A while ago, I had a spongy pedal and a real sluggish stop. So I looked under the hood and realized the brake fluid was very low. So I filled it and was on my way. I got home and the fluid was gone again. So, it came to be bad wheel cylinders. ....So those were replaced. I think I got all the air out of the system...but I think the fluid is still disappearing. Any ideas?

 

Then it's still leaking...?

The only reason I had to replace my drum cylinders was because my brake lines were leaking and they were so rusted I couldn't get them out of the cylinders.

Just check all the lines for any possible leaks.

 

No stains in the driveway or fluids on the inside of the tires?

How did you bleed it? Someone pumping the pedal or did you do gravity bleeding?

 

I pedal pumped. The fluid in the reservoir always comes back and sits right at or a tad above the add line. The pedal is pretty firm. Is that where the fluid should be?

 

try searching brake booster?

 

would it have anything to do with the booster?