maverik259

Hey guys, not really sure where else to post this but just trying to get someone to confirm my thinking...

so the SLK/CLK 55 6 pot front calipers take a 340x32mm rotor while the c55 utilizes a 345x30mm rotor...as I'd love to not have to replace my perfectly good front rotors when switching to the 6pots I was thinking I could just add a 5mm spacer to the caliper to make them clear the 345mm rotor...

Any thoughts?

I know this has been done to a few who have put the CL55 rear calipers on the w203 and they needed spaces...

and for those **** retentive fellers out there have no fear I will be utilizing the 2 piece rotors once my C55 ones need replacing, but I can't help but to take advantage of the ability to save some $$$ if I can not to mention not put to waste some perfectly viable equipment!

Viper98912

As long as there's 2.5mm of clearance in the jaws of the caliper. There may not be; they ride pretty close. And if you pull one off a P030 car you'll need the 360mm rotors.

maverik259

ya they're not the 360mm rotors... I'll have to test run it as soon as they come in just to see whats up, and I have a company that can make me some stainless steel washers to exact specs to provide proper separation...i was just wondering since the specs are so close and the racingbrake rotors are 340x30mm rotors and they say they work for the slk/clk 55 calipers etc

maverik259

correction I think I would just need to add a 2.5mm spacer vice a 5mm since its only 2.5mm in radius larger than the 2 piece clk55 rotor...

Viper98912

I think you're missing something

maverik259

lol, what am I missing?!

Viper98912

I don't know if the casting is one piece or has a radial mount. If one piece your spacer idea won't work

320 dreamer

its not. the 6 piston caliper has a separete mounting bracket. trya 2.5 mm spacer and longer mount bolts and you should be fine until you get the r/b rotors

maverik259

ya its radial because the 030 performance package uses 360mm rotors but the same calipers...thats why im considering this...and ya dreamer thats what i was thinking...i doubt I would really need longer bolts too, i mean 2.5mm isn't really that much to lose on the bolt that I would be concerned with it attaching properly...

maverik259

alright 2.5mm washers came in so i went ahead and put them on and they fit great. Next I decided to go ahead and test fit one of the front calipers to see if my calculations were correct and they would fit the 345mm rotor, so i propped up the 4pot caliper in the back of the wheel well and bolted up the 6pots they looked beauitful...a decent amount of play between the pads and rotor but there is only a 1mm difference per side between the 2 piece rotor (32mm) and the c55 rotor (30mm) so i'm quite confident the pistons will be able to travel that distance just fine, just makes it easier on install putting them on! lol but ya put them on and then throw the wheel on to ensure no rub (not that i was too concerned) and voila!

everything fits great, only thing is that I feel i will have to buy new c55 front rotors since i noticed a slight lip that has formed on the rotors that I see the new pads on the 6pot will engage thus creating seperation between the pad and friction area of the rotor...oh well still about $1000 less than 2 piece

Saaboteur

Pix or it didn't happen!!!!

Viper98912

Make sure your rotor height offsets work out correctly with your new calipers.

maverik259

i test fitted them and it all fit...what exactly do i need to ensure about the heights, obviously they differ by about 2mm but I would assume thats mostly due to the fact they is a 2mm difference in overall thickness in general...are you saying I need to add a 2mm spacer between the rotor and the hub?

I would assume worse case scenario that the travel distance of one side of pistons is less by 2mm than the other, but hydraulically speaking as long as the pistons can travel that distance in general then that shouldnt be a big deal since the fluid fill the reservoirs appropriately...

Viper98912

dude assumptions are what cause failures. make sure you take the right measurements with the right tools and that it all stacks up correctly

maverik259

lol there aren't any measurements to take, im just saying being an engineer I am familiar with the dynamics of hydraulic systems and there is nothing to say the rotor has to be perfectly center. I did test fit it and nothing was rubbing whatsoever and the pads werent even touching the rotor...

I thought you actually knew that the height difference would create a problem, but since the test fit should promising results I am not worried...when you bleed the brakes it fills the piston resevoirs with fluid which pushes them against the rotor. Your pads essentially maintain constant contact with your rotors so as long as this is done I am not worried about a 1mm here or there difference. But I will of course have to verify this once I install everything and bleed the brakes. I will most likely install and bleed a single front first to ensure all works properly.

Thanks for the concern

maverik259

just confirmed it from RacingBrake. Their rotors are actually have the same issue with the offset. They use the same exact rotor between the 4 pot and 6pot set up with a 1mm deviation. I called them and they said nothing has to be done and no washers need to be added, its just a FYI they added to let you know a deviation inside the caliper will exist but it doesn't matter in the end, so I will be installing all the brakes and rotors tomorrow!

maverik259

everything installed and stops on a dime...no but literally! best mod I've ever done to a vehicle, these things are ridiculous! especially since they're over $1000 cheaper than they should've!

Wilsophia

To made it short,

So, you are using the SLK55 (or CLK55) 6 pot caliper and a C55 rotor ?
Just to machine the C55 router to diameter 340mm, thats all ?
Need any spacer to the hub?

Thanks

maverik259

Didn't machine anything, just added a 2.5mm spacer to the spindle

Wilsophia

Sorry? Spindle ?
U means the add 2.5mm spacer ( or washer) between caliper and hub?

Wilsophia

Please show so pme pics if you have, many thanks

maverik259

no its between the bracket on the caliper and the caliper itself...

and pics of waht the calipers or where I put the spacers?

Wilsophia

Thanks for reply again.
Would you please state your clk55 caliper part no. and the pics where you put on the spacer ?

cause as i knkw there is no need to add bracket between the caliper and hub for the clk55 caliper to w203

thanks

maverik259

you dont add a bracket, the bracket is already attached to the back of the caliper, it goes caliper-bracket-spindle(area where the caliper bolts to the car)

this bracket is what allows them to use this same caliper on the 030 performacne package with the 360mm rotors vice 340mm rotors, the bracket is simply altered to raise the caliper outward 10mm to fit the larger rotor, so i just took the same principle and did it only by 2.5mm to fit the 345mm C55 rotor...

I dont have any pics of the attachment point but if you do a search you can find some pics to reference as I did

maverik259

here...post 96 shows the pic of the bracket...the outer bolts is where the spacers are added to raise the caliper up

https://mbworld.org/forums/c32-amg-c...upgrade-4.html