i have a slow internal leak in my master cylinder and nothign apears to be wrong its newly rebuilt and everything... rubbers are flawless and cylender appears to be as well but for some reson fluid bypases the piston after about a week or so... are there better grade(thicker) fluids that would prevent this.. im doubting but hey i dont know....

 

um.. you might wanna rephrase your question, its pretty confusing to read. but from what I gather, your master's got an internal leak, so it wont be visable from the outside - it just doesnt hold pressure when you have the clutch pushed in.

as far as thicker fluids, they dont really sell thicker brake/clutch fluid. the obvious and best fix would be just to buy a new/rebuilt clutch master. they cost about $65 from mazdatrix. the cheaper option would be to rebuild it again. the kit is about $25. http://mazdatrix.com/f-hydral.htm

also, are you absolutely sure its the master? is there any fluid in the slave if you pull back the rubber boot?

 

75-90w that should thicken things up nicely, i think anything thicker than DOT3 would cause the clutch pedal to be to hard

 

ya sory about that my brain id unorganized and what not. ya ive tore the master apart and it has fluid on both sides of the piston. the slave is fine no leaks anywhere. ill probly fork out 65 bucks for a whole new unit... i dont know why replacing the guts didnt work for me very long.