brake pedal Drop

[EVL240]

heyy its my 1st time postin here, im likin what i see.

figured id kick it off with a question.

In my 90 240sx when i push the brakes, sometimes there right there and solid, then sometimes i can feel the pedal fade down to the floor, then however long later it feels like, the brakes are back to normal. ive checked my fluid and my lines, thinking a leak is the problem... but my fluid level isnt dropping, and my lines are not leaking. is it possible my master cyl. is toast?

Oh yes, i forgot to add, this is also the 240 hatch, base model, with the KA24e if that makes a difference.

thanks for your help, chris.

[rb25drag]

Have you tried bleeding the brake system?

If not try bleeding the system you prob have air somewere in the lines.

If that still doesnt work make sure you are getting a good vacuum for the booster.

More than likely you have air in the lines tho.