[klasjdh]

I have not been able to drive my used 2016 435i x for 3-4 weeks due to the virus epidemic. As a result, when I started to drive it today, I noticed that there was something immediately wrong with the brakes being stiff and wonky.

But after driving the car for around an hour, the braking issue became less pronounced and improved somewhat.

After driving the car, I took some pictures of the brakes / calipers. Should I be concerned about this? Should I bring it in the dealership to get this taken looked at?

Also I just noticed after taking the pictures that the 2 front wheels have this metal cover that encases the calipers, but the two back wheels do not (as shown in the last picture, sorry I forgot to take pictures of the front two wheels' brakes / calipers.

What do you think would be the best solution to remedy the situation?

Thanks!








photos are clickable links for larger images.

K

[DreamerJoe]

rust build up happens on the rotors but will go away after some driving, the build up on the caliper itself you are going to want to try and clean. next time you wash your car just spend a little more time there, maybe use a plastic bristled brush with a short handle that will give you some reach. not something to be too worried about or requires a dealer visit.

[klasjdh]

Originally Posted by DreamerJoe

rust build up happens on the rotors but will go away after some driving, the build up on the caliper itself you are going to want to try and clean. next time you wash your car just spend a little more time there, maybe use a plastic bristled brush with a short handle that will give you some reach. not something to be too worried about or requires a dealer visit.

So do you think that rust build attributed to the strange feeling I got when I was using the brakes after not driving it for a couple of weeks? Like this undulating feeling almost like bumps that are not smooth, from what I used to remember.

[DreamerJoe]

Originally Posted by klasjdh

So do you think that rust build attributed to the strange feeling I got when I was using the brakes after not driving it for a couple of weeks? Like this undulating feeling almost like bumps that are not smooth, from what I used to remember.

could be you were feeling the rust on the rotors before the friction removed it, kind of like when you have a warped rotor the feedback can transfer and be felt in the pedal. after it rains and my car sits for a few days I get rust build up on my rotors, it always goes away but I've never felt anything in the pedal. it went away though right? I didn't drive my car for maybe 10 days and it had a rough first start, but it's been fine since.. if the issue was persistent I would be concerned, but first time driving the car after a certain amount of time sitting and then acting fine after I wouldn't worry.

[zole2112]

What they said...rust.

[cfm56d7b]

It could very well be rust combined with glazed rotors / pads + something else.

There isn't a need to take the car to the dealer. Reputable indy shop can inspect the brakes and give you an accurate assessment. Better be safe.