300zx Brakes

[RED_DET]

Will they work on the J30?

[driverdriver]

The rotors for the J30 are manufactured differently-they're made to stop a heavier vehicle than the 300zx. Apart from that, I think a lot of the basics are the same.

[95-J30tt]

i've seen pics of the 300zx brakes installed on a J30 in japan, it had upgraded rims (aftermarket), i believe it had a discription too, but i wish i can read japanese.....looool

it has been done before, so it shouldnt be much of an issue, the worst case i think would be that you will need spacers for the rims, and a bracket adapter, but dont quote me on that, hope this helps

[yodawill2000]

Not sure why you would downgrade the capacity of your brakes ?If Im not mistaken the J has the same brakes as the big brother Q45 !!

Stops my J on a dime !!

[gr8scott72]

Not sure why you would downgrade the capacity of your brakes ?If Im not mistaken the J has the same brakes as the big brother Q45 !!

Stops my J on a dime !!

So you're sure that the J30's brakes are bigger than the 300's?

[ttinfinitiM30]

now correct me if im wrong.... the 300 has four piston calipers in the front and two piston calipers in the rear. as compared to the j30 having single in the rear and my guess is single mayby dual in the front. theres at least twice as many pistons. ok the 300 dose weigh less but its the clamping force that is being gained by swapping to the 300 setup. plus an option to upgrade to drilled ad slotted rotors. i dont see how more clamping force can be concidered a downgrade.

in addition to jus the calipers though u would also need to swap the master cyldr cause theres a whole lot of fluid being pushed around with that setup.

[RED_DET]

Thanks for the input guys. Yeah, 300zx brakes a down grade, I don't think so. That would be like saying if I put Brembo brakes on my G35 it would be a down grade from the 2 piston calipers I have now. The curb weight of the 300zx is 3500lbs, same for the J30. So weight of the car shouldn't be an issue either.

[gr8scott72]

I couldn't find any info on the size of the J30's front brakes. The 300z's fronts are 11" and came in a 30mm wide vented rotor and have 4 pistons. The J's fronts are 2 pistons.

The rear's of a 300 are .75" bigger (diameter) than the J's and are 2 pistons instead of the J's one large piston.

So it would be an upgrade but like said before, you would need to change out the master cylinder also to keep from having a squishy brake pedal from having 6 more pistons.

[yodawill2000]

So you're sure that the J30's brakes are bigger than the 300's?

My bad ,, just going off what DriverDriver said.He's forgotten more than I know about J's

[NismoChi]

So it would be an upgrade but like said before, you would need to change out the master cylinder also to keep from having a squishy brake pedal from having 6 more pistons.

Not ture, i have a Maxima and i up grade the brake to a 30mm iron Z32 four pistons calipers w/13 inches rotors wtih the orginal master cylinder, the break pedal feel nice and firm. Orginally the Maxima has single piston caliper on all four corner compare to 2 pistons in the front and 1 pistson in the rear on the J, if master cylinder from a Maxima can handle the extra volume, i don't see why the J can't.Ask those S13, S14 guys withe Z32 brake set up. Upgrading the master cylinder is just not necessary.The reason being it that the increase in piston area is not that much , just four bigger pistons compare to eight smaller pistons.

[J30tChumpCar]

Ok I know I just dug up a 3 yr old thread but I was looking for better /bigger front brakes.

We just returned from Sebring and let me say it was epic! Our j30 lead the race for over 2 hours, we actually had a shot but being noobs to road courses and with only one other j30 running endurance racing we had no one to ask if the stock brakes would work in a 12 hr race
The answer is almost .(when running the best pads $ will buy.)

What big rotors/calipers fit j30s?

[swimshark]

there are big brake kits being sold for 300zx that will fit on the J30.

http://www.z1motorsports.com/index.php? ... 668979c8d9

i was talking with the guys at Z1 and they said to just keep the J30 brakes. they are probably a bit better than the 300zx stock brakes. i stopped a little bit quicker than my friends 300zxTT from a 60 roll.

try super blue brake fluid. that will raise the boiling temp of the fluid and make your brakes last longer on the track. if you go bigger go with something actually bigger. you will obviously have to run a bigger diameter wheel to run the brake kits. good size to start with is 18" wheels. the bigger brake kits come with brakets and other pieces in order to make the kit straight bolt on.

also try replacing the stock brake lines with stainless steel ones. you may have to make your own.

[J30tChumpCar]

Thanks for the link.
Focus today is limited to front brakes.
Our current problem is not related to firmness, feel,fading,boiling or not stopping well.
We had the most effective brakes there, out braking anyone at will, only problem was longevity ,lost the lead in the 11th hour (12 hr event) with used up pads. Thus my search for something bigger. I am sure with more experience we will lighten up on the brakes but more can't hurt. Next event is 24 hrs.

We are using Pentosin super dot 4 with excellent results
http://www.eurosportacc.com/brake_fluid ... racing.htm

We have adapted the fog light holes for brake ducts.

Carbotech XP10 Front pads
http://www.ctbrakes.com/brake-compounds.asp
There was a super fast z31 turbo with porterfield pads they swore by, anyone have experience with those?

Currently our wheels are limited to 16 inch.

There is a rule limiting how much we can spend on aftermarket parts but any stockish swap will pass tech with no penalty.

I have never directly compared the j brakes to z32 units but was enticed by the huge 4 pot calipers and the assumption the rotors would be bigger or at least have more swept area under the pad.
Has anyone had z32 stuff sitting right next to their j30 ? Is there some other model I should be scrounging rotors off of ?

Thanks again.

[swimshark]

you could try q45 calipers and brakes. they have slightly bigger pads and the piston is bigger. they are also probably easier to get your hand on from a junkyard than z32 brakes.

its one of those things i considered upgrading or got pestered by friends to put Z brakes on but after talking with a few of the guys from Z1 Motorsports who specialize with 300zx they said to either buy a bigger brake kit or stick with the J brakes. one of them drove my car on Talladega Gran Prix Raceway and actually liked the feel of the J brakes compared to his G35 coupe.

what type of rotors are you using as well?

i got a set of cross drilled and slotted and took it on TGPR about 2 yrs ago and already had fatigue cracks after 3 months of use and 1 track day.

[J30tChumpCar]

The pedal feel and ABS on the stock brakes was really impressive even when driven way past their capacity.

We were using the used OEM rotors that came with the car, they did crackle and warp some toward the end when one driver got too aggressive and overheated them.

If we stick to stock stuff the only upgrade to the rotors will be slotted ones as to avoid the cracking you mention.

I had someone give me a used q45 rotor and pads(unknown year) , I was not impressed, the area under the pad appeared to be narrower. Perhaps I just got the wrong year to look at?

[swimshark]

yah i havent really taken a look at q45 brakes to compare. you could prolly go to the auto store and ask them for pads from different year ranges and compare them to the J30 pads in store. the slotted rotors definitely add some more bite. ive beat hard on this car and the rotors have yet to warp. there are heat swirls in the metal from them getting hot.

[jdurrty]

I found these big brakes that have infiniti logos all over them, so maybe you can pass them as oem to get pass the cost constraint. If youre not cheating, youre not trying

http://cgi.ebay.com/ebaymotors/INFINITI ... 886wt_1002

[J30tChumpCar]

WOAH , I had a little drool to mop up after all the pics.

Here is a dash cam of what our J30 is being asked to do, we were hitting 110mph and 100mph each lap with no real cool down time, average lap was 1:30.

http://www.youtube.com/watch?v=LixMWEYIg-U

[swimshark]

Sames brakes as this but these come with the brackets to bolt on

http://www.z1motorsports.com/product_in ... c0b6cea9e5

[J30tChumpCar]

Update

Those links show the solution to my brake problem except they go way over budget for both us and the rulebook, can't do em

I bought a pair of z32 300zx aluminum calipers, year unknown. I ripped the wheel off my j30 and discovered the 300ZX caliper is a bolt on, lines up perfectly with the stock j30 rotor , mount,and uses the same bolts , fits easily under the 16in wheels
I had to rework the line but its amazing how well they fit.

I will snap some pics and detail what i had to do when we do the other side.

[yodawill2000]

Are those 4 piston Calipers ?

[J30tChumpCar]

Yes Aluminum 4 piston fixed, non floating with a big NISSAN you see through the wheel.

[J30tChumpCar]

I took a quick vid to show what I am talking about.
Please excuse the low quality ..

http://www.youtube.com/watch?v=0fvvqGN6a-E

[swimshark]

i think if you get a reman set through auto zone they are the cast iron 300zx brakes. the aluminum ones are known to fail at times.

[J30tChumpCar]

Tell me more, I was just about to clean them up and get everything finalized.

[swimshark]

http://3zc.com/showthread.php?t=152464& ... t+calipers

http://3zc.com/showthread.php?t=81141&h ... t+calipers

http://3zc.com/showthread.php?t=129733& ... t+calipers

[RED_DET]

R33 GTS-T Front
Z32 Rear
Stainless steel lines
Hawk HPS Pads
ATE Super Blue fluid
Stoptech Slot/Drill Rotors

This setup works great on the J30.

[J30tChumpCar]

Thanks swimshark I reviewed the threads I see nothing that would make me think twice about running the aluminum calipers, no horror stories, no fail pics, just a bunch of speculation. We need lightweight and better heat control.

Red could you help me figure out the r33 stuff, pics or at least what the differences to the z32 calipers I have here.
Are the rear z32 brakes something really needed ? Bigger pads or just the second piston?
I foolishly missed a set at the local pick and pull, now I would need to drop some $$ to get everything.

I see all the 13 inch kits, how about a 12 inch rotor that fits with little tinkering?

[RED_DET]

R33 calipers are bigger than the z32's with a 11.65" rotor vs 11" on the z32 . You will have to use a rotor from a 97-01 Q45 and a 1mm washer between the spindle and caliper. The rear rotors are a tad thicker than the j30's and you get an additional piston. That an the appear matches the front.

[J30tChumpCar]

Thanks, I think the Q45 rotor in my vid is what you are referring to, the hat is shorter and rubbed something, I suppose I could make a spacer to use the Z32 caliper with the q45 rotor for a little more leverage.

I will look into the z32 rear brakes if time and $ present themselves