Leaky brake calipers what to do next????

[driftin8ez]

I have a 240sx with q45 brakes that i got from a junkyard. Ok this has been going on for about two weeks and it started just as the weather has gotten to around freezing temps over night. When i get up and turn my car on to warm it up the brake light stays on after i drop the ebrake. I looked at my fluid level and it was low so i filled it. Stayed ok for the rest of the week. Then anouther really cold night and the same thing. Today i finally wanted to see what was up becouse it was a cold night again. I drop the ebrake and rolled my car back to see if there were any puddles. There was a rather large one under the passenger tire and about half the size of that under the driver side tire. So i cranked the wheel one way top see what was going on back there. I got spl stainless lines which i felt for leaks along the line and at the two connections and nothing. Then i felt/looked at the brake pad on the back of the rotor. The pads that the pistons push up against and they were covered in brake fluid. I could smell it. So i looks like i have some leaky pistons. Can i rebuild the calipers or do i need new ones? I just got these over the summer so the are rather new to my possesion.

[p00t]

its not hard to replace the seals, you need the actual brake seal rebuilt kit, which includes the seals, and may or maynot come with grease, i know the nissan kit comes with the grease.

You'll also need emery cloth to polish the cylinder walls to clean them up and give the new seals a fresh start.

Its not that hard and should take a patient person a whole evening to complete. FSM is recommended so you know where everything goes. Rebuilding the rears are a bit harder and i might recommend rebuilt ones instead, but fronts are easy.

[Q45tech]

Fronts have 2 pistons each vs rear single so time accordingly.

[driftin8ez]

emery cloth?? is there a grit count like sand paper? do i need to polish the pistons as well?

[p00t]

your not supposed to polish the pistons because they are coated with some sort of metal coating and you could weaken it and make it flake off by sanding/polishing it.

emery cloth comes in different grits, you should use a fine grit, since your only lightly polishing the cylinder wall, try not to reshape it and create a nice paperweight.

[driftin8ez]

all done. Man was it a pita to get the pistons over the dust boots when putting back together.