Q45 Brake Upgrade!!!

[homeslicej2]

The J30 rotors arent quite as thick, this means they can hold less thermal energy, making them not as efficient. Its a minuscule difference though.

double post ftw. I was under the impression that the J30 and Q45 rotors were the same part. Whenever I go to a parts store (advance, autozone, oreilly's, etc.) they have the same part #.

[got chub]

Infiniti J30 1990-1994 280mm x 22mm Rotor

Infiniti Q45 1990-1996 (G50) 280mm x 28mm Rotor

[EviL inside]

the J30 rotors are in fact thinner. i've had them sitting side by side and could SEE the difference without a micrometer. i've sold a few sets of Q45 brakes on ebay, i get them from the junkyard, blast them, paint them, and rebuild them. the rebuild kits are like $5 from autozone, and it's easy. the J30 calipers are slightly different, but just in the slider pins and a couple small details, but the piston diameter and pad size are identical.

advance auto parts has the speed bleeders on their website for .95 each, autozone sells the pair for $9. i got a friendly autozoner to price match them for me, and got a pair for $1.90. thinking about ordering a bunch of them and reselling on ebay, i don't know if advance's price is a mistake.

[EviL inside]

Hahahaha, as did I.

I wonder if they will catch the fact that they are attempting to re-man the wrong calipers

i did the same thing when i did an upgrade on my z, turned in the 2-piston non-floating caliper as a core for the toyota 4X4 4-piston calipers. i've done it on 3 cars and noone has said a thing. they are MUCH smaller, no confusing the 2.

[homeslicej2]

chub, can you check on the sizes of 1993-1997 J30 rotors (or 1995-1997). I was under the impression that 90-96 Q45 and 93-97 J30 rotors where the same.

[got chub]

chub, can you check on the sizes of 1993-1997 J30 rotors (or 1995-1997). I was under the impression that 90-96 Q45 and 93-97 J30 rotors where the same.

they are the same

advance auto parts has the speed bleeders on their website for .95 each, autozone sells the pair for $9. i got a friendly autozoner to price match them for me, and got a pair for $1.90. thinking about ordering a bunch of them and reselling on ebay, i don't know if advance's price is a mistake.

the price actually went down. i saw them for .23 cents and asked how many were left in the US. i ordered all remaining speed bleeders
Modified by got_chub at 9:47 AM 9/8/2008

[homeslicej2]

they are the same

That's what I thought, bc the J30 was only sold as 1993-1997 year models before the I30 replaced it.

[Dittoz7]

So....Which Is Better?J30 Or Q45

You Guys Got Me Confused, When You Started To Throw Numbers At Me.

It Sounds Like A Nicer/Cheaper Option Then The Z Brakes.If I Figure It Out, It's Something Defiantly Going On My Car.

[spooled240]

Q45's are better as they use a slightly bigger caliper and thicker rotors, which are more resistant to brake fade.

I have q45 brakes on my s14 also and braking feels a lot easier and stronger.

Another thing to consider with the q45 brakes is that they use the same brake lines as our stock calipers so there will be no need to use conversion lines like the z32 brakes require. Just food for thought since these conversion lines are like 40-50 bucks for the fronts.

It is basically a "plug and play" upgrade, the one thing that will take the most time is cutting or removing the dust shields to make room for the larger rotor.

Here's some pics of when I did my upgrade, notice how much larger the rotors are.BEFOREAFTERThis is all you need to run these brakes on your car. Modification to backing plates are required.

hope this helps

The only drawback to these brakes are the performance pad availability, I do believe you can get hawk hps pads for these calipers though.

[got chub]

q45 stop tech rotors and hawk HPS padshttp://www.zeckhausen.com/Infiniti/Q45_gen1.htm

endless q45/j30 padshttp://www.upgrademotoring.com...i.htm

EBC, endless, hawk q45 pads & rotora, EBC, Powerslot rotorshttp://www.horsepowerfreaks.co..._Pads

there are plenty of good performance options you just have to know where to look. i have well over 300 website for 240sx, 300zx, j30, q45, g35,350z and m35 performance parts. just about anything i need from brakes, motor, suspension anything

[midnightouge]

Infiniti J30 1990-1994 280mm x 22mm Rotor

Infiniti Q45 1990-1996 (G50) 280mm x 28mm Rotor

Are you sure about that? Last time i checked they were exactly the same thing.

[spooled240]

q45 stop tech rotors and hawk HPS padshttp://www.zeckhausen.com/Infiniti/Q45_gen1.htm

endless q45/j30 padshttp://www.upgrademotoring.com...i.htm

EBC, endless, hawk q45 pads & rotora, EBC, Powerslot rotorshttp://www.horsepowerfreaks.co..._Pads

there are plenty of good performance options you just have to know where to look. i have well over 300 website for 240sx, 300zx, j30, q45, g35,350z and m35 performance parts. just about anything i need from brakes, motor, suspension anything

sweet thanks

[got chub]

yes i am sure those number are correct. those are for the front. iirc the rear are 12mm or 18mm which is still good compared to the 9mm the 240 comes stock with

[White Comet]

chub is def right about the sizes and props for the links for parts

[homeslicej2]

You guys are killing me. Stop with the mis-information. The J30 was made from 1992-1997, but was sold as 1993-1997 year models (all made in 1992 were sold as 1993 models). It replaced the M30 model; the J30 was not produced for 1990, 91, or 92 year models (according to NICO and Infiniti parts). Chub, you said in a previous post after I first mentioned they used the same rotors that

they are the same

I thought you were acknowledging the fact that the J30 and 90-96 Q45 use the same front rotors, but I guess you were saying that your original post was correct. To put this to rest, I called the parts dept. of Nalley Infiniti of Marietta and was told that the 93-97 J30 and the 90-96 Q45 used the same front rotors I was given the same part # for each 40206-AG020. I asked, "do these models use the same front rotors?" and was told yes. I asked what year model he used to do the search, I was told that the same front rotor was used for both cars through their entire model life. The Q45 has slightly larger calipers, but they share the exact same front rotor with the J30. The J30 calipers use the same style brake line fittings as the 240sx/Q45 as well.

[got chub]

90-92 Q45 use the same rotor as the J30 all years but in 92 the Q had a vin split and the Q45 got the larger rotors for 92.5-96 model years. so yes my numbers are correct(Q yr was early) and my previous post was also correct.

i calledinfiniti parts USA 1.888216.5328lake norman infiniti 1.888.496.3184advanced auto (national wearhouse) 1.877.808.0698

all gave me the same answer for the split vin and same year

[240lookis]

wow! this seems like a really good upgrade for the price. i might have to look for these when i go to the junkyard

[homeslicej2]

90-92 Q45 use the same rotor as the J30 all years but in 92 the Q had a vin split and the Q45 got the larger rotors for 92.5-96 model years. so yes my numbers are correct(Q yr was early) and my previous post was also correct.

i calledinfiniti parts USA 1.888216.5328lake norman infiniti 1.888.496.3184advanced auto (national wearhouse) 1.877.808.0698

all gave me the same answer for the split vin and same year

Well, I guess Infiniti doesn't know for sure either, bc I was told by my Infiniti dealer that they were the same for both cars for each's entire model life. I also use the thicker rotors for the Q45 and have no problems (no issues with getting caliper on, no dragging, etc.). It's interesting that advanced auto said they are different, bc on their site they list the same part number for the front rotors for all years of Q45 and J30. I used Infiniti parts USA's site and saw that they list a different front rotor for the Q45's with active suspension versus the rest of the Q45's, I don't know.

[Ohio_S13]

Are the 03 sentra SER rotors the same size as the Q45?

[CRIPES]

You guys are forgetting about the J30's, its the same thing besides the brackets.Best $50 i've spent

same i've got on mine.... already locked them up twice and it was very very easy. very hard to fade as well

[CRIPES]

The J30 rotors arent quite as thick, this means they can hold less thermal energy, making them not as efficient. Its a minuscule difference though.

very minuscule indeed. mine never give up.

i've seen the J30 and Q side by side and you can't tell the difference in size by eye balling. it's retarded to even argue the sizes between the two.

[wingFeather]

I believe my car has Q45 calipers with Altima rotors up front.

They obviously work better than stock, but I find that they grip too much... causing the front wheels to lock under hard braking.

Q45 brake upgade is nice but make sure you upgrade your pads in the back or you will lock up very easy.

Brakes systems are made to have a certain balance. throwing off that balance will upset the car when driving hard.

+1 I ma in this situation right now
Modified by wingFeather at 2:25 PM 9/11/2008

[Ohio_S13]

Does anybody know for sure if the 03 Sentra SER rotors are the same size or close to the same size as the Q45's? I guess I am gonna have to go to the parts store .

[Pento240sx]

the price actually went down. i saw them for .23 cents and asked how many were left in the US. i ordered all remaining speed bleeders

Modified by got_chub at 9:47 AM 9/8/2008

Hey Can I Have One Please

[got chub]

why dont you call infiniti usa the numbers are listed in this thread

[night240]

time to get me some q45 brakes.

[got chub]

Hey Can I Have One Please

yeah $5 and you can have a set or $10 for the entire cars worth

[White Comet]

yeah $5 and you can have a set or $10 for the entire cars worth

really? where do i paypal to?

[got chub]

really? where do i paypal to?

ok speed bleeders

$10+ $2 shipping for 4 bleeder screws

i don't want to sell on someone else thread so just email me for details and paypal address(same as email)
Modified by got_chub at 12:12 PM 9/11/2008

[mig240sx]

This is all you need to run these brakes on your car. Modification to backing plates are required.

What modification do you need? How is it done? Thanks.