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Discussion Starter · #1 · (Edited)
From My P* Owners FB Post:

"One of the nicest aspects of owning a P* has been the opportunity for engagement with other owners. I've learned so much from others with more experience and expertise and that has enabled me to take my car further in its development than I could have ever done on my own. This collaboration was at the center of bringing a series of new Rotora brake products to the P* aftermarket.
Boban had approached Rotora (located in Socal) about developing products for the P*, Rotora reached out to Robert who they knew to be involved with Polestars. Robert recently sold his P*, so he referred Rotora to me. My P* is not a daily driver, so it's available for manufacturers to borrow, as product workups can take weeks. I offered my car to Rotora who used it as the fit model for the line of brake components displayed with this post. I've posted specs on the products to IG:lcfpolestar,
and I will be covering installation and performance feedback on Swedespeed. As for initial impressions of the Rotora products; first off, I am biased, objectivity left the house when I pushed the spend $$$ button. Prior to this project, I had never heard the term "Brake Bling". This is truly jewelry for your P*. The quality is off the hook. Everything is either forged or machined aluminum. Rotora tunes the brake bias to increase the rear bite, which unloads the fronts. I can tell you, this modification has completely changed how my car behaves under braking. So with that I will suspend my comments. More to follow on IG and Swedespeed."

I have always appreciated the Brembo front brakes on the P* and consider them to be one of the cars signature features. I, like many owners though, were never completely pleased by the disconnect between the performance oriented Brembos in the front and the very plain Jane rear brakes. Several owners have tackled this in various ways, with Elevate Cars making a direct replacement slotted rotor which matches the pattern on the front. Along with a polish and paint of the rear caliper and a set of P* graphics that makes a nice cosmetic upgrade that goes along way to resolve the appearance gap.

When Rotora approached me about using my car as a test fir for a new line of products for the P* I decided to go all in on a front and rear brake upgrade. This choice is not for the pocketbook faint of heart, and I am still in denial over what I spent.

They offer two brake system upgrades:

Option One: is new two piece cross drilled front and rear rotors, and new four pot rear calipers, painted to match the silver Brembos with the same exact caliper paint Volvo uses. This includes stainless steel brakelines and is fully compatible with the E-parking brake. The Rotora label can be omitted allowing the owner to place P* graphics on the rear caliper.

Option Two: A complete replacement of front and rear calipers and rotors, details here (I also replaced my brake fluid with Motul 660):

STREET CHALLENGE SYSTEM:

FRONT:
Forged Aluminum (2024-T6) 6-Piston Caliper (RF603 type, Silver)
380x32mm (15”) 2-Piece Directional Disc Ring (Airfoil Slot)
Forged Aluminum Bell Hat (6061-T6, black hard-anodize finish) with Anti-Rattle Float Drive Hardware
Forged Aluminum Caliper Bracket (7075-T6, black hard-anodize finish)
Stainless Steel Braided Brake Lines
H6 High-Ceramic Performance Pad


REAR:
Forged Aluminum (2024-T6) 4-Piston Caliper (RF411 type, Silver)
355x29mm (14”) 2-Piece Directional Disc Ring (Airfoil Slot)
Forged Aluminum Bell Hat (6061-T6, black hard-anodize finish) with Anti-Rattle Float Drive Hardware
Forged Aluminum Caliper Bracket (7075-T6, black hard-anodize finish)
Stainless Steel Braided Brake Lines (Upper & Lower)
H6 High-Ceramic Performance Pad
Rotora Electronic Parking Brake Module

Both options improve the braking performance of the car. Much the same way a aftermarket rear sway bar (RSB) shifts some of the handling bias to the rear of the car, so does this brake upgrade. Volvo purposely heavily bias the car to understeer as that is the safest for the general consumer. By shifting a calculated proportional share of the bias to the rear, the car livens up. As my race car alignment specialist observed when he was adjusting the camber and toe of my rear wheels, "...your stock setup is too tight..." Even with this brake upgrade, the brakes have been tuned by Rotora to maintain an understeer balance, the back end stays planted. Both myself and owner "Boban" (who installed Option One), have described that the car "...brakes now as if you are deploying a drag chute". I'll post more impressions once I get to track the car but I am very happy at this point. If you are interested in these products for your car, contact [email protected], mention this post to receive special pricing.-Jeff

See a photo collection here (you may have to cut and paste): https://www.flickr.com/photos/[email protected]/albums/72157706179646031

And some immediate eye candy:

3 by lcfpolestar, on Flickr

11 by lcfpolestar, on Flickr

15 by lcfpolestar, on Flickr

5 by lcfpolestar, on Flickr

18 by lcfpolestar, on Flickr
 

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Fantastic - Thank you for posting this! I look forward to hearing more about your experience with them in future posts.
 

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As my race car alignment specialist observed when he was adjusting the camber and toe of my rear wheels, "...your stock setup is too tight..."
I'm not "racer" (sofa or otherwise), but what the heck does that mean? When a guy doing an alignment says "your car is too tight" and what does that have to do with the new BBK?
 

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Would love to update that rear caliper! Thanks for this post.

About the car being too tight, I just purchased a 2018 S60P (less than 5K miles) and noticed the wheels and steering picks up a lot on uneven highway road surfaces... Anyone else getting this? I was thinking it’s due to the suspension being so tight, bushings and all...


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Discussion Starter · #5 ·
I'm not "racer" (sofa or otherwise), but what the heck does that mean? When a guy doing an alignment says "your car is too tight" and what does that have to do with the new BBK?
Let me explain. "Tight" is a term used by NASCAR drivers to describe understeer. Understeer is often described as the tendency of the car to not turn in "..the car is pushing", or the tendency of the front tires to loose grip in a turn, the opposite is "loose" or oversteer, where the back of the car looses grip and wants to come around on its own. In regards to my car, Darin wanted to tune in a bit of oversteer into the rear, making the rear a little more lively so it would come around some on its own (aka: less tight).

In reference to the BBK, I wove two observations together to discuss the bias of the car. Volvo sets up both the braking bias and handling bias towards understeer. Lets exaggerate this a bit: your heading into a turn and you slam on the brakes (forget about ABS for a second) and the front of the car locks up and the car skids straight ahead. The back of the car stays inline with the front, which is good, and safe. Or you are making a hard left turn (no braking), so hard that the front of the car starts skidding straight instead of turning in, but the back of the car stays inline with the front, safe again. The opposite would be the back of the car trying to swap ends with the front ("loose").

In both of these scenarios, Volvo tunes in a very wide margin to make the car bias towards understeer (very conservative). When a car is neutral, neither has understeer or oversteer, it is considered balanced. Both the BBK and the RSB shift some of the cars bias from understeer towards balance (turning and braking), but still leave it biased towards understeer, just less so. The reason Darin wanted to add some oversteer in is because the car would be faster through the corners if it wasn't "so tight".

I hope this explanation is insightful and I encourage those with more knowledge to chime in.
 

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Discussion Starter · #6 ·
Would love to update that rear caliper! Thanks for this post.

About the car being too tight, I just purchased a 2018 S60P (less than 5K miles) and noticed the wheels and steering picks up a lot on uneven highway road surfaces... Anyone else getting this? I was thinking it’s due to the suspension being so tight, bushings and all...


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Please see my answer to tonyc, I am using the term "tight" a different way.
 

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Please see my answer to tonyc, I am using the term "tight" a different way.
Gotcha! I misunderstood the term tight, sorry for being so off topic.



Sent from my iPhone using Tapatalk
 

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Hi mate, what's the price for the front and rear brakes? i like this.
 

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Discussion Starter · #10 ·
Hi mate, what's the price for the front and rear brakes? i like this.
Please see the Viva website for their latest pricing. Rotora brake components are a premium product and command a premium price. I will personally vouch that they are worth every penny spent. And you can enjoy them every time you drive the car whether its street, canyon or track.
 

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Hi mate, what's the price for the front and rear brakes? i like this.
If you want a used set I currently have mine front and rear kits up for sale. Green calipers, seals, and dust boots replaced as well as the e-brake module was rebuilt by Rotora for the sale. I have my ad up on facebook marketplace in the polestar owners page as well as the polestar optimized page, my instagram @tshirtdriving asking $3500 for set. Shipping might be expensive if you are in France as I am located in San Diego California. If you are interested I can send detailed photos and answer all your questions. Currently selling as I upgraded to Rotora's challenge kit which is dedicated for 100% track use.
 

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This is what I did with mine. The Rotora calipers are not suitable for the Uk market I think due to the way they operate the hand brake. I used the standard calipers.




 

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Discussion Starter · #15 ·
This is what I did with mine. The Rotora calipers are not suitable for the Uk market I think due to the way they operate the hand brake. I used the standard calipers.




Those rotors look great, they fill up the wheel well better and should improve your stopping power.
 

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They do look good. Standard calipers with bigger disks ? Adapter bracket required to move the caliper outwards ? After 6 months of SORN (a you know, a UK thing; off the road so no tax to be paid ) the rear disks on my car look very sorry for themselves.
 

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They do look good. Standard calipers with bigger disks ? Adapter bracket required to move the caliper outwards ? After 6 months of SORN (a you know, a UK thing; off the road so no tax to be paid ) the rear disks on my car look very sorry for themselves.
Yes had some adapter brackets machined for the calipers. Had the discs made with 8mm less offset on them to allow for the bracket.
 

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What diameter are the discs ? There must be some pretty large diameter standard Ford vented discs available, like the front ST Focus ones. Same PCD. A lot cheaper than bespoke ones.
 

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What diameter are the discs ? There must be some pretty large diameter standard Ford vented discs available, like the front ST Focus ones. Same PCD. A lot cheaper than bespoke ones.
350mm Diameter. Front ST discs would be no use on the rear with standard calipers. They would be to thick. I looked at plenty of ideas but bespoke was the only way to go. And a LOT cheaper than the Rotora option
 

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Thanks, just thinking (posting) out aloud; the V60 Polestar rear discs are vented, are they unusually thin, thinner than other Ford related vented discs ?
 
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