[shaneguags]

Recently I started noticing that my brake pedal has been super stiff when cold starting my OG M2. Is this normal ? I daily drive the car and when warmed up, the brake pedal feels way less stiff. I just got my brake fluid change done recently and only have 18k milage on the car. If anyone has fixed this please let me know!

[M Fifty]

It is not normal. Did it only start doing this after the brake fluid change, or was it doing it before?

[shaneguags]

Originally Posted by M Fifty

It is not normal. Did it only start doing this after the brake fluid change, or was it doing it before?

I think it might've done it like a few times before but now it keeps consistently doing it. car feels fine, no codes. you think it's brake related ?

[M Fifty]

Well, yes?

[shaneguags]

Originally Posted by M Fifty

Well, yes?

the shop I called said it was normal, claiming it's a vacuum and stays stiff when cold

[M Fifty]

Try a different shop. That it's stiff says the brake servo isn't working properly (or you have some surprising mechanical binding problem in the linkage or hydraulic system when cold).

To be clear, the brake servo is designed to work just fine no matter how cold the weather is, and if something is binding in the linkage or hydraulic system that needs looking at.

Given the mileage, take it to BMW.

[shaneguags]

Originally Posted by M Fifty

Try a different shop. That it's stiff says the brake servo isn't working properly (or you have some surprising mechanical binding problem in the linkage or hydraulic system when cold).

To be clear, the brake servo is designed to work just fine no matter how cold the weather is, and if something is binding in the linkage or hydraulic system that needs looking at.

Given the mileage, take it to BMW.

so I scanned car and it says :

1BC004 zero gear sensor, adaptation: not learned (MSA disabled)

1D3810 clutch switch: Positions mutually
implausible

I'm assuming this is why the pedal is acting weird. do you know what the hell this is ? I never had this codes before the brake fluid flush. I hope that isn't what caused it.

[doughboy]

Originally Posted by shaneguags

so I scanned car and it says :

1BC004 zero gear sensor, adaptation: not learned (MSA disabled)

1D3810 clutch switch: Positions mutually
implausible

I'm assuming this is why the pedal is acting weird. do you know what the hell this is ? I never had this codes before the brake fluid flush. I hope that isn't what caused it.

I don't think they'll be related to brake pedal issues.

Maybe you have a vacuum leak which takes a few seconds to recharge after start up. The could have knocedk something when doing the brakefluid flush its all round that aread with the servo etc.

How long after start up is it before pedal goes to usual feel?

[shaneguags]

Originally Posted by doughboy

I don't think they'll be related to brake pedal issues.

Maybe you have a vacuum leak which takes a few seconds to recharge after start up. The could have knocedk something when doing the brakefluid flush its all round that aread with the servo etc.

How long after start up is it before pedal goes to usual feel?

it was weird because all I did was replace a ventilation breather tube, reset adaptations, and the car fixed itself. the code never came back and pedal was back to normal