I have the 19mm early VW beetle master cylinder installed and all new brake hoses and steel lines going in. All good there. I am going to put the larger sized brake cylinders from the front in the rear as well - so it will be 22mm diameter both front and rear.
I was talking with a friend who is a VW bus guy and he mentioned that later VW busses had a brake regulator device for the rear brakes which uses an internal steel ball to sense hard braking and then directs the fluid through a spring loaded regulator. It also apparently reduces braking on the rear wheels when going downhill as well. Sounds interesting - especially with the larger rear cylinders being installed. Its sort of a mechanical version of an rear ABS system...
![Image](http://images.thesamba.com/vw/gallery/pix/673063.jpg)
![Image](http://haysvwrepair.com/wp-content/uploads/2013/06/proportioningvalve_edited-1-copy.jpg)
Here is a link to one of these devices with the best pricing I found on it - $144 USD - http://www2.cip1.com/ProductDetails.asp ... 51-612-501
This one is a "quality reproduction" which, from my experience with VW parts, can mean anything from junk to good... Apparently there is a early version (71-78) and a later version (79-92) and the early ones are suppose to be better...
There is a Canadian place which rebuilds and tests the early ones - https://www.germansupply.com/home/custo ... at=&page=1
But they are expensive - about $250 USD with the core charge.
So - I might put one of these in on my haffy - Hopefully my friend can dig one up from his stash of parts.
Any thoughts or experience with this device? I only had the earlier split window busses myself and most of them had such poor brakes locking up the rears was not a concern...