it's worth changing out the residual pressure valves.
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I've seen this posted in other places on the internet as well, and I found it in ETKA. What's odd is that on the tons of cars I've taken apart, and the 15 or so MK1s I've owned, I've never actually seen one. I need to go out in the yard and rummage through some cars until I find one and get to know this system better, it might be of some use to me.
Seems to be in german production cars with power brakes and early style master cylinders. My '78 German car has manual brakes which is why it didn't have one and the 16v scirocco and multiple cabriolets I've taken apart had later style master cylinders with prop valves up front. US production cars never had them... so somehow I've just managed to avoid this one part.
