Rear brake/suspension issue
Thread Starter
Super Member
Joined: Jul 2015
Posts: 793
Likes: 22
From: NY
2001 Porsche 911 Turbo (heavily modified)
Rear brake/suspension issue
Whats up guys?
I searched but couldnt find another person with this issue. In the heat of summer or after spirited driving I used to get a intermittent clicking/clunk on the rear passenger side upon light braking under low speeds. Now it has become much more annoying and worrysome as it sometimes sounds like something snapping back into place. I feel like it could be a loose pad in the caliper or sway/suspension part moving? Only does it stopping at low speeds (ala parking lot) and only going forward for some reason. Occurence increases after hard driving as well.
Any ideas before I go to dealership this week?
I searched but couldnt find another person with this issue. In the heat of summer or after spirited driving I used to get a intermittent clicking/clunk on the rear passenger side upon light braking under low speeds. Now it has become much more annoying and worrysome as it sometimes sounds like something snapping back into place. I feel like it could be a loose pad in the caliper or sway/suspension part moving? Only does it stopping at low speeds (ala parking lot) and only going forward for some reason. Occurence increases after hard driving as well.
Any ideas before I go to dealership this week?
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Joined: Jun 2008
Posts: 8,074
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From: Los Angeles
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
I have the same thing. Mine is pretty loud, most noticeable when I'm in my parking garage and changing from Drive to Reverse. Does yours get extra loud in the transition from forward to back? I'm sure my brakes are totally fine. I think it's the pads moving around in the caliper if I had to guess.
Thread Starter
Super Member
Joined: Jul 2015
Posts: 793
Likes: 22
From: NY
2001 Porsche 911 Turbo (heavily modified)
I have the same thing. Mine is pretty loud, most noticeable when I'm in my parking garage and changing from Drive to Reverse. Does yours get extra loud in the transition from forward to back? I'm sure my brakes are totally fine. I think it's the pads moving around in the caliper if I had to guess.
Benz shop said they can have their AMG guy take a look for me tomorrow morning. If its just the pad floating around I am hoping swapping pads will help. If not, I wonder if its a little air in the lines or something.
Did you ever have yours checked out?
MBWorld Fanatic!
Joined: Jun 2008
Posts: 8,074
Likes: 2,867
From: Los Angeles
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Nope. I tested by braking repeatedly from 150mph about 200 times 
- I've had 4 track days this year, and the brakes have been flawless. Switched pads to Carbotech XP12, and they still make just as much clanking noise (by the way, only the rear brakes do this) going from D to R and vice versa. I'm 95% sure it's just play in the pads, as there's nothing loose back there and the brakes work fine.
If the car is driving, braking and handling fine, I'd just chalk it up to another one of those noises we all have to just get used to.
- I've had 4 track days this year, and the brakes have been flawless. Switched pads to Carbotech XP12, and they still make just as much clanking noise (by the way, only the rear brakes do this) going from D to R and vice versa. I'm 95% sure it's just play in the pads, as there's nothing loose back there and the brakes work fine.If the car is driving, braking and handling fine, I'd just chalk it up to another one of those noises we all have to just get used to.
Thread Starter
Super Member
Joined: Jul 2015
Posts: 793
Likes: 22
From: NY
2001 Porsche 911 Turbo (heavily modified)
Nope. I tested by braking repeatedly from 150mph about 200 times - I've had 4 track days this year, and the brakes have been flawless. Switched pads to Carbotech XP12, and they still make just as much clanking noise (by the way, only the rear brakes do this) going from D to R and vice versa. I'm 95% sure it's just play in the pads, as there's nothing loose back there and the brakes work fine.
If the car is driving, braking and handling fine, I'd just chalk it up to another one of those noises we all have to just get used to.
- I've had 4 track days this year, and the brakes have been flawless. Switched pads to Carbotech XP12, and they still make just as much clanking noise (by the way, only the rear brakes do this) going from D to R and vice versa. I'm 95% sure it's just play in the pads, as there's nothing loose back there and the brakes work fine.If the car is driving, braking and handling fine, I'd just chalk it up to another one of those noises we all have to just get used to.
Im sure Benz dealer will tell me "normal play in rear" If so, at least its documented and Ill just go about my business.
Still trying to find that sponsor that was selling Porterfield pads (heard these are best balance of bite/less dust) on here for a good price so I can swap out.
MBWorld Fanatic!
Joined: Jun 2008
Posts: 8,074
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From: Los Angeles
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
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Thread Starter
Super Member
Joined: Jul 2015
Posts: 793
Likes: 22
From: NY
2001 Porsche 911 Turbo (heavily modified)
MB Foreman drove car and reproduced the sound. Said it seems to be lube in the rear right caliper may be wearing out and its just pad getting stuck and slapping back into place. Inner pad may be low as well and told me if I wanted to swap pads anyway, just do that first and have shop grease up everything and see if sound goes away. May be better than having him take everything apart just for it to be taken apart again. I told him as long as its not a safety issue Im good. He said no issue.
Good to go.
BLKROKT, thanks for the advice. Do you also say Porterfield are the best balance brake pad for our cars?
Good to go.
BLKROKT, thanks for the advice. Do you also say Porterfield are the best balance brake pad for our cars?
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