Honda CR-Z Hybrid Car Forums banner

rear brake upgrade?

21K views 26 replies 17 participants last post by  mdrolet77  
#1 ·
did a search but came up with no results. i have the spoon bbk on the way and wanted to upgrade the rear also. didnt know if anyone makes a kit or if any brake kit from another car will bolt up thats bigger
 
#2 ·
There isn't anything for the rear, except for pads and rotors. I think the reason there isn't any rear calipers available for the CR-Z is because of how the parking brake is integrated into the caliper.

With that said, I don't think it's really necessary to go beyond pads and rotors for the rear. While the Spoon calipers will certainly help stop the car a little faster, we can't forget that bigger brakes are also about increased cooling capacity, perhaps even more so. The front brakes will have heat issues long before rears will, if they ever do at all. This is why fronts are vented and rears usually aren't. Also, I wouldn't worry too much about throwing off your brake bias, or anything like that, especially with ABS, since the Spoon Calipers were designed with all these factors in mind.

If it's about looks, you can try to paint match them, but the Spoon Calipers are anodized aluminum while the stock brakes are plated steel. I don't think you can really get paint to match anodizing all that well and steel doesn't anodize, so getting a match might not be easy. Or you could just go a totally different color...
 
#3 ·
I wouldn't worry too much about the rear brakes. The brake system is biased to the front, and the Spoon calipers should be valved to take that into consideration. If anything, a slightly sportier pad and rotor will be fine.

Also, a bigger rear rotor won't change the clamping characteristics in relation to the front, it will just have a higher thermal capacity.

I'm running slotted zinc coated rotors in the rear from BP. I'd recommend them if you are looking for a stock sized upgrade.
 
#4 ·
Not to veer away from the topic, but do you need to upgrade brake lines and all other brake components for the Spoon calipers? Or do they run with the stock ones? I know you have to upgrade the rotors but thats all I know.

I posted another similar topic about BBKs, and since nobody has ever tried running the Brembo's, I think I might just go with the spoon ones. Besides, Nissin makes the OEM calipers so there mustn't be any issues with them at all with the Z...
 
#6 ·
I didn't upgrade my brake lines. I've heard of failures with braided lines when road grit gets between braids and wears away at them. Stainless lines with PTFE sheath should help alleviate this, but I haven't for sure verified that something is available for the CR-Z. A rubber line should still be the most reliable and that's the main reason I didn't upgrade.

Also it has less to do with stopping power and more to do with improved brake "feel." It should make the brakes feel more crisp and less spongy.
 
#7 ·
I was a bit disappointed to not find any big brake kits for the rear. After all, if you get a big brake kit for the front, why not go ahead and do it for the rear as well? It turns out that there IS a reason:
  • When you lose traction on your front tires, you lose directional control. For cars without ABS, it is something the driver can detect and correct. Even if it were not corrected, since the car's center of gravity is behind the front axle, there is a self-correcting moment which brings the vehicle in line.
  • When you lose traction on your rear tires, you lose directional stability. That is, any small perturbation (steering, gust of wind, a bump) produces a yaw moment (I guess that means fishtailing).

Having taken three classes related to control theory now, losing stability is bad mojo. After learning that, I guess having slightly underpowered rear brakes is not that bad after all. :)
 
#13 ·
Sorry to re-hash an old thread, but I'm just looking for an affirmative answer about using S2000 brakes in the rear; my desired combination if things are gonna work out is S2000 Hawk HPS pads, with S2000 aftermarket blank rotors (Brembo, Stoptech, etc.).

I understand that the S2000's pads will work with the CR-Z Caliper, but will the S2000's rear rotors also work with the stock CR-Z caliper?

Sorry if this has been covered, but I did do my best to search around before digging this thread up.
 
#14 ·
Tony messed up everything saying that the s2000 rotors go up front because I bought his exact kit from his car and its rsx-s rotor s2000 pad the s2000 rotor is almost identical to the rsx-s but slightly different and the rear is only s2000 pads and the rotors are different you'll have to go with either project mu, centric, or pwdjdm Rotors for the rear.
 
#19 ·
Centric specs for read Caliper on CRZ. Anything with these specs should fit.
Much appreciated!

Also answered that the rears are different they have the same caliper so its s2000 pads but the rotors are different so your only options are project mu, centric, passwordjdm or spoon
Sorry, I thought you were referencing S2000 items. Didn't realize upgraded discs were already manufactured for our application. Thanks for the clarification!
 
#23 ·
Just figured I would add my experiences in here.

I have done 12 track days and 45,000 miles on stock rear brakes and one just the original pads, and I just wore them to the squeakers. As far as my experiences go, they work great and do not need to be changed unless you want to balance the friction to match a front upgrade, without using a proportioning valve.
 
#24 · (Edited)
I am looking into using the rear rotors of the S2000 if the rotor depth is correct (11.1 inch rear rotor size stock) however I will have to use the rear big brake kit adapter that a company used to upgrade the AP1's rear kit to an 12.1 inch rear rotor, in theory if the bolts line up on the rear CR-Z hub I will just use the AP1's rear brake calipers and I should be able to use the kit to allow me upgrade size from 9.5 to 11.1, this will allow for better brake heat dissipation, and better radial brake torque without changing bite so the brake balance will remain correct.
 
#27 ·
Looks more like rust damage than anything else, you parking on grass or something damp?

As far as rear bbk using s2Ä· rotors it's not impossible but they aren't the same height so you would probably have to shim the rotor thus also shimming the wheel around 8.3mm which isn't all that much. It would most likely require a custom mounting bracket for the caliper unless the s2k one fits directly. That being said it would still be a cosmetic upgrade as I doubt there is a real need for it...