help! 5 lug now no brakes!!!!

[clovers525e]

Ok, before anyone says anything, yes I’ve bleed my brakes 20 thousand times.

Now, here is what’s going on. I swapped out my rear rotors (s14), pads (s14) and hubs for stock s14 stuff, swapped out the front spindles (s14), ball joints (s14), rotors (j30) and calipers (j30). Initially I left the rear calipers the way they were and didn’t touch them. I did how ever pop a piston out on accident when I tried to set one of the brakes and then noticed a small pin size hole in the caliper boot.

When I got everything back together the brake pressure was nothing so we started bleeding. We used around half a large bottle of brake fluid from advanced. After some time we noticed that the brake pedal would build pressure but as soon as it was left to rest in the up position, the pressure would drop quickly. We only bled the fronts initially because they where the only ones removed. After we talked about the hole for some time we considered the possibility that air was entering the system there. So we replaced both rear calipers with s14 ones, still nothing.

My question is, is the stock s13 master cylinder large enough to power the new and larger front calipers (j30)? Has anyone herded of a problem like this, where the system must have been properly bled but the system would not hold pressure? There are absolutely no visible leaks of any kind and care was taken to not allow any air into the master cylinder while bleeding.

Also on a side not, it seems like the system will build much more pressure while bleeding when the pedal is pressed from say half way down to the floor instead of letting it come all the way up to where it normally rests.

The way it feels today is easy to press down to the floor, a slight resistance but nothing big at all.

[numbnuts240]

are all the calipers installed with the bleeders on top?

[clovers525e]

good question, i'll go check now!

i also just swaped the front calipers back out for the old ones and gravity bled them (because all my friends are tired of helping me work on my car )and what do you know, works perfect.

so atleast i have options now, i could always go redrill my front rotors for 5 lug and hold off on the j30 brakes.

but i think i'm going to try gravity bleeding the j30 calipers while there still off the car so i can rotate them, tap out any bubbles, and make sure there is no air. i beleave the bleeder is on the bottom and that would make sence for it not to work

my parents where all ready to by me a new/larger master cylinder too, if i get it fixed i should put some air in the lines so i can get one.

[ILoveMyRHS13]

J30 calipers work fine with a stock S13 BMC. However, they feel MUCH better with a 1989 300ZX Twin Turbo BMC.

BTW, I have J30 fronts with Z31 BMC, I also had an S13 BMC with them at first, but then upgraded.

Try buying caliper rebuild kits in the front and rebuilding them, they could be siezed open or something. Then bleed ALL of the calipers.

Another problem that I ran into is my stock BMC cooked all of the seals because the brake fluid got so hot and when I bled them, the seals disintegrated into the fluid and killed the BMC.
Modified by ILoveMyRHS13 at 12:51 PM 8/3/2009

[YuNg1's_240sx]

hey was the BMC upgrade to the z31 that much of a difference?!I have j30 calipers, rotors and brake pads.but i am getting reman. calipers from autozone, and i was wondering if I should just get the BMC from the 89 Turbo Z's. What else is neccessary for the swap?