Cruise control deceleration - does it show the brake lights? - BMW 3-Series Forum (F30 / F32)

RobUK · 04-13-2013, 02:59 AM

One for you experts out there.... when the car decelerates rapidly on account of the cruise control, do the brake lights show?

I have noticed that if I have the cruise set to say 70mph and I then use the rocker thing on the steering wheel to drop the speed to 60mph quickly, the car actually feels like it's braking. I guess it's similar for those with active cruise, if a car pulls in front of you then you'll probably slow quite quickly. Is the car actually using the brakes (as opposed to engine braking) to slow the car down, in which case do the brake lights come on, given that you haven't actually plonked your foot on the pedal?

This is the first car I've had with cruise control that does this. Previous cars seemed to just gently lose speed (by coasting?) until the lower set speed is achieved. I know the F30 (as well as other models) has 'Brake Drying' so seems it can apply the brakes when it feels the need.

venkata · 04-13-2013, 03:25 AM

I hope so, only noticed the brake effect the other day. I thought it would cruise to the lower speed but found it braked quite hard. Don't think i'll do that next time as i could annoy the person behind me for unnecessary braking when there is no obstruction in front.

Doc943 · 04-13-2013, 03:33 AM

Yes they do. I set my CC to 30 mph down a very long, winding and steep hill near Whitby and could see the brake light reflection in the road signs and car behind. Quite a surreal experience not braking and putting my trust in some electronics!

edz_f31 · 04-13-2013, 12:04 PM

Yes it definitely does put the brake lights on when the CC is slowing the car down a lot. Also you can feel it is using the brakes if you then want to slow down even more as the pedal travels very little (!) before major stopping power of the brakes!!

SomeRandomer123 · 04-14-2013, 10:58 AM

Yep, we have Cruise Control With Brake Function.

04-13-2013, 02:59 AM	#1
RobUK Captain Drives: F30 328i Lux' 8SAT, Red Join Date: Jun 2012 Location: Sussex, UK Posts: 818 iTrader: (0) Garage List 2001 Yamaha FZS1000 [0.00] 2012 BMW 328i [5.00]	Cruise control deceleration - does it show the brake lights? One for you experts out there.... when the car decelerates rapidly on account of the cruise control, do the brake lights show? I have noticed that if I have the cruise set to say 70mph and I then use the rocker thing on the steering wheel to drop the speed to 60mph quickly, the car actually feels like it's braking. I guess it's similar for those with active cruise, if a car pulls in front of you then you'll probably slow quite quickly. Is the car actually using the brakes (as opposed to engine braking) to slow the car down, in which case do the brake lights come on, given that you haven't actually plonked your foot on the pedal? This is the first car I've had with cruise control that does this. Previous cars seemed to just gently lose speed (by coasting?) until the lower set speed is achieved. I know the F30 (as well as other models) has 'Brake Drying' so seems it can apply the brakes when it feels the need. __________________ 2012 F30 328i Lux', 8SAT, Melbourne Red
	Tweet

04-13-2013, 03:25 AM	#2
venkata Lieutenant Drives: F30 320D MSport EBII Join Date: Jan 2013 Location: Lancashire Posts: 454 iTrader: (0)	I hope so, only noticed the brake effect the other day. I thought it would cruise to the lower speed but found it braked quite hard. Don't think i'll do that next time as i could annoy the person behind me for unnecessary braking when there is no obstruction in front. __________________ Gone: E46 320D Sport \| Silver Grey \| Xenon \| Heated Leather \| Rain Sensors \| M Sports package II Driving: http://mybmw.co.uk/x1j0z7b7 \| F30 320D ///M-Sport \| EBII \| Black Leather \| Visibility Pack \| Adaptive Suspension \| Media Pro Pack \| BMW Apps \| Sports Auto \| Sun Protection Glass \| EU6 BluePerformance Diesel

04-13-2013, 12:04 PM	#4
edz_f31 Private First Class Drives: F31 320d MSport Join Date: Nov 2012 Location: Cumbria, England Posts: 141 iTrader: (0)	Yes it definitely does put the brake lights on when the CC is slowing the car down a lot. Also you can feel it is using the brakes if you then want to slow down even more as the pedal travels very little (!) before major stopping power of the brakes!! __________________ F31 320D M Sport Touring Mineral Grey / Coral Red

04-14-2013, 10:58 AM	#5
SomeRandomer123 Lieutenant Colonel Drives: F30 328i Luxury - Sport Auto Join Date: May 2011 Location: Lancashire, North West England, UK Posts: 1,939 iTrader: (0)	Yep, we have Cruise Control With Brake Function. __________________ Gone: 2006 BMW E60 520d SE 6MT Gone: 2009 BMW E90-LCI 330d SE 6MT - Awesome! 28th May 2009 - 28th May 2012 Current: 2012 F30 328i Luxury 8AT - Loving it! My 328i thread!http://www.f30post.com/forums/showthread.php?t=712673

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

04-13-2013, 03:33 AM	#3
Doc943 Private Drives: F30 320d SE Join Date: Oct 2012 Location: East Yorkshire Posts: 57 iTrader: (0)	Yes they do. I set my CC to 30 mph down a very long, winding and steep hill near Whitby and could see the brake light reflection in the road signs and car behind. Quite a surreal experience not braking and putting my trust in some electronics!