Basic brake options for 200 Kompressor - Mercedes Benz SLK Forum

Performance MODS for the R171 Tuning and Performance modifications for your SLK

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#1 Old 03-04-2014
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Basic brake options for 200 Kompressor

Hi everyone,

I have been away from Mercedes ownership for a good few years, but back now with a basic R171 200 Kompressor. I confess it is a toy for my old age to enjoy the sun without getting into too much trouble - unlike my earlier days with a W202-43, R129-500 and R230-55...

First up, I am appalled at how poor the brakes are! So I am on a mission to change them! I am not looking for bling in having AMG 6 or 8 pots - just a simple upgrade to a 2 or 4 pot, but they must be MB spec - ie Brembos and not any of the aftermarket ones around.

I do remember that so many calipers in the MB range are used on different models that it gets confusing. Someone on MB World many moons ago promised to do a spreadsheet with all the different combinations of disc and calipers, but I cannot find it, so guess the task was too onerous! Someone should do it though!

Will someone tell me please, what calipers were used in the various sport packages - both front and rear? I was planning to swap out my single pot for the two pot that was used on the C Class, or would I be better using the 4 pot off the C32? The rears I particularly want some guidance on what was used. Any photos will help enormously as I will recognise the parts used.

Thanks in advance
Hal
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#2 Old 03-04-2014
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#3 Old 03-04-2014
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I'm interested in this as well. I'm just beginning to learn how my SLK280 handles, but I've already noticed that on tight downhill corners (up off Skyline Road, for you PDX folks) that I can get into the ABS sooner than I would with my C230 or long-ago 16v. It could be that the more-capable chassis is carrying more speed than the earlier cars; I was more focused on the road than the speedo so that may be the case. But with that and the always-atrocious factory brake dust, I would be very interested in disc/caliper/pad combos which will fit inside the factory 16" rims.
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#4 Old 03-04-2014
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Quote:
Originally Posted by Hal Adams View Post
Hi everyone,

I have been away from Mercedes ownership for a good few years, but back now with a basic R171 200 Kompressor. I confess it is a toy for my old age to enjoy the sun without getting into too much trouble - unlike my earlier days with a W202-43, R129-500 and R230-55...

First up, I am appalled at how poor the brakes are! So I am on a mission to change them! I am not looking for bling in having AMG 6 or 8 pots - just a simple upgrade to a 2 or 4 pot, but they must be MB spec - ie Brembos and not any of the aftermarket ones around.

I do remember that so many calipers in the MB range are used on different models that it gets confusing. Someone on MB World many moons ago promised to do a spreadsheet with all the different combinations of disc and calipers, but I cannot find it, so guess the task was too onerous! Someone should do it though!

Will someone tell me please, what calipers were used in the various sport packages - both front and rear? I was planning to swap out my single pot for the two pot that was used on the C Class, or would I be better using the 4 pot off the C32? The rears I particularly want some guidance on what was used. Any photos will help enormously as I will recognise the parts used.

Thanks in advance
Hal
If you think the SLK brakes are 'poor' you should drive a Mk1 Sprinter the pedal creeps to the floor but it does stop and pass an MOT!!
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#5 Old 03-04-2014
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Originally Posted by Beekster View Post
.. .. that I can get into the ABS sooner than I would with my C230 or long-ago 16v. .. .. ..
???? If your ABS is kicking in sooner than you expect, it means your brakes are better than you expect them to be (or, your tyres have less grip than you would expect). Nothing that can be improved by putting 'better' brakes on it.






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#6 Old 03-04-2014
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Quote:
Originally Posted by Beekster View Post
I'm interested in this as well. I'm just beginning to learn how my SLK280 handles, but I've already noticed that on tight downhill corners (up off Skyline Road, for you PDX folks) that I can get into the ABS sooner than I would with my C230 or long-ago 16v. It could be that the more-capable chassis is carrying more speed than the earlier cars; I was more focused on the road than the speedo so that may be the case. But with that and the always-atrocious factory brake dust, I would be very interested in disc/caliper/pad combos which will fit inside the factory 16" rims.
In the absence of any authoritative responses to my question, I will do some experimenting with the few calipers and discs I have kept over the years, but if your criteria is to keep the 16" rims, then I think you might be limited to the two pot Brembo comme ci:

Problem 'might' be that the two pot is no more efficient than the single piston. Single piston calipers are the norm now. I question the one MB uses on the SLK. My Audi A3 has single piston calipers and it stops on a sixpence. I think at the very least, the necessary upgrade, unless I am told otherwise, will be to a four pot:

But this will require 330mm discs from memory which will take you up to 17"..
As already said, if you are hitting ABS, your brakes are fine. Do not forget, you have a 280 in a small car; this is going to be much more lively than a 230 and yes, you will be using it as such.
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#7 Old 03-04-2014
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I also checked tire pressures and found the fronts were two pounds low, even by the "normal driving" standard on the fuel filler door. The rears were correct. I pumped them all up to the high speed/heavy load pressures and will run them that way for a while. The tires are Conti ExtremeContact DW, so pretty good rubber. I still might give a look to those two-pot Brembos later on; they certainly look prettier than the stock calipers on the car.
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#8 Old 03-05-2014
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Hal,

I've found our 200k brakes to be really good and as a comparison to be at least as good as my BMW 5 series.

If I were you I'd look at your particular system closer. Pads, discs, brake lines, fluid reservoir servo etc before simply replacing the calipers.

The calipers will probably be the most expensive component of your system and the problem will almost certainly lie elsewhere.....!

You're gonna be upset if you pay top dollar (ok Euro) for nice new calipers and your braking efficiency doesn't improve.
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#9 Old 03-05-2014
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I have a sport package with 330 front rotor and 4 pistons calipers as the second photo. I change all the brake system with the amg 55, and the different is very big.
Ass wooly wrote if ABS is kicking in sooner than you expect, your tyres have less grip than you would expect. Nothing that can be improved by putting 'better' brakes on it. Change your tyres!
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#10 Old 03-05-2014
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Yes, I must admit to being a bit harsh on the brakes! I have hardly used the car and the bit that I did use it, they were not good. However this morning I went out and for no reason, gave the brakes a single but small pump and that brought them up to how I would have expected them to be! So, some air in there somewhere methinks..!

Stefan - thanks! exactly what I wanted to know. Do you still have the sport pack calipers? Would you be kind enough to post a photo of the back of the caliper to show the mounting holes please? Brembo made two variants of this caliper for MB, one with longer legs for the mount that was used on the S class, C32 and some of the E models, and another with a flat more stubby mount that was used on the ML. I imagine yours is the former, but with Mercedes you never know!
On your sport package - what were used for your rear brakes? Again, would you post a photo please?
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#11 Old 03-05-2014
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Quote:
Originally Posted by Hal Adams View Post
Craig
Yes, I must admit to being a bit harsh on the brakes! I have hardly used the car and the bit that I did use it, they were not good. However this morning I went out and for no reason, gave the brakes a single but small pump and that brought them up to how I would have expected them to be! So, some air in there somewhere methinks..!

Stefan - thanks! exactly what I wanted to know. Do you still have the sport pack calipers? Would you be kind enough to post a photo of the back of the caliper to show the mounting holes please? Brembo made two variants of this caliper for MB, one with longer legs for the mount that was used on the S class, C32 and some of the E models, and another with a flat more stubby mount that was used on the ML. I imagine yours is the former, but with Mercedes you never know!
On your sport package - what were used for your rear brakes? Again, would you post a photo please?
Give me some minutes!
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#12 Old 03-05-2014
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Lets SEE some details!!
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#13 Old 03-05-2014
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#14 Old 03-05-2014
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The next week I will have same photos from https://www.slkworld.com/slk-parts-sa...ml#post1137682
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Thanks very much Stefan - all clear now. The front four pots are not the ones in my second photo but the smaller version and the rears are the same as stock.
I have just made the association - you posted your big Brembos on MBworld, yes? Have you sold them yet? I would have been interested, but apart from them being too over the top for what I want, I do not know enough regarding compensation that might be required on the master cylinder and/or the sensor pump.
Thanks agin for the photos, they helped me to understand how they braked the 171.
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#16 Old 03-06-2014
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Quote:
Originally Posted by Hal Adams View Post
Thanks very much Stefan - all clear now. The front four pots are not the ones in my second photo but the smaller version and the rears are the same as stock.
I have just made the association - you posted your big Brembos on MBworld, yes? Have you sold them yet? I would have been interested, but apart from them being too over the top for what I want, I do not know enough regarding compensation that might be required on the master cylinder and/or the sensor pump.
Thanks agin for the photos, they helped me to understand how they braked the 171.
Yes I have posted to MBworld.The next days I will sell them to ebay.
They are in perfect condition, check the thickness of the rotors!
I cannot understand ''I do not know enough regarding compensation that might be required on the master cylinder and/or the sensor pump" what means
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#17 Old 03-06-2014
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Quote:
Originally Posted by stefan View Post
I cannot understand ''I do not know enough regarding compensation that might be required on the master cylinder and/or the sensor pump" what means
If you have the same amount of force going to the front and rear brakes, the rear wheels will lock before the front, due to weight transfer. To get around this, there is a compensation system that allows more braking effort on the front than the back This is set up, according to the weight of the car.

Because a 55 is heavier than a 200, more braking effort will be transferred to the front wheels than the back. If you transfer the brakes from a 55, you MIGHT have to adjust the compensation accordingly.






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#18 Old 03-06-2014
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Originally Posted by Woolly View Post
If you have the same amount of force going to the front and rear brakes, the rear wheels will lock before the front, due to weight transfer. To get around this, there is a compensation system that allows more braking effort on the front than the back This is set up, according to the weight of the car.

Because a 55 is heavier than a 200, more braking effort will be transferred to the front wheels than the back. If you transfer the brakes from a 55, you MIGHT have to adjust the compensation accordingly.
I havent any problem. The car brake force system is like "X" The front right with rear left, and front left with rear right.
Also you change all the package, so the proportional force is the same (all the brake have more force, bigger rottors, bigger callipers etc).
Finally If you check the slk 200 with or w/o sport package have the same parts (except front rotors and calipers)

I am selling in the package the brake pump from slk55!!
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Originally Posted by stefan View Post
I havent any problem. The car brake force system is like "X" The front right with rear left, and front left with rear right.
Also you change all the package, so the proportional force is the same (all the brake have more Force, bigger rottors, bigger callipers etc).
Finally If you check the slk 200 with or w/o sport package have the same parts (except front rotors and calipers)
I understand that - I thought you asked what 'brake compensation/bias' was






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I understand that - I thought you asked what 'brake compensation/bias' was
ok! My mistake I did not realize what talking about
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