Front brakes and sensor replaced check control still on

[Joe's E70]

Ok I just recently bought my 07 e70. The dealership replaced the front pads but did not replace the sensor. So I replaced the sensor today and everything reset. I went for a test drive and my brake light came on again as well as the replace brake pad message on I drive. Now I was able to reset the front brake warning when I changed the sensor. Everything is ok under my service requirements too. Why is my brake warning light still on and why do I have my check control message saying replace brake pads? Thanks for any help guys. Btw I love my new e70

So I came home ripped the wheel off again made sure everything was looking good. I started the car with the wheel off and no brake light warning. Put the freaking wheel back on dropped the car started it and the lights back on? What the hell??

[bawareca]

It has to be reset with the proper tool. It was probably a used car dealership that didnt replace the sensor and they probably installed a lifetime pads
Also you may have worn rear pads too. And if you install aftermarket sensor the light may not go away.

[lanbrown]

Makes you wonder if they checked the rotors at all or if they resurfaced them. I would check the job that they did. Check the rotor thickness and the pads at all four corners.

[ard]

Originally Posted by Joe's E70

So I came home ripped the wheel off again made sure everything was looking good. I started the car with the wheel off and no brake light warning. Put the freaking wheel back on dropped the car started it and the lights back on? What the hell??

But guys, see his last part...what explains this?

[lanbrown]

Maybe the reason why they kept the sensor off? A short somewhere upstream of the sensor or even the connector itself?

[Ron07x5]

Originally Posted by ard

But guys, see his last part...what explains this?

Something goes good with with the wheel off because it acts as.it.should and goes bad when the wheel is on. I suspect a connection for brake sensor opens when you hang the wheel on? I would play wheel on and wheel off and look at stress on sensor connection. Should have to tighten lugs? Something electrical-signal changes with the wheel present and you must find that.

I am paying interested attention here because I bought a 07 x5 this month and I see it's service computer says I need to do both front and back brakes in under 5000 miles. Curious it has been saying exactly the same miles for the almost 3000 miles I have driven it. Will be checking pads maybe today.

[Ron07x5]

Originally Posted by trader4

Assuming of course that the wheel on/off thing is repeatable. So far,
all I see is he said it happened once, which doesn't prove much of
anything. Could just be a coincidence. As I said, I'm curious about
the dealer changing the pads, but not the sensor? Was the light on
when it went in? If so, why did the dealer leave the light on, etc.
I would think most dealers would just change the sensor as part of
the pad replacement, even if they were not worn down to trip it.

You are.right .... if he can repeat.the problem only when hanging a wheel then he is onto a problem .... so first test this case. Then if problem still exists consider if has not been properly reset or.there is some devious explanation to bmw service not replacing the old.sensors. it is out of bmw character to not replace everything but perhaps it was the dealership money and not the customers?

[Ron07x5]

If he must put back.the old sensors.and.see.if.things are.then good. Yep it.is detective time and eliminating the easiest things first is.the way to.go.

[lanbrown]

Guys! He never said it was a BMW dealer, he just said dealer. This is what he said:

Originally Posted by Joe's E70

Ok I just recently bought my 07 e70. The dealership replaced the front pads but did not replace the sensor. So I replaced the sensor today and everything reset. I went for a test drive and my brake light came on again as well as the replace brake pad message on I drive.

So he was alerted two ways. The sensor is a two step sensor; the first changes the resistance and second is just open. It sounds like it is going to open which is probably why there is no sensor. A previous owner didn't want to pay to diagnose it or they did and didn't want to pay to fix it.

To the OP, you are going to have to check the connector as suggested in post #5 and possible the through the entire path to the module. Look at the connector first.

[Joe's E70]

I bought the car from a non bmw dealer. I think they replaced the pads before the mileage was up on the sensor. I am going to play around with it again in the morning. I bought the sensors off of eBay. I'll take the wheel off again and see if it goes away again. The rotors look fine also. I inspected the pads and they are new. I will post my findings in the morning. Thanks everyone for your help