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2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
To size up the rear to 360 all you need are the BS calipers and a rotor that has the correct ebrake drum (you need a rear hat with 165mm drum to fit 360mm rotor). Racing Brake makes one, not sure about anyone else.
To size up the rear to 360 all you need are the BS calipers and a rotor that has the correct ebrake drum (you need a rear hat with 165mm drum to fit 360mm rotor). Racing Brake makes one, not sure about anyone else.
Coming back to this obviously a smaller drum than 165mm would not work but what about a larger one if it was around 180mm surely being bigger it would fit over what it needs to with space to spare if all the other dimensions are not too far away?
Coming back to this obviously a smaller drum than 165mm would not work but what about a larger one if it was around 180mm surely being bigger it would fit over what it needs to with space to spare if all the other dimensions are not too far away?
Sure. You'd then need to reinvent all the bits on the inside, including new e-brake shoes with the same curvature for your bigger hub.
No to put too fine a point on it, but who exactly is having problems with overheating rotors on their C63 (even without brake cooling ducts, which would be the first thing to add if you're racing the car)?
Show me one factory spec race car that has anything other than 18" wheels, which limits the maximum brake rotor size. Smaller rotors slow down and stop the car just as well as large ones, and they have the added benefit of having lower (unsprung to boot) mass. The only thing a larger rotor does better is heat dissipation, but there are ways to deal with heat removal that are nowhere near as expensive to implement for those that actually may need them in the first place.
And, the rear rotors provide so little braking force that they barely get warm. It would take a lot more than racing (let alone just aggressive driving) to come even close to the thermal limit of what the OEM rear rotors can dissipate.
The radii of a 165mm and "a larger one around 180mm" circles are different, so if the OP wants to use something other than the 165mm hub and RB rotors, whatever rear rotor hat ends up using will require new and likely custom made parking brake mechanism components, including the brake shoes. Brake shoes meant to fit in and press against a 165mm hub will neither properly fit nor uniformly press against a 180mm hub. @BLKROKT already answered the question of "what do I need to run 360mm brake rotors on the rear" (the RBs come with a 165mm hat that fits over the existing hub). The new question is "can I use something with an even bigger hub around 180mm" and the answer is sure, if you're willing to completely redesign the rear hubs. Hubs from an E63 are certainly one option, but then it's not just the calipers and the rotors but also the entire hub and parking brake assembly from an E63 that would need to be replaced.
The radii of a 165mm and "a larger one around 180mm" circles are different, so if the OP wants to use something other than the 165mm hub and RB rotors, whatever rear rotor hat ends up using will require new and likely custom made parking brake mechanism components, including the brake shoes. Brake shoes meant to fit in and press against a 165mm hub will neither properly fit nor uniformly press against a 180mm hub. @BLKROKT already answered the question of "what do I need to run 360mm brake rotors on the rear" (the RBs come with a 165mm hat that fits over the existing hub). The new question is "can I use something with an even bigger hub around 180mm" and the answer is sure, if you're willing to completely redesign the rear hubs. Hubs from an E63 are certainly one option, but then it's not just the calipers and the rotors but also the entire hub and parking brake assembly from an E63 that would need to be replaced.
So if I am correct when using the handbrake the internal shoes push up against the inside sides of the 165mm pad on the disc? So a larger one they would not contact.
The reason I said about a 180mm is if you look below at the dimensions in the third picture the RB 360mm looks like it has a 180.2mm pad and the one I want to use in the second picture has a 180.1mm pad. So how does that RB 360mm work if the only other part replaced is the rear calipers which you have to do anyway. Sorry if I am missing something here with all this.
See below.
First picture stock 330mm rear discs
Second picture 360mm one I am thinking of using
Third picture RB 360mm rear
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Or… you could just not give a shït if the parking brake works correctly or not. I don’t think I’ve ever used mine in almost 9yrs of ownership. Maybe find out if the pads contact in an emergency. ¯\_(ツ)_/¯
Seriously though, re-engineering the whole rear axle is essentially the BS conversion and it’s a huge list of parts including the knuckles, arms, axles and diff. I would’ve considered it myself if I hadn’t done the rear diff cooling and DSS axles already. And suspension arms and bushings etc. I wouldn’t convert just to get a bigger ebrake on there.
Why don’t you just have someone send you a dead RB rear disc and have someone machine you the hat you need?
Or… you could just not give a shït if the parking brake works correctly or not. I don’t think I’ve ever used mine in almost 9yrs of ownership. Maybe find out if the pads contact in an emergency. ¯\_(ツ)_/¯
Seriously though, re-engineering the whole rear axle is essentially the BS conversion and it’s a huge list of parts including the knuckles, arms, axles and diff. I would’ve considered it myself if I hadn’t done the rear diff cooling and DSS axles already. And suspension arms and bushings etc. I wouldn’t convert just to get a bigger ebrake on there.
Why don’t you just have someone send you a dead RB rear disc and have someone machine you the hat you need?
The idea is to machine a new rotor hat with those rings in the second image if this option doesn’t work but like I said looking at the stock dimensions in the first image and those from the RB conversion in the third image they are within 1 or 2 mm most dimensions to the rotors in the second image so looks like they would work. If they did work it also works out cheaper buying those discs and new rear calipers than any other option which then others can purchase if they wish to do the conversion.
I also don’t think anyone would keep or send out a used RB rotor plus they keep the rotor hats when they get new discs and I would need the whole thing if I was to do it that way.
RB has a fairly large selection of hats and rings in stock and they will likely be able to find a 360mm ring that bolts on to the non-BS C63 rear hat with a 165mm I.D. hub, or alternatively machine you two new hats with a 165mm hub that will bolt on the 360mm ring from their BS kit. It's a lot cheaper to have custom 2-piece rotors made than replace everything else that you'd need in order to mount a BS rear rotor on a non-BS car and have a functioning parking brake.
And yeah, the parking brake just may be completely "optional" depending on where you live and how you use the car. I didn't have a working parking brake on the C5Z when it was still plated because I ran aftermarket 2-piece rotors on all four corners (the handle was still there just in case I got pulled over but it wasn't connected to anything). A set of $10 wheel chocks will hold the car better than a parking brake anyway, and you can carry a set in your trunk just in case.
So Epytec now ships to the states via their eBay store. I purchased the w211 brackets and am waiting for them. They just cleared customs. Here's to hoping they fit! They have 204 211 212 and many other options listed so hoping they did their due diligence on the 211 since their seems to be some discrepancy and fitment confusion across chassis
And they're here and they fit perfectly!
Let's beat a dead horse. Since this is my family hauler I didn't really want to do spacers nor an aluminum bracket. Lo and behold Epytec out of Germany now ships to the states via their Ebay store! Just giving this information for you to do what you will with. I needed new brakes and the 390s were cheaper so here's the new setup.
w211 E63 uses Epytec part number 713 made of STEEL.
I didn't see the bracket for the w204 listed and messaged them asking if they have a bracket for w204 available. They sent me a reply saying they won't break eBay's rules and they can't sell anything not listed... haha I'm guessing something got lost in translation
I didn't see the bracket for the w204 listed and messaged them asking if they have a bracket for w204 available. They sent me a reply saying they won't break eBay's rules and they can't sell anything not listed... haha I'm guessing something got lost in translation
weird, I'm sure I saw it. I'll try to find it for you.
its there. Part Number 890
Ebay Item number 323558442235
Last edited by PNW_E63_AMG; Apr 13, 2024 at 10:58 AM.
For anyone interested in the Adapter Brackets described below, long sold out via this forum, and then sold out on eBay:
(Front Caliper Adapter Brackets for 390mm Rotors, guaranteed to fit OEM MB 507 Wheels, any MB OEM 19" Wheels, and likely All Aftermarket 19" Wheels):
I have an extra Pair of Brand New, Never Mounted Adapter Brackets.
$325 Shipped to Continental USA, or local pickup in Southern California (Bakersfield, or Santa Monica to Torrance areas)
I've been using these Adapter Brackets for 4+ years without any issues with the 507 Wheels, and under some very severe braking conditions.
Please Note: they do not come with the Caliper mounting Bolt hardware
You may likely need new/longer bolt hardware, but I am not 100% sure, as it's been more than 4-5+ years, and I believe my technician Matt simply re-used the RacingBrake hardware left over from the RB kit i had purchased.
Fellow forum members who have this same Adapter Bracket: SikC63, Dr.Speedfellow, and Hachiroku (Barry of eightysixtuned.com) may be able to further assist with the hardware specs
I had the first set designed and fabricated by exceptional AMG Master Tech Matthew Stockwell of Leistung Autohaus and his fabricator - i believe he was an aerospace or materials engineer, and paid significantly more than this EBay price.
I had these custom Brackets fabricated because my RacingBrake bracket would make the front caliper rub on OEM 19" 507 wheels (but were perfect and without rubs on OEM 19" Turbine style wheels). I attribute this to a taper in the 507 wheel. The new, custom Brackets also optimized the brake pad/rotor contact area, which was now perfectly centered/symmetric, whereas with the RB Bracket, it was off by a 1-2 millimeters.
Have been running these same Brackets offered above on EBay for over 1yr without issue, with the OEM Non-BS Front Calipers, RB Rotors, and 507 Wheels.
You may need custom sized bolts with which to secure Front calipers onto new Bracket. The OEM Brembo bolts may not work.
Disclosure: this is not my EBay listing. It is offered by a gentleman who initially invested in a run of these for our community.
Guess I should have done more research, but did not realize that there was a interference with some 390 brackets and 507 wheels. Is anybody running the running the EPYTEC bracket on stock 507 wheels? I read through this while thread and couldn't find that answer and my brackets are on their way to me now.
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