So I have been digging around on brake drying. It would seem that from 2006 all 6 cylinder models with auto wipers had this as standard. This came from a bimmerfest post :
--------------------
The six-cylinder models of the BMW 3 Series Sedan offer five extended DSC functions:
1. Brake stand-by for reduced stopping distances in an emergency.
2. Brake drying for improved brake response in wet conditions.
3. The hill-start assistant for worry-free hill starts without rolling backwards.
4. Fading compensation for consistent braking even when the brakes have heated up.
5. Soft stop for smoother stops and reduced brake drive.
I can't say anything with authority, but this info does not ring true to me. Everything in BMW's literature about the Brake Drying feature states that whenever the brakes sense water (via the action of the windshield wipers) the feature is activated.
From the 2006 E90 Product Information Guide:
Brake Drying. Acting on input from the rain
sensor (an element of the rain-sensing
windshield wipers), the pads are periodically
brought up to the rotors ***8211; just enough to
eliminate any film of water between pads
and rotors, but not enough to cause any
brake application.
From the BMWUSA website:
Our enhanced braking system does more than just brake. In rain, the automatic windshield wipers trigger the brake-drying feature, which presses the brake pads to the rotors to dry them.
Not the Z4, but isn't it based on the 3 series ? I haven't found a product information manual for the e85/86, but I may just go out to the car and RTFM, as I am sure that's where I read it...
Interestingly, whilst on my reading travels on the BMW site it also seemed to confirm that in reduced grip situations (ice, snow, wet roads) DTC should be switched on.
--------------------
The six-cylinder models of the BMW 3 Series Sedan offer five extended DSC functions:
1. Brake stand-by for reduced stopping distances in an emergency.
2. Brake drying for improved brake response in wet conditions.
3. The hill-start assistant for worry-free hill starts without rolling backwards.
4. Fading compensation for consistent braking even when the brakes have heated up.
5. Soft stop for smoother stops and reduced brake drive.
I can't say anything with authority, but this info does not ring true to me. Everything in BMW's literature about the Brake Drying feature states that whenever the brakes sense water (via the action of the windshield wipers) the feature is activated.
From the 2006 E90 Product Information Guide:
Brake Drying. Acting on input from the rain
sensor (an element of the rain-sensing
windshield wipers), the pads are periodically
brought up to the rotors ***8211; just enough to
eliminate any film of water between pads
and rotors, but not enough to cause any
brake application.
From the BMWUSA website:
Our enhanced braking system does more than just brake. In rain, the automatic windshield wipers trigger the brake-drying feature, which presses the brake pads to the rotors to dry them.
Not the Z4, but isn't it based on the 3 series ? I haven't found a product information manual for the e85/86, but I may just go out to the car and RTFM, as I am sure that's where I read it...
Interestingly, whilst on my reading travels on the BMW site it also seemed to confirm that in reduced grip situations (ice, snow, wet roads) DTC should be switched on.