[Aj6543]

I found the solution. I need to replace the solenoids.

https://www.bimmerfest.com/forums/sh...d.php?t=733273

Can someone help me find where I can purchase the solenoids from or which parts I need exactly.

Thank you!!!

I have a 2006 330i.
VIN: WBAVB33526KS38970

[Aj6543]

Actually, I'm starting to think its just something to do with the brakes. When I'm parked or driving really slow and I hit the brakes, the brakes jerk the car forward. Its like the brakes are extra sensitive. Any ideas?

[e90yyc]

If your brakes are moving the car forward, move your foot one pedal to the left

[e90yyc]

Originally Posted by Aj6543

I found the solution. I need to replace the solenoids.

https://www.bimmerfest.com/forums/sh...d.php?t=733273

Can someone help me find where I can purchase the solenoids from or which parts I need exactly.

Thank you!!!

I have a 2006 330i.
VIN: WBAVB33526KS38970

Try here

[lowrydr310]

Is it very difficult to park in a parking spot or maneuver a parking lot where you brake a lot? Are the brakes grabbing too hard when you apply the brake or do they seem to hold on too long when you release the pedal?

If it's the latter, I have a solution and it can be done via coding. In my case I almost hit a few walls in parking garages trying to slowly creep forward into parking spaces because the brake wouldn't release when I released the pedal, but then when it did release it lurched forward. I disabled the hill braking assist and it solved the problem for me - even though I wasn't on hills, the brakes wouldn't release until the pedal switch was deactivated (releasing the brake pedal past the switch point)

[N52bigblock]

Originally Posted by e90yyc

If your brakes are moving the car forward, move your foot one pedal to the left

[N52bigblock]

Originally Posted by lowrydr310

Is it very difficult to park in a parking spot or maneuver a parking lot where you brake a lot? Are the brakes grabbing too hard when you apply the brake or do they seem to hold on too long when you release the pedal?

If it's the latter, I have a solution and it can be done via coding. In my case I almost hit a few walls in parking garages trying to slowly creep forward into parking spaces because the brake wouldn't release when I released the pedal, but then when it did release it lurched forward. I disabled the hill braking assist and it solved the problem for me - even though I wasn't on hills, the brakes wouldn't release until the pedal switch was deactivated (releasing the brake pedal past the switch point)

Where did you disable this? DSC? I find it very annoying as well!!

[Aj6543]

Lowrydr310- It feels like the breakes are grabbing too hard.

Originally Posted by lowrydr310

Is it very difficult to park in a parking spot or maneuver a parking lot where you brake a lot? Are the brakes grabbing too hard when you apply the brake or do they seem to hold on too long when you release the pedal?

If it's the latter, I have a solution and it can be done via coding. In my case I almost hit a few walls in parking garages trying to slowly creep forward into parking spaces because the brake wouldn't release when I released the pedal, but then when it did release it lurched forward. I disabled the hill braking assist and it solved the problem for me - even though I wasn't on hills, the brakes wouldn't release until the pedal switch was deactivated (releasing the brake pedal past the switch point)

[Aj6543]

I think this is the solution! Has someone done the transmission reset?

https://www.e90post.com/forums/showthread.php?t=274142

[hassmaschine]

Originally Posted by lowrydr310

Is it very difficult to park in a parking spot or maneuver a parking lot where you brake a lot? Are the brakes grabbing too hard when you apply the brake or do they seem to hold on too long when you release the pedal?

If it's the latter, I have a solution and it can be done via coding. In my case I almost hit a few walls in parking garages trying to slowly creep forward into parking spaces because the brake wouldn't release when I released the pedal, but then when it did release it lurched forward. I disabled the hill braking assist and it solved the problem for me - even though I wasn't on hills, the brakes wouldn't release until the pedal switch was deactivated (releasing the brake pedal past the switch point)

you know that only activates if the clutch and brake are pressed at the same time (and for a certain number of seconds), and you are on a hill?

if I'm parking I just put it in neutral. I've never had the hill assist turn on when it wasn't supposed to...

[330istocknot]

Does it jerk forward when you let go of the brakes? I had this issue, replaced the read brakes and stopped the issue.

However i had other kind of jerking on another 330i, where you come to a stop, and when the car slowing down at 3MPH the car will jerk forward, this i never found a solution to it. If it feels like it might be the brakes, when youre on a full stop and let go of the brakes then it jerks, then replace the rear brakes. Good luck!

[N52bigblock]

Originally Posted by hassmaschine

you know that only activates if the clutch and brake are pressed at the same time (and for a certain number of seconds), and you are on a hill?

if I'm parking I just put it in neutral. I've never had the hill assist turn on when it wasn't supposed to...

I think he might be referring to auto trans models. Mine does excactly the same. If I'm coming up my driveway which has a slight incline, the brakes
hold, then when i give it a little bit of gas, it lurches forward, even though I'm just touching the gas pedal. It's quite annoying. I'm going to have a crack at disabling it.

[hassmaschine]

I didn't know AT's even had hill assist - I agree that sounds dumb and pointless.

Also, if your'e coming to a stop in an AT and it lurches, I'll bet that's the trans shifting down.

[N52bigblock]

Had a play and managed to deactivate my hill hold. It holds the brakes for 3 seconds after you release the brake pedal.
Changed it in DSC. It was called AFH_DOA. Changed from AKTIV to NICHT_AKTIV with NCS expert. I'll see how it goes without it.

[N52bigblock]

Originally Posted by hassmaschine

I didn't know AT's even had hill assist - I agree that sounds dumb and pointless.

Also, if your'e coming to a stop in an AT and it lurches, I'll bet that's the trans shifting down.

Yeah you're right, it would be quite useful with MT for doing hill starts maybe but it's dumb in an auto.
Yes he could also be describing the harsh 2-1 downshift problem.

[N52bigblock]

Originally Posted by Aj6543

Actually, I'm starting to think its just something to do with the brakes. When I'm parked or driving really slow and I hit the brakes, the brakes jerk the car forward. Its like the brakes are extra sensitive. Any ideas?

You could try putting it into manual shift mode, then come to a complete stop, keep your brakes on and maybe also apply your park brake, then shift from 2nd into 1st manually. If you get a thud or it lurches forward when you manually change from 2-1, that would confirm it is the trans solenoid issue and not the brakes? Just an idea

[smass]

Originally Posted by neilj35

You could try putting it into manual shift mode, then come to a complete stop, keep your brakes on and maybe also apply your park brake, then shift from 2nd into 1st manually. If you get a thud or it lurches forward when you manually change from 2-1, that would confirm it is the trans solenoid issue and not the brakes? Just an idea

This is the correct thing to do. Just do it after you have driven 30 minutes. Mine would only bump when hot.

[lowrydr310]

Originally Posted by hassmaschine

I didn't know AT's even had hill assist - I agree that sounds dumb and pointless.

This is correct. AT has it, and not only is it dumb and pointless, it makes parking virtually impossible without lurching and nearly hitting curbs/poles/walls. It sort of does what it's supposed to do, but it's very poorly executed.

I don't know if it's all models, but on my 2006 it was really bad. Even when I was on level ground (no hills, therefore it shouldn't even be activated) it was still holding the brakes until the brake switch released. In any normal car you could release the brake pedal a bit before the switch for the brake lights is released and roll forward a bit, but on my car I would slowly release the pedal to creep into a parking spot and the car wouldn't move, but then once I let the pedal out more and cleared the switch, the brakes would quickly release and the car would lurch forward.

Originally Posted by neilj35

Had a play and managed to deactivate my hill hold. It holds the brakes for 3 seconds after you release the brake pedal.
Changed it in DSC. It was called AFH_DOA. Changed from AKTIV to NICHT_AKTIV with NCS expert. I'll see how it goes without it.

That's the setting! While searching to a solution to this a few months ago, nearly everyone was saying it's the transmission specifically the neutral idle control causing it, but that's not correct. I was able to hold the car and manually shift back and forth between neutral and drive without any lurching or jerking. Once I disabled hill hold, the brakes behave like a normal car and it's easy to maneuver parking lots and garages now. It was immediately noticeable.


Also, I have two other newer Non-BMW cars with automatic transmission and they both have hill start assist, however they are only activated when I'm stopped on a real hill. It's still pointless because for the fraction of a second it takes to move my right foot from the brake pedal to the accelerator, there's enough torque at the wheels to keep from rolling backwards.

Even on manual transmission cars it's a nice feature but not necessary. I had an old MT Mitsubishi Eclipse GS-T with no hill start assist, and despite living in a city with a lot of hills, there were 150K miles on the original clutch and it was still fine.

[hassmaschine]

I don't mind it on my 6mt, but I can't for the life of me figure out what the point is with an AT. Normally you can just sit on a hill at idle and not roll back at all, or even roll forward a bit.

[bluewater328]

Originally Posted by hassmaschine

I don't mind it on my 6mt, but I can't for the life of me figure out what the point is with an AT. Normally you can just sit on a hill at idle and not roll back at all, or even roll forward a bit.

Well, the oddity of it is it also holds you back going downhill. I'm surprised my brakes lasted as long as they did given that the hill assist is basically gripping the disc pretty much all the time.

[Nando_e90]

Originally Posted by Aj6543

I think this is the solution! Has someone done the transmission reset?

https://www.e90post.com/forums/showthread.php?t=274142

Had same problem on my 2006 330i e90. When I was comming to a complete stop and the car shifted from 2nd to 1st, a kick happened all the time. So I changed solenoids and all mechatronic sleeves. Then, reset transmission software. It's been 7 months with tranny running like new.

Bought all parts at pelicanparts.com. But you could try resetting transmission first, maybe that is enough. In my case, there was also transmission (red gear light) error from time to time, so definetely was neccesary to replace sleeves at least, but i decided to replace solenoids too in order to avoid removing the mechatronic unit twice.