Tdoolin18

I just replaced my rotor and rebuilt my calipers on my s14 its got 300zx rotors and calipers in the front, but anyway i was bleeding the system and i kept getting a stream of fluid no air, and the pedal just went straight to the floor. so i let it sit over night and then tried again the next day i tried bleeding it again and the fronts again i was getting a straight stream of fluid so then i went to the rear and started to make some progress, i then went to the front i was still getting a stream of fluid but the pedal started to feel a lot better so i figured it was getting better. i finished up and started it but as soon as i pressed the brake it went straight to the floor. i took it around the block quickly and the brakes sucked. so i went back in the garage and asked my friend what he thought. he didnt know so i tried getting some speed in the shop and then went as hard as i could on the brakes there was only one definitive tread mark and it was the right rear. i shut it off then tried pumping the brakes again and i there is a squeaking noise that sounds like its coming from the master cylinder. anyone know what this could be? or have a similar problem and know how to fix it?

tommytwo40hands

im sure you did this but after bleeding did you fill the reservoir back up?? a bit of a dumb question but it can sometimes be overlooked.

Tdoolin18

yea filled it back up haha. everything was going wrong that day the rotors i bought were the wrong size and the two sets of rear pads were wrong and i finally have the right ones coming but yea i checked everything over.

tommytwo40hands

lol that's just how working on cars goes..i'll look into it and see if i can help you out a little more.

xxoreolovexx

which way are the bleeders facing. I do a lot of brake swap on the s-chassis. The most common thing is people install the calipers with the bleeder screws on the bottom. Also your MC may be on its way out. With Z brakes you are doubling the amount of fluid that needs to be moved every time you push the pedal. I would get a Z brake master and go to napa and get the fitting adapters for like $1.80. This is just my.02 I have had a lot of headaches with brake upgrades.

Tdoolin18

o i think i do have them on the bottom, I'll have to check this weekend cuz im at school but, if you dont mind me askin im kinda new to diy, what would cause the problem if the blleders are on the bottom?

xxoreolovexx

air gets trapped in the top of the caliper. Just unbolt the caliper and slide it the the other side of the rotor and bleed them that way, but start from the rear right and work your way backwards to the front left. rr,lr,rf,lf. unless you have abs then its lr,rr,lf,rf.

LiveLowSilvia

not trying to rob your thread but i had a really quick question regarding Brake upgrades......searched and searched only to find nothing..

I found that J30 rotors are suppose to be 22mm according to other resources, but this week i went to the junkyard and pulled off calipers and rotors off a J30, and measured the rotors...they are 28mm like the Q45 rotors.....

Question is, CAN i use a rotor smaller than 28mm in thickness???
Will the calipers still work properly if i used a 22mm rotor???

I read that 93 Altima rotors rotors will work also to avoid redrilling J30 rotors to 4 lug, but i cant seem to find the thickness of those either to see if they are compatible or not...

any help would be appreciated

Tdoolin18

Oooo ok sweet is there a way to put the bleeder at the top or is it easier to just slide it to the other side of the caliper? And for the z master should I try to find a non abs because I don't have abs or does it not matter?

xxoreolovexx

you can mount the caliper with the bleeder screw on the bottom. for bleeding purposes take of the bolts which hold it to the knuckle and flip the caliper around so the pads are on the back side of the rotor (so the bleeder screw is facing upwards) and as far as the MC goes just search and you will find which one you need.

Tdoolin18

Not sure if I'm following what you mean. Do I switch the left and right calipers?

xxoreolovexx

NO. you unbolt them. where they sit on the front side of the rotor switch to the back just to bleed them. if you are looking at the rotor with caliper. drivers side (caliper on left move to right side and bleed, re assemble in regular position) passenger side (caliper on right side, move to left side and do the same)

japslapsilvia

OP, if ur bleeders are on the bottom....then ur calipers are switched. left and right.

switch them and bleeders will be on top....like they are suppose to be.

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xxoreolovexx

that would work also. I only do it this way because a lot of guys who bring me their cars have 2 of the same side calipers.

Tdoolin18

is it possible to mount them on the wrong sides? when i did the caliper rebuild i did it one at a time so im pretty sure i put them back the way i took them off. I feel stupid now but the caliper should be mounted on the front half of the rotor towards the front of the car right?

japslapsilvia

now i understand y u posted that...lol....


yes it is possible to mount them wrong...ie left caliper on right side of car.

you cannot put caliper on back half of rotor...there is NO way to mount it. it only faces one way.

if u bleeders are facing down caliper is on wrong side of car.

unless of course u have 2 left calipers. then one would be facing down (bleeder) and other would face up.

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xxoreolovexx

Sorry i poorly worded what i was trying to say. What i meant was to put the caliper on the back half of the rotor just to bleed it ( to keep the pistons from over extending) I have also used a 2x4 a piece of a cinder block. rotating the caliper is by far the easiest for me though.

Tdoolin18

ooo ok but havin the bleeders on the bottom wont create any problems besides being hard to bleed right?

japslapsilvia

stop being lazy.....go switch the calipers like they are suppose to be...its not that fucken hard...hello

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Tdoolin18

whoa hostility.... i was asking because i took it around the building and want to make sure i didnt fuck anything up. i am going to switch them