Doing brakes on SLK 55 AMG, need some advice - Mercedes Benz SLK Forum

Tires, Wheels, Brakes & Suspension Discussion and information regarding tires, wheels, brakes and suspension.

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#1 Old 06-11-2019
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Question Doing brakes on SLK 55 AMG, need some advice

Haven't done them on this car yet, so looking for info.

Seems like I should get ceramic pads to get rid of the brake dust problem, what has the group had success with? I see quite a few on Amazon, not sure what's a good choice.

Rear
Front

Do I need to replace the Electronic Wear Sensor for the brake pads? I'm getting the warning in the dash to check my pads.

Any hints or tips (or manual pages!) on doing the change? Special tools required? I've done pads on other cars before, and have a decently stocked garage, so I'm not completely ignorant, just wondering about any "gotchas". I did see how to set the service position for the rear brakes. I did search the site for brake pad info but really didn't come up with much.

Thanks in advance!
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#2 Old 06-11-2019
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getting warning,so sensor working, i would not replace it


so just replacing pads, not rotors?

Here is my r171 55 brake replace thread


https://www.slkworld.com/tires-wheel...o-pads%85.html


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#3 Old 06-11-2019
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Jeff's set you in the right direction.

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#4 Old 06-11-2019
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Quote:
Originally Posted by jbanks15 View Post
getting warning,so sensor working, i would not replace it




If you are getting pad warning light, then that means pads have worn down enough for the sensor to be making contact with the disk.


This will wear away the sensor, and weaken it...(depending on how long the warning light is ignored) so I would replace both wear sensors. Not expensive


They can also be difficult to remove, so save the hassle and replace them.
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#5 Old 06-11-2019
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Quote:
Originally Posted by G0RSQ View Post
If you are getting pad warning light, then that means pads have worn down enough for the sensor to be making contact with the disk.


This will wear away the sensor, and weaken it...(depending on how long the warning light is ignored) so I would replace both wear sensors. Not expensive


They can also be difficult to remove, so save the hassle and replace them.
We talking 55 here right?

Sensor is electronic, no? so what is to wear away or weaken?
Plus the 55 has only one front sensor, not 2...


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#6 Old 06-11-2019
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jbanks15,
I looked for an image in google to explain but couldn't find one. That's the way these pad sensors work - they are destroyed when they're triggered. You can re-use them if you replace your pads before the sensor triggers, but not after.


OP,
Good news: the sensors are cheap and commonly available. Bad news: there were several incompatible variants. I suggest taking your old pads and sensor(s) with you when buying new pads and sensors.
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Quote:
Originally Posted by efair View Post
jbanks15,
I looked for an image in google to explain but couldn't find one. That's the way these pad sensors work - they are destroyed when they're triggered. You can re-use them if you replace your pads before the sensor triggers, but not after.


OP,
Good news: the sensors are cheap and commonly available. Bad news: there were several incompatible variants. I suggest taking your old pads and sensor(s) with you when buying new pads and sensors.
A 211 540 17 17
BRAKEPAD WEAR SENSOR
BRAKE LINING WEAR INDICATOR
Code: M113+M55;
Quantity: 1

Thanks but he said 2 wear sensors....55s only have 1

it says electronic sensor...so how is an electronic 'used up'?


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#8 Old 06-12-2019
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Quote:
Originally Posted by efair View Post
jbanks15,
OP,
Good news: the sensors are cheap and commonly available. Bad news: there were several incompatible variants. I suggest taking your old pads and sensor(s) with you when buying new pads and sensors.
Ok, I'll pull them off and look for a replacement when I have them in hand. I bought the TRW ceramic pads and they are stated to fit my vehicle, so hopefully they do. I'd order the sensors online too, but that seems a bit more dicy apparently?
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#9 Old 06-12-2019
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Where did you order the TRW pads from?


Probably the safest thing to do is to order the pads and sensor from the same vendor, and ask them to ensure they fit before shipping them.
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#10 Old 06-20-2019
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Quote:
Originally Posted by efair View Post
Where did you order the TRW pads from?


Probably the safest thing to do is to order the pads and sensor from the same vendor, and ask them to ensure they fit before shipping them.
Yeaaaaaah, well I had to order from two different vendors on ebay to get them here in a reasonable (less than 1 month!) time. I guess I'll find out soon on the sensors as I'll be starting on them on Friday. Hopefully the "widely availible" means I can get them at my local auto zone. If not there are several MB stealerships in town that I can get them from.
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#11 Old 06-20-2019
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I bought mine at OReillys.
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#12 Old 06-21-2019
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Quote:
Originally Posted by jbanks15 View Post
it says electronic sensor...so how is an electronic 'used up'?
Electronic brake pad sensors normally have a wire coiled up inside a plastic piece. As the pad wears down it shortens the coil and changes the resistance. It does indeed get used up. If you change the pads early then you don't need to replace the sensor as it isn't worn down all the way yet.
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#13 Old 06-22-2019
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Ok, one last question: anyone have any tightening torques they can share with me?

As for wheel torque, holy cow. Firestone put my new tires on and I needed to put a 5' cheater bar on the lug wrench to break them free. Every one of the lugs "pinged" and a couple of them "pinged" twice! I wonder how many darn ft-lbs they put to them. I was seriously concerned I was going to break off a stud.

Glad I got my garage cleaned out a bit so I can do this under cover. The heat index is killing me today: backyard weatherstation
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#14 Old 06-22-2019
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110 nm for R171, 130 nm for R172.
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#15 Old 06-22-2019
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Quote:
Originally Posted by efair View Post
110 nm for R171, 130 nm for R172.
Awesome, thank you very much!

Ended up having to get one of these to compress the piston:



With all the stuff on the back of the caliper, a C-clamp was out of the question. Worked great, albeit $40 for a rarely used tool.
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#16 Old 06-23-2019
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So, the rear brakes are done. Checked the front, they probably have 33% remaining and it's just too hot out to do work that isn't immediately necessary. I think the heat index topped out at 118° F yesterday and it was no fun. I took some pictures to clear up some confusion above.

First off, the R172 SLK55 AMG has two brake wear sensors, passenger side, front and rear. They are located on the inboard pad. They only give you a warning when they contact the rotor, and therefore if you have a light, you should replace them. Yes, you can put them back in, but then you will get that much less warning the next time your brakes wear down. This is what mine looked like on the right rear. You can see where it's been worn down.



The sensors are $9/ea and I got mine at o'reillys. Fit perfect with my TRW pads



Close up



Backs of the pads that came off





Also, don't use cheap chineseium 3/8" extension and then attempt to put 100 ft-lbs on them

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