Completely baffled! brake caliper is sticking, but it's not the caliper. - MBWorld.org Forums

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Completely baffled! brake caliper is sticking, but it's not the caliper. > Completely baffled! brake caliper is sticking, but it's not the caliper.
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Completely baffled! brake caliper is sticking, but it's not the caliper.

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Old 08-11-2017, 09:26 AM
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Completely baffled! brake caliper is sticking, but it's not the caliper.

I'm trying to loan my 99 ml320 to a family that needs a car right now, but the right front brake is overheating. I think it's been going on for a while because one pad on that side got down to metal before I knew any thing was wrong.

First thing I did was new oem pads and rotors. They drove the car and within 40 minutes the passenger side front was overheating and they could smell it. Had to tow it home. Since then I've had the caliper apart twice and replaced the rubber brake line. The problem is definitely somewhere upstream.

I have star, but I'm not very good with it. The only code I found that might be relevant was something about the steering angle sensor not initializing. Maybe the ABS is confused? I would expect something on the dash if that were true.

If you guys have any insight it would be much appreciated!

320,000 miles
4JGAB54E9XA141456
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Old 08-12-2017, 05:45 AM
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The caliper piston is not retracting after brake application.

Replace the caliper.
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Old 08-12-2017, 07:38 AM
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I wish it was that simple. I've had the caliper apart twice. I've even sanded and repolished the piston,(some kind of weird brown material over aluminium) Everything is clean and smooth and perfect. No sticking.

I did find something about the brake control module with star. I've got it written down somewhere, I'll post it later. I haven't figured out how to clear old codes, so I never know what is relevant.
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Old 08-12-2017, 05:27 PM
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It said: All Activity Module No CAN reception from ETS??
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Old 08-13-2017, 04:44 AM
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Originally Posted by StarvingArtist View Post
I wish it was that simple. I've had the caliper apart twice. I've even sanded and repolished the piston,(some kind of weird brown material over aluminium) Everything is clean and smooth and perfect. No sticking.

I did find something about the brake control module with star. I've got it written down somewhere, I'll post it later. I haven't figured out how to clear old codes, so I never know what is relevant.
Try to be a little more helpful. You mention codes but do not say what the codes are.

Post the code numbers.
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Old 08-13-2017, 07:20 AM
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I'll get star plugged back in this afternoon, and get more specific. Thanks!
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Old 08-13-2017, 07:38 AM
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Originally Posted by StarvingArtist View Post
I'll get star plugged back in this afternoon, and get more specific. Thanks!

Make sure you read all modules.
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Old 08-14-2017, 08:27 AM
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I ran out of time. I cleared the history and the traction control and engine control wouldn't clear. then I did something wrong and the computer kept telling me it was busy with another program, then connection failed.

The car is currently driveable, that side is still dragging a bit, but not overheating.

I'll get some help with the star and try again tonight.

Thanks
Russ
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Old 08-14-2017, 07:48 PM
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BAS c1000 control module N48
N47-5 ESP

ESP C1000 control module
-046

The codes won't clear in these two, and the steering angle sensor won't initialize. The good news is that it's driveable now, maybe the caliper was just sticky. It's still running hotter than the other one though, and it really shouldn't. It is smooth and perfect on the bench.
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Old 08-15-2017, 01:13 AM
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You need to look for a replacement ESP module. C1000 indicates that it is faulty.
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Old 08-15-2017, 07:16 AM
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Originally Posted by art_arev View Post
You need to look for a replacement ESP module. C1000 indicates that it is faulty.
Any chance it could be the steering angle sensor?
It also said something about voltage supply to the control module in the list of possible causes.

Where is the stinkin thing, I'll wiggle the connections and check the fuses.

If I do need one, I hope it's plug and play.

I just found a pile of them on ebay. Not unreasonable prices either.

Last edited by StarvingArtist; 08-15-2017 at 07:23 AM.
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Old 08-16-2017, 07:26 AM
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Originally Posted by StarvingArtist View Post
Any chance it could be the steering angle sensor?
It also said something about voltage supply to the control module in the list of possible causes.

Where is the stinkin thing, I'll wiggle the connections and check the fuses.

If I do need one, I hope it's plug and play.

I just found a pile of them on ebay. Not unreasonable prices either.
The ESP Module is located in the fuse/relay box. Pull it up and copy down the number 163 545 xx xx.

It is plug and play if you buy a used one.

Do a search on ebay using the part # from your present module?

After installation, codes must be cleared.
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Old 08-16-2017, 02:18 PM
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Awesome! Thanks!

Any thoughts on the steering angle sensor? I'm surprised the traction control could even work without that. The dash would go nuts in my CLS.
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Old 08-17-2017, 05:38 AM
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Originally Posted by StarvingArtist View Post
Awesome! Thanks!

Any thoughts on the steering angle sensor? I'm surprised the traction control could even work without that. The dash would go nuts in my CLS.
Your problem has nothing to do with the Steering Angle Sensor.

Reset the SAS by centering the steering wheel, then turn all the way to one side and then the other, and then center the wheel.
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Old 08-17-2017, 06:21 AM
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Originally Posted by Maj. Dundee View Post
Your problem has nothing to do with the Steering Angle Sensor.

Reset the SAS by centering the steering wheel, then turn all the way to one side and then the other, and then center the wheel.
I'll order that control module.

I appreciate your help on this.

Thank you!
Russ

Last edited by StarvingArtist; 08-17-2017 at 06:25 AM.
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Old Yesterday, 07:56 AM
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Control module should be here any day. I did a dry run to see what it would take to swap. I hate to admit it, but I couldn't unplug the wires. Apparently the ebay seller had the same problem, because they just clipped all the wires. Anyone know how the things release? I could change this in minutes if I could unplug it without breaking something.
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Old Yesterday, 01:28 PM
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Take a close up picture of the connectors and I will explain.
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Old Yesterday, 05:46 PM
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Originally Posted by Maj. Dundee View Post
Take a close up picture of the connectors and I will explain.
Will do, thanks.
Turns out I should have paid more attention to the shipping. It's going to be here in a week.
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