92 Explorer Brake Loss

[jhead678]

After bleeding the brakes I get firm pedal for about 500mi. over the next 250 miles I slowly lose pedal. Rebleeding system starts it all over. Since I'm putting about 500mi a week on the truck this is a big problem for me.

92 sport with New Master Cylinder, Front Calipers, Rear Wheel Cylinders. Not losing fluid.

 

[Billy177]

make sure all the fittings are tight and the resivor is firmly seated

 

[marragtop]

Do the brakes pump up at all?

 

[jhead678]

Fittings are tight but reservoir seems to slide around a little in the bushings. No leaking around them though.

Pedal pumps up a little pressure, but not much.

 

[Billy177]

are you using the correct brake fluid i belive it is dot3

 

[jhead678]

Dot 3 it is. At a loss. I think I'm going to just recheck the system from scratch again.