Brake pedal pulsing with wipers?

mtnyeti12 · 12-02-2005, 07:08 PM

Anyone notice when their windshield wipers are on and the vehicle is at a complete stop the brake pedal pulse's with the movement of the wipers. Very strange and I've read on some other forums that this is happening on other 3 series. Just want to know if this is normal....

scottz5 · 12-02-2005, 08:13 PM

Yea it does that!

Mikey3 · 12-02-2005, 08:16 PM

hahahha, ive never noticed that, does it get faster if the wipers go faster?

mtnyeti12 · 12-02-2005, 08:18 PM

Quote:

Originally Posted by Mikey

hahahha, ive never noticed that, does it get faster if the wipers go faster?

Haha!! Actually it does!! Kinda feels weird - I can't think of what the wipers would do to cause it.

mtnyeti12 · 12-02-2005, 09:09 PM

By the way ... you can only feel it when the vehicle is at a complete stop. At 5 mph you can't feel it.

tctic · 12-02-2005, 09:13 PM

Hmm... I never felt this.. I will pay extra attention next time. I think it's the Brake Drying Feature in operation. The E90 will use data from the rain sensor and lightly wipes the brake dry for better braking performance.

JamieA · 12-02-2005, 11:56 PM

I have noticed this the other day during a downpour - gave me a chance to see what the wipers were like... It was very subtle though.

This has been discussed in another post, and I think it was E90Fleet who pointed out that this is the brake disc wipe function, it operates in conjunction with the wipers to slightly touch the surface of the brake discs with the brake pads periodically in order to keep them dry for optimal stopping in wet conditions.

ON325i · 12-03-2005, 12:15 AM

never notice that, will keep an eye on it next time it rains

BMW0 · 12-03-2005, 02:21 AM

That surely is a Quirk to list

SiR · 12-04-2005, 01:57 PM

Its because the wiper motor is attached to the firewall. The brake pedal is attached to the firewall as well.

tctic · 12-04-2005, 03:12 PM

I noticed that today now.

Papa13 · 12-04-2005, 04:00 PM

its because the e90 has a advanced brake drying system. When the wipers are on the brakes have a little tension on them so it dryes the brakes without making contact. Thats what you feel... Scared me the first time also. But thats what it is. Just another amazing invention by BMW haha

tctic · 12-04-2005, 04:04 PM

The pulsing is so weak that I didn't even notice before I read this thread.

mtnyeti12 · 12-04-2005, 04:07 PM

The brake drying makes sense... but I now feel it everytime I'm stopped with the wipers on. No worries though... I'm still smiling everytime I slide into the seat!!! By the way finally reached 1500 miles and put it to the red line today... WHOA!! Nice acceleration for 215hp and AWD!

SiR · 12-04-2005, 05:57 PM

Quote:

Originally Posted by Papa13

its because the e90 has a advanced brake drying system. When the wipers are on the brakes have a little tension on them so it dryes the brakes without making contact.

How 'bout, no. I just told you the answer. Stop giving people wrong information.

Wolf359 · 12-04-2005, 06:04 PM

This is not related to the brake-drying function. We've been talking about a stationary car, from the beginning of this post.

That said, I don't think there is anything wrong with the car. It's just a strange feeling.

db17k · 12-04-2005, 06:33 PM

Quote:

Originally Posted by Papa13

its because the e90 has a advanced brake drying system. When the wipers are on the brakes have a little tension on them so it dryes the brakes without making contact. Thats what you feel... Scared me the first time also. But thats what it is. Just another amazing invention by BMW haha

that's not it, i'll bet money on it. My 02' & 03' civic did this too.

mtnyeti12 · 12-04-2005, 06:47 PM

Hahaha... we almost need a vote!! But I think I'm going to go with the firewall/wiper motor theory. It makes sense as the wipers go to the stow position then when they reactivate is when the pulse occurs (in time with the wiper motor). The brake drying feature shouldn't be operating at a stop. But who knows... I'm going to shoot an email to BMWNA and try to get some resolution on this mystery.

LEDZEP · 12-04-2005, 07:43 PM

I haven't noticed it, but it would be (as others have mentioned) the brake drying system - which works in conjunction with the rain sensor.

SiR · 12-04-2005, 09:56 PM

Quote:

Originally Posted by LEDZEP

I haven't noticed it, but it would be (as others have mentioned) the brake drying system - which works in conjunction with the rain sensor.

HAHAHA, I give up, the reader will take the facts straight. I know there is other mechanics then just me reading this.

db17k · 12-04-2005, 10:11 PM

BLAHBLAHBLAH BLAH STUPID STUPID STUPID STUPID YAHYAHYAHYAH

provide evidence that it's the brake drying feature then I'll shut up, but untill then! BLAHBLAHBLAH BLAH STUPID STUPID STUPID STUPID YAHYAHYAHYAH BLAHBLAHBLAH BLAH STUPID STUPID STUPID STUPID YAHYAHYAHYAH BLAHBLAHBLAH BLAH STUPID STUPID STUPID STUPID YAHYAHYAHYAH BLAHBLAHBLAH BLAH STUPID STUPID STUPID STUPID YAHYAHYAHYAH STUPID HOW THE HELL WOULD THAT EVEN BE CLOSE WHEN THE CAR IS STOPPED! BRAKE DRYING FEATURE IS DESIGNED NOT TO BE FELT WIPER MOTOR IS CERTAINLY THE CASE BLAH BLAH BLAH

tctic · 12-04-2005, 10:31 PM

How about this? Try going out to your car, do not start your car but only your windshield wipers. See if the brake pedal pulses. The Brake Drying feature shouldn't work if not in the 'on' position.

12-02-2005, 07:08 PM	#1
mtnyeti12 Private 12 Rep 79 Posts Drives: 2006 325xi Join Date: Sep 2005 Location: NC iTrader: (0)	Brake pedal pulsing with wipers? Anyone notice when their windshield wipers are on and the vehicle is at a complete stop the brake pedal pulse's with the movement of the wipers. Very strange and I've read on some other forums that this is happening on other 3 series. Just want to know if this is normal.... __________________ TiAG\|Black Dakota\|Burl\|Xenon\|Steptronic\|Premium\|I-Drive\|CA\|CW\|
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12-02-2005, 08:13 PM	#2
scottz5 Lieutenant Colonel 94 Rep 1,730 Posts Drives: 13 F10 535xi & 11.75 E93 M3 Join Date: May 2005 Location: Earth iTrader: (0)	Yea it does that! __________________ 13 F10 535xi JB/B working on it 11.75 E93 M3 MR/Black Stock (wifey) 11 F10 535i AW/CB Mods Gone
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12-02-2005, 08:16 PM	#3
Mikey3 Private First Class 10 Rep 133 Posts Drives: e90..... soon.... Join Date: Sep 2005 Location: Australia - Perth iTrader: (0)	hahahha, ive never noticed that, does it get faster if the wipers go faster? __________________ Tell me what you eat And I will tell you what you are.
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12-02-2005, 09:09 PM	#5
mtnyeti12 Private 12 Rep 79 Posts Drives: 2006 325xi Join Date: Sep 2005 Location: NC iTrader: (0)	By the way ... you can only feel it when the vehicle is at a complete stop. At 5 mph you can't feel it. __________________ TiAG\|Black Dakota\|Burl\|Xenon\|Steptronic\|Premium\|I-Drive\|CA\|CW\|
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12-02-2005, 09:13 PM	#6
tctic Major 38 Rep 1,238 Posts Drives: BMW E90 Join Date: Oct 2005 Location: Canada iTrader: (0)	Hmm... I never felt this.. I will pay extra attention next time. I think it's the Brake Drying Feature in operation. The E90 will use data from the rain sensor and lightly wipes the brake dry for better braking performance.
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12-02-2005, 11:56 PM	#7
JamieA Colonel 93 Rep 2,168 Posts Drives: G01 X3 M40i Join Date: Sep 2005 Location: Adelaide, Australia iTrader: (0)	I have noticed this the other day during a downpour - gave me a chance to see what the wipers were like... It was very subtle though. This has been discussed in another post, and I think it was E90Fleet who pointed out that this is the brake disc wipe function, it operates in conjunction with the wipers to slightly touch the surface of the brake discs with the brake pads periodically in order to keep them dry for optimal stopping in wet conditions. __________________ '05 E90 325i \| '06 E90 325i \| '08 E90 325i LCI \| '13 F30 328i M-Sport \| '14 F10 535d M-Sport Current: '19 G01 X3 M40i
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12-03-2005, 12:15 AM	#8
ON325i Captain 18 Rep 740 Posts Drives: e90 325i Join Date: Aug 2005 Location: Toronto, Canada iTrader: (0) Garage List 2006 e90 325i [0.00]	never notice that, will keep an eye on it next time it rains __________________ e90 325i Jet Black / Sports Pkg / Auto
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12-03-2005, 02:21 AM	#9
BMW0 Colonel 241 Rep 2,059 Posts Drives: AW E90 330i Join Date: Nov 2005 Location: Spokane, WA iTrader: (0) Garage List 2006 330i [0.00]	That surely is a Quirk to list __________________ 330i 6MT l 255 HP @ 5900 rpm 214 lb-ft Torque @ 3500 rpm l Alpine White l Beige l Aluminum l ZSP l 494 l PDC "Freude am Fahren" = "Joy to Drive"
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12-04-2005, 01:57 PM	#10
SiR Private First Class 1 Rep 145 Posts Drives: E34 525i, E92 335i Join Date: Apr 2005 Location: Fort Lauderdale, FL iTrader: (1)	Its because the wiper motor is attached to the firewall. The brake pedal is attached to the firewall as well.
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12-04-2005, 03:12 PM	#11
tctic Major 38 Rep 1,238 Posts Drives: BMW E90 Join Date: Oct 2005 Location: Canada iTrader: (0)	I noticed that today now.
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12-04-2005, 04:00 PM	#12
Papa13 Go Gators! 90 Rep 1,621 Posts Drives: e82 / e90 / e53 / e46 Join Date: Nov 2005 Location: Tampa / SoCal iTrader: (5) Garage List 2009 135i [0.00]	its because the e90 has a advanced brake drying system. When the wipers are on the brakes have a little tension on them so it dryes the brakes without making contact. Thats what you feel... Scared me the first time also. But thats what it is. Just another amazing invention by BMW haha __________________ e90 M-Tech 330i JB/Terra / e82 n54 135i AW/CR 420rwhp 444rwtq - RIP e53 X5 4.8is M///BLUE/M///SUEDE - 357whp 369wtq - The Snow Beast! n54 135i JB/CR JB4 FBO - Tc Kline D/A Coils - 11.5 @ 122mph 1/4 mile 18' Blue/Black SEL Premium R-Line 4 Motion Tiguan - Mods on order
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12-04-2005, 04:04 PM	#13
tctic Major 38 Rep 1,238 Posts Drives: BMW E90 Join Date: Oct 2005 Location: Canada iTrader: (0)	The pulsing is so weak that I didn't even notice before I read this thread.
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12-04-2005, 04:07 PM	#14
mtnyeti12 Private 12 Rep 79 Posts Drives: 2006 325xi Join Date: Sep 2005 Location: NC iTrader: (0)	The brake drying makes sense... but I now feel it everytime I'm stopped with the wipers on. No worries though... I'm still smiling everytime I slide into the seat!!! By the way finally reached 1500 miles and put it to the red line today... WHOA!! Nice acceleration for 215hp and AWD! __________________ TiAG\|Black Dakota\|Burl\|Xenon\|Steptronic\|Premium\|I-Drive\|CA\|CW\|
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12-04-2005, 06:04 PM	#16
Wolf359 Captain 12 Rep 942 Posts Drives: 2006 BMW 325i Join Date: Sep 2005 Location: Canada iTrader: (0)	This is not related to the brake-drying function. We've been talking about a stationary car, from the beginning of this post. That said, I don't think there is anything wrong with the car. It's just a strange feeling.
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12-04-2005, 06:47 PM	#18
mtnyeti12 Private 12 Rep 79 Posts Drives: 2006 325xi Join Date: Sep 2005 Location: NC iTrader: (0)	Hahaha... we almost need a vote!! But I think I'm going to go with the firewall/wiper motor theory. It makes sense as the wipers go to the stow position then when they reactivate is when the pulse occurs (in time with the wiper motor). The brake drying feature shouldn't be operating at a stop. But who knows... I'm going to shoot an email to BMWNA and try to get some resolution on this mystery. __________________ TiAG\|Black Dakota\|Burl\|Xenon\|Steptronic\|Premium\|I-Drive\|CA\|CW\|
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12-04-2005, 07:43 PM	#19
LEDZEP Lieutenant General 418 Rep 12,276 Posts Drives: 2009 E70 & 2011 F25 Join Date: Jun 2005 Location: Area 51 iTrader: (0) Garage List 2011 X3 35i M Sport [7.62] 2009 X5 M Sport [0.00] 2007 328xi E90 [0.00] 2006 325xiT E91 [0.00]	I haven't noticed it, but it would be (as others have mentioned) the brake drying system - which works in conjunction with the rain sensor. __________________ I think it is bad luck to be superstitious
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12-04-2005, 10:11 PM	#21
db17k Chicketeh china the chinese chicken, you have? 34 Rep 790 Posts Drives: 335ci hold out Join Date: Oct 2005 Location: San Francisco iTrader: (0) Garage List 2003 S2000 [0.00]	BLAHBLAHBLAH BLAH STUPID STUPID STUPID STUPID YAHYAHYAHYAH provide evidence that it's the brake drying feature then I'll shut up, but untill then! BLAHBLAHBLAH BLAH STUPID STUPID STUPID STUPID YAHYAHYAHYAH BLAHBLAHBLAH BLAH STUPID STUPID STUPID STUPID YAHYAHYAHYAH BLAHBLAHBLAH BLAH STUPID STUPID STUPID STUPID YAHYAHYAHYAH BLAHBLAHBLAH BLAH STUPID STUPID STUPID STUPID YAHYAHYAHYAH STUPID HOW THE HELL WOULD THAT EVEN BE CLOSE WHEN THE CAR IS STOPPED! BRAKE DRYING FEATURE IS DESIGNED NOT TO BE FELT WIPER MOTOR IS CERTAINLY THE CASE BLAH BLAH BLAH __________________ "In Soviet Russia car forks you!"
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12-04-2005, 10:31 PM	#22
tctic Major 38 Rep 1,238 Posts Drives: BMW E90 Join Date: Oct 2005 Location: Canada iTrader: (0)	How about this? Try going out to your car, do not start your car but only your windshield wipers. See if the brake pedal pulses. The Brake Drying feature shouldn't work if not in the 'on' position.
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