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AMG C43 Rear Brakes

 
Old 12-17-2018, 01:24 PM
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Unhappy AMG C43 Rear Brakes

I'm attempting to replace the rear pads and experiencing a problem. I've released the electronic parking brake, fully retracted the caliper piston and replaced the rotors. However, now I can't get the pads over the rotor and having an extremely difficult time keeping the pads straight as I attempt to mount them because of the 2 piece caliper. Are there any tips on how to accomplish this generally easy task?

Thanks,
Theflynkd

Last edited by theflynkd; 12-17-2018 at 01:27 PM.
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Old 12-17-2018, 02:02 PM
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My only guess is that you still don't have the caliper fully compressed. I would imagine fresh rotors and pads would be tight, but not so much so you can can't reassemble. Did you apply any additional pressure to the calipers, or only go through the electronic retraction procedure?
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Old 12-17-2018, 04:12 PM
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Compress the pistons.

I just did mine and nowhere does it say anything about the fact that you have to push the caliper pistons back after you retract them using the service menu on the dash. Piece of cake once you add the extra step. Pistons push back easily with a small c clamp.
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Old 12-17-2018, 04:14 PM
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AMG C43 Rear Brake

Prior to posting I attempted to compress the piston again to ensure they were fully compressed (I have a compression tool), and even opened the bleeder valve to reduce pressure, thinking that may have been the problem to no avail. Also finding it difficult to handle the two piece caliper to hold the pads, any suggestions on that?

Last edited by theflynkd; 12-17-2018 at 04:18 PM.
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Old 12-17-2018, 04:14 PM
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did you go in secret menu in dash to fully retract rear brakes?
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Old 12-17-2018, 04:14 PM
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Pads

One more note. I was able to get a ceramic lower dust pad from Advance auto parts. After to order but came in 2 days.
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Old 12-17-2018, 04:17 PM
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Link to how to retract rear brake piston

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Old 12-17-2018, 05:37 PM
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Yes, I released the parking brake from the dash display, also calipers are the floating type with pistons must be screw turned to retract after parking brake release.

Last edited by theflynkd; 12-17-2018 at 05:46 PM.
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Old 12-17-2018, 05:38 PM
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The rear caliper piston on the '17 C43 must be screwed turned vice pushed.

Last edited by theflynkd; 12-17-2018 at 05:46 PM.
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Old 12-17-2018, 05:39 PM
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Yes I did the secret menu thing in dash to fully retract rear brakes, it doesn't fully retract the pistons, the rest of the piston must be screw turned to retract.

Last edited by theflynkd; 12-17-2018 at 05:49 PM.
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Old 12-17-2018, 07:28 PM
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Originally Posted by boxster88 View Post
One more note. I was able to get a ceramic lower dust pad from Advance auto parts. After to order but came in 2 days.
Did they have ones for the front also?

What kind did u get?

How much?
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Old 12-17-2018, 11:14 PM
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Only have the tears available. I bought the platinum ceramics. Only $41 with discount code. So far so good but only put 50 miles on them so need more time to test dusting.
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Old 12-17-2018, 11:15 PM
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Typo. Tears not tears.
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Old 12-17-2018, 11:16 PM
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Rears. Computer keeps changing the word.
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Old 12-18-2018, 02:00 AM
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Did you use an actual rear caliper tool to depress them?
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Old 12-18-2018, 06:57 AM
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Originally Posted by boxster88 View Post
Only have the tears available. I bought the platinum ceramics. Only $41 with discount code. So far so good but only put 50 miles on them so need more time to test dusting.
O ok thanx
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Old 12-18-2018, 07:35 AM
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Try a c clamp or caliper tool. Pistons push back very easily. They cannot be screwed back.
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Old 12-19-2018, 11:11 PM
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Place the calipers into Fitting Position. Make sure you hear the actuator releasing or you can damage it by compressing. The cluster should say 'FITTING POSITION REACHED'.
Then while you have the pads off you can compress the piston.
They are tight fitting some times, but I usually find that if the caliper is not just right, the parking brake actuator will be against the upper slide mount and cause it to be slightly angled. This will cause binding while trying to place the caliper over the pads.
If moving the actuator around and verifying it isn't touching the caliper bracket, I sometimes just place the piston against the inner pad and compress the piston (squeezing with my hands) until there is just enough clearance to slide on. After it's on, it usually moves freely and makes you think "why the..."
Be sure to 'EXIT FITTING POSITION' in the instrument cluster afterwards.
Good luck and there really isn't any tricks to this.
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Old 12-20-2018, 07:21 AM
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I assumed from the first post in this thread that the electronic retraction had been done already. The post from redsly outlines the procedure that I followed but I simply used a c clamp to push the piston back all the way.
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