Ate super blue, compatibility issues?

[vraned]

Anybody else running this stuff in their brake lines? Brand new rear calipers started leaking (pouring) Ate Super Blue like crazy when I started to pressure bleed the system. Bleed ports are closed. Other components seem fine. Are there different seal materials used interchangeably in these hydraulic systems that may not be compatible with this particular DOT 4 fluid?

 

[61porsche]

Blue with 4 yes. Something else is up if you put new calipers on and they immeadiatly started pouring. So much for quality control.

ATE says compatible with 3, 4, and 5. But I wouldn't do silicone.

 

[Sven]

Are both rear calipers doing the same thing? Are they rebuilt calipers or new? Possible things that come to mind:

1. Maybe the 'O' rings between caliper halves were left out?

2. Rotors too thin, and hence pistons coming out too far? Does not seem likely - just guessing.

3. Hard line threads leaking.

4. Dried out piston seals (really old new part?)

Pull one the calipers off the hub so you can see where it is leaking. Lift the inside edge of the dust covers so see if there is fluid build up from leaking pistons.

 

[AndyM]

I've run it for years with no problems at all. Something else must be amiss.

 

[vraned]

Thanks guys. Just needed a sanity check on the fluid. Something is definitely awry. Looks like the piston seals are either missing or faulty on the rear calipers. The fronts, master, and clutch slave, all done by the same sleeve/rebuilder, are fine. They must have had a fire drill while doing the rears.