Alright, so it comes time for me to put everything on my s13, so I first take off the stock calipers and install the Z rotors and calipers. After that, I installed all the lines.
Then I bled the system quite thoroughly, in the order the FSM says. Double checked to see if all the lines were tightened, and began checking for leaks. There were none.
Bled the system again, knowing that because we’ve takin off all the lines, there must be a lot of air inside.
Here is the Problem:
Upon start up, when pushing the pedal down a few times, there was a very loud and noticable hissing sound coming from it.
It felt nice at first, but as soon as I started to drive it out of my shop, and applied the brakes, the pedal went straight to the floor. It wasnt grabbing at all.
Checked for leaks again, and there were none.
I talked to a caliper rebuilder who personally has a 300zx and he said that it could be the seals between the two halfs of the caliper that were either broken or not torqued properly.
I sent it out to him and had them rebuilt, and when we put everything back together again, same problem, only this time it made a little difference. Pedal was still going to the floor and not driveable.
If there is anything that I missed, or I should have done, can you let me know.
If you can help me out as to what the problem is, it would be greatly appreciated.
the hissing sound is coming from the booster or MC for sure.
I was just wondering, if that would mean that it is too weak to pressurize the system for the bigger brakes?
sounds like you got a serious air pocket somewhere you gotta bleed those breaks better. i had to bleed mine for about 40 mins before it was fine. if the calipers were rebuilt and you got no leaks anywhere then it must be air pockets and if the old breaks worked before that mean the MC is fine.
when bleeding dont just hit the pedal if there are air bubbles in the system youll be able to hear them travel through as you bleed the brakes i had one air bubble that took me like 30 mins to move from the front to the bleeder nipple on the rear caliper.
keep trying if nogo it maybe the MC but lets hope its the air bubbles
If your brakes were fine before, i doubt its the MC. When you installed yoru calipers did you align them so the bleeder screw is on the top or the bottom? They need to be on the top… this might be your problem.
Before i installed the Z brakes, there was a hissing noise as well but you could only hear it inside the car, but with the new brakes installed, its so loud you can hear it outside.