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00 E39 M5; 07 E64 M6; 11 E70 X535D
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Discussion Starter #1
Hey All,

I have a 2007 E64 M6 with 46K miles on her. I have noticed over the past few months that when I break hard it pulls to the right (Passenger Side). I have not noticed any more brake dust on the Driver side or Passenger side of the wheels. The temperatures are about the same, as well. I did a brake fluid flush and no change. The suspensions seem to all look well. I will be checking out the driver side caliper this weekend or next and I will look at the passenger side, as well. Do you all think it is most likely the caliper sticking?

Any other thoughts will be great!

Thank you,

Chris
 

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Yeah, my first thoughts were the other side caliper isn't engaging for some reason. I'd remove tire and caliper and see if it slides easily. make sure pads are not caked up with brake dust and not able to slide. if all that looks good, may be time to pull the hose off and make sure nothing clogged, which doesn't sound like it if you were able to get a succesful brake flush. are your brake pedals tight? not spongy? push to resistance and stay there at some final stopping point?
 

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00 E39 M5; 07 E64 M6; 11 E70 X535D
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Discussion Starter #3
Yeah, my first thoughts were the other side caliper isn't engaging for some reason. I'd remove tire and caliper and see if it slides easily. make sure pads are not caked up with brake dust and not able to slide. if all that looks good, may be time to pull the hose off and make sure nothing clogged, which doesn't sound like it if you were able to get a succesful brake flush. are your brake pedals tight? not spongy? push to resistance and stay there at some final stopping point?

Thank you for the reply.

The brakes are not spongy and work well other than pulling to the right most of the time.

Today my mate and I were able to take a look at the front brakes.

With the front off the ground both tires spind fine. My buddy pressed the break and both tires did not move. Then he released the brake and both tires moved, as they did before.

Visual inspection pads are wearing the same on both sides. Disc are in great shape. No extra brake dust on either side. Nothing seems to be out of place.

Any other thoughts?


Chris
 

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if your brakes are checking out ok, you might look for loose suspension parts. like a tie rod or some other item that is allowing the car to pull when the brake engage. car is in motion, suddenly a backwards braking force causes loose suspension part to cause car to get out of alignment and car veers in that direction.
 

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00 E39 M5; 07 E64 M6; 11 E70 X535D
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Discussion Starter #6
if your brakes are checking out ok, you might look for loose suspension parts. like a tie rod or some other item that is allowing the car to pull when the brake engage. car is in motion, suddenly a backwards braking force causes loose suspension part to cause car to get out of alignment and car veers in that direction.
Either side? or more likely on the right side since that is where the problem is coming from?

check the suspension thoroughly for any loose components
Any item in particular?

Thank you.
 

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p.s. if it does turn out to be a suspension part, be sure to read the TIS on instructions. some such as control arms require car to be at ride height and under load before final torque is applied to bolts.
 

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Discussion Starter #9
Around your milage, control arm bushings are known to get loose. I'd check those and tie rods for started, but look at everything up front.

There was some play in the bushings. I will go ahead and replace both sides, would you replace anything else? Also, do you use OEM again or would you use any other brand bushing?
 

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I use BMW if price is same, otherwise Lemforder for the most part. I think Lemforder is OEM supplier, and have heard TRW is as well. In fact, I think my coupe says TRW on something, may have been a control arm. was cleaning things up down there the other day and noticed by a quick glance. Its got 36K on it, so probably still factory.

You can replace those bushings with a special tool and not need to remove the whole control arm off car. At 48K I'm thinking your in no-mans land. If you were at 80K I would replace all suspension parts. I just rebuilt the entire suspension on my E60 which had 80K. Everything was not nearly as tight as the new parts, even tho I was not experiencing any issues. I'd say biggest bang for the buck was sway bar bushings and easy to do. But everything adds up to a tighter suspension. Be sure to note in TIS which bolts/nuts should be replaced as well.

My DIY thread:
 
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