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Originally Posted by joshhol
Hello,
I've just completed rebuilding the front ATE/Teves calipers on the 76 300D, or at least I hope so. 
Some concerns:
1. Getting the heat shield down far enough. The book says to get the edge of the heat shield at least .1mm below the surface of the elevation on the piston. I've managed to "beat" the thing down to about flush (more like pressing with the old pads/ washers and a socket and clamp, etc.) What is the reasoning behind this, is it a squeal issue? Without the special tool, I'm about to give up and put it on the car unless anyone has a really good idea.
2. I used "Raybestos Hydraulic Brake Cylinder Assembly Fluid" sparingly to lube the parts for assembly. Suppose I should'a just used brake fluid. 
3. There were some rust spots and surface imperfections in the bore. Not totally rusted out or anything, even the book says minor imperfections can be cleaned. (I used 1, and 00 steel wool). I didn't really have a problem with leaks or sticking before so I hope I can just put them back in service.
DOT 3 or 4 in this car? I bought the ATE DOT4 off fastlane, but the brake res cap says use DOT 3. |
1. When I did the Bendix calipers, I had the exact same problem. I could not get the heat shield below the piston, no matter how much I tried. Without the special tool, it seems hopeless. I installed them and they appeared to have no issues running flush.
2. Cannot comment on the Raybestos fluid. No knowledge of what it is.
3. If you have cleaned up the bore carefully with steel wool, and there are no raised areas, you will be fine. Pay particular care to the area outside the seal. This area can get a bit corroded and cause the steel to be raised a bit. This will cause the piston to contact this raised area during the installation of the piston and it will give you fits. I had to carefully file this area using a fine file to get the rust removed.
However, if the piston has any rust anywhere on the outside surface that contacts the seal, you must replace it.
DOT 4 is the best fluid you can buy now. At the time of manufacture of the vehicle, DOT 3 was the only thing available
AFAIK.