shervinj

Hi Guys,

I have a 2005 530i with 85K miles

I have only had it a month and a half so all of the sounds the car makes are all new.

I know i just hit the change rear brake pads notification on the car. Front pads have 1K left on them so they all need to be changed soon.

Out of nowhere I started hearing this slight thumping sound when decelerate. the slower I go the less frequent it is.I immediately thought maybe it was the brakes telling me to change them but I noticed it happens even when I don't apply the brakes.

It isn't a loud thump. At first I never noticed it because of the radio. I was hoping it would go away after a few miles but it hasn't.

The only thing I have done tot he car was take all the rims off and dip them. I then put them back and rotated them front to back. I then had the air adjusted to match the prescribed pressure.

We had some health issues with my mom so I have not had a chance to take it in to get looked at. No warnings have popped up on my screen so I was wondering if this can wait a few days.

Curious your thoughts.

Also anyone want to tell me the way to go with brakes?

I know I will need pads. Do I need rotors every time? This is the first time I have heard a car needing that. I need brake sensors too right? Never heard of needing these also.

I know people have mentioned there is a brand that actually is a supplier for BMW that starts with a T. Is that what you all get?

Hyper_545i

First though that comes to mind is this is being caused by the tires. I assume this sound did not exist prior to dipping the wheels and rotating? Can you put the tires back the way they were and see if the sound is gone? Could be a balance issue as well. Could one of the front rims have a bend in it and it is more pronounced after you moved it to the back?

BMW recommends the rotors be replaced and not cut or resurfaced. Depending on the mileage of the rotors, not a bad idea to replace them, unless they are relatively new.

There is one sensor for the front and one for the rear.

The Pad you are referring to I believe is Textar. Pagid I believe is another OEM Manufacturer. I know a lot of folks use the Akebono's or other low dust brake pads. The only trade-off is the lack of initial bite with the brakes. I prefer the OEM feel, even if it means I need to clean the wheels more often. This is a matter of personal preference.

Hope some of this helps you. Sorry to hear about mom. Hope all is well.

twh

You need new rotors if the are below minimum thickness. The min thickness is stamped on the rotor. As I recall, you can see it when you take the wheel off. I think it is 18.4 mm for the rear. If you don't have one already, get a cheap micrometer from Sears or a hardware store -- should be about $17.

shervinj

Do we all have a go to online vendor for brakes, etc?

twh

My most recent job was wife's X5 rear brakes. Got all the parts at autohausaz.com. Choose Zimmermann rotors.

AutohausAZ-Mike

Thanks for the shout out, twh!!

handyben

Check your wheel bolts, make sure they are all tight!