Vibration under braking.

[bkreigsr]

We took our 2013, 535 on a 1,100 mile (round trip) this month and the front end started to vibrate under braking.

Kinda felt like wheel bearings, but the dealership checked them last month....
Kinda felt like one of the front rotors was warped...
Kinda felt like the anti-lock brakes were acting up...

Some of the braking from highway speed (75-80) was particularly violent - like the ball joints were loose. (they are not - I checked that today in the driveway)
Around town the car is very well-behaved.

Is there a common area of concern in these models that would generate this symptom?

(The car only has 43,000 miles - always dealer maintained.)

Thanks in advance
Bill K

[Matt at Pelican Parts]

Yes, actually that condition is a common concern with many modern bmws. There is a pretty good chance your control arm bushings are worn out. I believe its usually the front ones that go. You can save some money by pressing new bushings in, or alternatively the entire arms can be purchased with new bushings. Of course I do want to mention you should also investigate the brake rotors. As with most vehicles, lots of heat cycles can cause rotors to warp which will also cause these conditions.

-Matt

[bkreigsr]

Thanks Matt - I crossed posted to the off 'topic forum' on the Porsche BBS.

I'm hoping that the calipers are not in need of replacement.

Rotor warp, and control arm bushings were mentioned most often.

Bill K