Biggest brakes for ROH

[Losiracer2]

you can also swap either NSX calipers or what I did, Acura Legend GS/LS 2 piston calipers. They use larger 42mm and 38mm pistons vs the 40mm and 36mm pistons found on the NSX.

My setup isn't ROH though, still the original HOR, but using wagon caliper brackets (25T) and wagon 25mm thick rotors.

[Jarrett]

So you finally got matching brackets?

[Losiracer2]

So you finally got matching brackets?

yeah i went back to the place i got the Reman'd Vigor calipers from and complained that one was a 28T from a Legend GS and the other was a 23T from a Accord wagon, so I go them to give me a new 25T bracket for 50% off, so it only cost me like 12 bucks. But now they both match and the pedal feels great.

[Slow]

So i checked out legend calipers, and they appear to mount in the back rather than the front, and switching sides or having the bleeder on bottom doesn't seem ideal for us.

The NSX calipers appear to have the correct placement. Does anyone know if these are aluminum calipers? Based on the price I am hoping so. I understand they are smaller diameters, but we don't really need more clamping force, we need increased heat tolerance.

Thanks

[MortsAccord]

There's a lot of descent info in this thread and out there, but since your only racing this car, what you need isto better fade resistance.

The rotor your looking for doesn't exist. However it can be made. Adams rotors will drill any rotorhat to your lug spec. That is.. they will custom drill any OEM blank rotor. They will not create a custom sized rotor hat.

I would see about getting a DBA rotor with the kangaroo paw tech, with slots.

The largest rotors that will fit are s2k and rsx type s VS they are 11.8 up front and the s2k runs an 11.2 in the rear.

The best way to.make sure it will all fit is go to rockkauto.com and look at various OEM ROTORS on honda vehicles. Centric has jpg files of the rotors profile, this will allow you to know what rotor you can match up, ignoring the lug pattern, since adams can drill any lug part for you, just choose the rotor you want.

Be sure to use a bracket that will fit the rotor you want. I would look fir a rotor that is 28mm thick, it will have moreweight and dissipate heat easier than a thinner lighter counterpart.

Calipers wont be needed as long as you can lock the brakes up. If you can't id suggest a smaller master cyln first then stainless lines and better fluid.

Bleeding legend calipers is cake. C clamp or a block of wood is all you need. They do have deferent sized pistons so they should go on a certain way, regardless of what people say.

The 2 largest calipers are off an oddyessy(2 pistons both 45mm) or a pilot(1 piston 67mm) I don't know if they will fit the normal caliper brackets we use for upgrading our stock brakes. These would be a bit overkill if you ask me.

Brake bias is important, so changing calipers may result in an upset in that balance and actually hurt your overall braking performance. You'll need 80-0 stopping distances for a reference.

From what I gather though all you need is more fade resistance right?

[Darkcloud]

Also keep in mind bigger rotors not always better yes more surface area for pad contact but clamping force is worked by 1 piston or 2 pistons if you decide to use dual piston calipers.

The number of caliper pistons is what really make s diff in racing for braking mainly. The better the clamping force the faster the braking.

If you can find a set of 4 pot calipers and can make them work you would be golden. equal clamping force on both pads to rotor contact

Stop-tech,wilwood or ap racing calipers are 4 pot calipers and are aluminum. Being lighter.

[Slow]

Our plan is to do an adjustable proportioning valve, so brake bias is not a concern for us.

Running the 10.3" (CL2.3) rotors and stock cb7 calipers we have no issues with brake power, even at race temps. The best tires allowed in our series our dunlop direzza star specs, at we get them in the 160-200F range, and even at those temps we don't have enough grip to make braking power and area of concern.

However at Road America it became obvious we needed more size, since our rotors warped and cracked (power slots) and our pads disintegrated (hawks). These problems were not isolated to us either, many other cars had brake issues.

For brake fluid we are good, we run 600 degree stuff and it is never in the car longer than 6 months.

I am open to the idea of redrilling rotors to fit, but I dont' really want to have to do custom brackets. If I went to some 28T bracket will that also move the caliper out (out = away from hub centerline) another inch beyond where ours mounts today? I assume a 1 inch difference when going form 10" rotors to 12" rotors. (all numbers are approximate to illustrate a point)

Thanks for all the input, it is appreciated

[MortsAccord]

You'll need a 28T bracket to accomodate a 28mm thick rotor. I would work with a 23T first. You'll need the rotors to match the bracket. also affecting this is the brackets height, a car with a 23t bracket doesn't always have the space needed to fit an 11.2 rotor.

Basicly the only difference between the T brackets is teh thickness of rotors they can accept. a 28T can accept any rotor mind you. However if you put a 23t(23mm thick) rotor in a 28T bracket and the pads wear down too far, you could be in trouble. also the piston would be that much farther out of its bore- though I seriously doubt it would be out so far that it would actually pop out.


Known fitment as far as rotors and brackets:

Presuming you are currently using the stock 2.3 CL rotors, centrics stats on this rotor are as follows.

Diameter: 260mm (10.2),
Height: 47mm
Nom Thick: 23mm
Min Thick: 21mm
Hub Reg: 64mm
Bolt Size: 12.5mm
Bolt Circle: 4x114.3
Weight: 11.5 lbs

You can try doing a small upgrade to the 93 prelude VTEC rotors and caliper brackets. The caliper you currently have will suffice just fine since it is working right now, increasing the rotor diameter by 1 inch will add 11% more brake torque, and actually make the front calipers workload less. so as stated before. Unless you can't lock the tires up don't worry about calipers yet.

93-96 Prelude VTEC front rotors
Diameter: 281.8mm (11.2)
Height: 47mm
Nom Thick: 23mm
Min Thick: 21mm
Hub Reg: 64mm
Bolt Size: 12.8mm
Bolt Circle: 4x114.3
Weight: 14 lbs

If this slight modification keeps your brakes in a condition that is favorable then I would stop upgrading there. Smallest rotor in diameter and weight that will do the job is what you need. I would also look into getting lightweight 15" rims back on the car as this setup will clear under almost all 15" rims. The S2k fronts(11.8)'s will only clear under more expensive rims, such as regamasters, traklites, and volks. otherwise it would require a 16" rim at the minumum(i realize you have 17's) I run a 15" traklite myself which weighs in at 9.9lbs - less rotational weight and it being closer to the center of the hub will help, but the cost may not be worth it.





Rear

Accord/acura CL rear rotor:

Diameter: 260mm (10.2),
Height: 48mm
Nom Thick: 10mm
Min Thick: 9mm
Hub Reg: 64.12mm
Bolt Size: 12.6mm
Bolt Circle: 4x114.3
Weight: 9 lbs

S2k rear rotor

Diameter: 281.6mm (11.2),
Height: 39.6mm
Nom Thick: 11.9mm
Min Thick: 10mm
Hub Reg: 64.2mm
Bolt Size: 12.8mm
Bolt Circle: 5x114.3(would require redrill/custom rotors
Weight: 10 lbs




S2000 caliper and bracket- this SHOULD fit and will give you an 11.2 rear rotor. I ordered acura legend GS rear caliper brackets and they are not correct for a 11.2 rear rotor- offset or bracket height.- so dont try that combo - find a junk yard with an S2k drive the track car there and test it if need be. But this SHOULD work- aside from the bolt pattern- which you could re-drill a set of rotors or custom order a set with the pattern drilled you need.

If the rotor doesn't line up correctly at the junk yard should you try to fit S2k rears on the car... if the stock rotor lines up with the bracket correctly but the s2k rotor does not you can deal with this by getting a rotor from a 2009 accord, they are also 5x114.3 so a redrill/custom order is needed.

Heres the rotor for a 05-10 accord


Diameter: 281.6mm (11.2),
Height: 48.8mm
Nom Thick: 9mm
Min Thick: 8mm
Hub Reg: 64.1mm
Bolt Size: 12.6mm
Bolt Circle: 5x114.3
Weight: 8.8 lbs

As you can see the stats on this rotor are near identical to the stock rear rotors, aside from rotor diameter and bolt pattern. So if the stock rotor lines up correctly with a s2k rear caliper bracket(it should look a little small when fitting inside that bracket) then you'll need the newer accord rotors. If the S2k parts interchange well then you just need the S2k rotor redrilled.



Untested options are
s2k front caliper bracket/rotor(redrilled) 25mm thick rotor 11.8 diameter weighing 14.5lbs (rotor hat offset different from stock rotor)
OR
05-10 oddysey front caliper/bracket/rotor 28mm thick 11.8 diameter and weighs in at a HEFTY 17lbs(rotor hat offset closest to stock)

Any way it goes, keep the original configuration for racing on the other track, where you can use a smaller setup for better weight savings.

[SSMAccord]

Untested options are
s2k front caliper bracket/rotor(redrilled) 25mm thick rotor 11.8 diameter weighing 14.5lbs (rotor hat offset different from stock rotor)
OR
05-10 oddysey front caliper/bracket/rotor 28mm thick 11.8 diameter and weighs in at a HEFTY 17lbs(rotor hat offset closest to stock)

Any way it goes, keep the original configuration for racing on the other track, where you can use a smaller setup for better weight savings.

Actually other than needing to be redrilled to be 4 Lug for his application the S2k rotors, calipers, and brackets will fit. I was running this set up, but the rotor hat height difference required a 7mm spacer between the caliper bracket and mounting tab. I replaced the S2k rotor with RSX Type-S rotors (same diameter, different rotor hat depth), this solved the spacer issue, but i did have to have the center spindle area bored out 8 mils to seat over the axle nut area.

[Losiracer2]

So i checked out legend calipers, and they appear to mount in the back rather than the front, and switching sides or having the bleeder on bottom doesn't seem ideal for us.

The NSX calipers appear to have the correct placement. Does anyone know if these are aluminum calipers? Based on the price I am hoping so. I understand they are smaller diameters, but we don't really need more clamping force, we need increased heat tolerance.

Thanks

I mounted my Legend calipers the way they were supposed to, just had to undo one of the caliper mounting bolts and flip it up so the bleeder was oriented correctly. Held the caliper in that position with a coat hanger. I then cracked the bleeder open, attached a hose to it and started bleeding. I didn't need a block of wood or anything, all you're doing is pushing air bubbles out so that's not enough force to pop the pistons out.

Took me about 5 more minutes to undo the bolts on either side and hang the bracket on the coat hanger...well worth it to know that they'll work like Honda intended, regarding the clamping orientation.

[MortsAccord]

Actually other than needing to be redrilled to be 4 Lug for his application the S2k rotors, calipers, and brackets will fit. I was running this set up, but the rotor hat height difference required a 7mm spacer between the caliper bracket and mounting tab. I replaced the S2k rotor with RSX Type-S rotors (same diameter, different rotor hat depth), this solved the spacer issue, but i did have to have the center spindle area bored out 8 mils to seat over the axle nut area.

I wasn't sure of the caliper brackets offset on the s2k. Forgot to touch on that eh? I also wonder if the oddessys caliper bracket will fit on our cars and align correctly with an RSX-s rotor. That would allow a very large pad to be used in conjunction with an extremely heavy/large rotor over the stock configuration.

Rockauto.com is a great referencing tool when you know how to use it. I wish they had more detailed information on caliper brackets though. Or some honda website that has the dimensions of all the brackets honda makes and what cars they come from. Not just someones list of which brackets are what thicknesses.

I should just make autozone eat some shipping costs, order parts to check/ measure and return.

[SSMAccord]

I wasn't sure of the caliper brackets offset on the s2k. Forgot to touch on that eh? I also wonder if the oddessys caliper bracket will fit on our cars and align correctly with an RSX-s rotor. That would allow a very large pad to be used in conjunction with an extremely heavy/large rotor over the stock configuration.

Rockauto.com is a great referencing tool when you know how to use it. I wish they had more detailed information on caliper brackets though. Or some honda website that has the dimensions of all the brackets honda makes and what cars they come from. Not just someones list of which brackets are what thicknesses.

I should just make autozone eat some shipping costs, order parts to check/ measure and return.

It might actually be better to run a 03-08 (and possibly newer) Accord V6 MT coupe or 04-08 TSX rotor and caliper setup. They have a much larger pad interface area than the S2K/RSX Rotor, which is actually quite small. They use the 28mm thick rotors and have the correct rotor hat depth.

[C91BLX7]

08 Acura tl typeS brembo's. Or Acura RL brembo's and brembo slotted rotors for corresponding vehicles.

2nd gen RL calipers and 350z rotors.

[8ball]

i think there are better options using newer crv Odyssey and pilot brake parts, 7thgen accords use them and have reported using rotors bigger than 12 inches front and back using nissan maxima front rotors and i forget what rears but the info is out there.

[Jarrett]

When considering brake rotors you need to understand that there are many different dimensions besides rotor diameter. Also, just blurting out a make and model from which to get parts only adds to the confusion and is the reason people make a 10 new threads a day asking for clarification on stuff. If you want to contribute it as information, why don't you do some leg work to help out the community? Otherwise, it's just hearsay.

To clarify, I'm speaking in general terms for everyone and not just about rotors. It is true that other manufacturer's rotors can be used but like I said, all dimensions need to be considered.