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#4676908 - 02/24/18 07:50 PM Braking during a hard rain
Kira Offline


Registered: 08/19/10
Posts: 5263
Loc: Champlain/Hudson Valley
No big deal here, just a first time observation.

'Twas a rainy drive south on the Interstate yesterday. Lots of rain, spray, splashing, fog, condensation....everything wet.
I'd touch the brakes when necessary and feel nothing. Leaning on 'em a bit caused a minor, somehow exaggerated vibration and finally a predictably even braking effect.

The first time was near alarming. I could see a mechanically disinclined person panicing.
How "well lubed" the brake hardware STAYED at less-than-strong pressures was surprising.

The few times I tested it for real involved peddle pressure far in excess of "surprised stopping" and 10 car lengths were needed to BEGIN stopping the car.
Anybody ever experience that?

Just for giggles, I'm going to inspect my 15,000 mile old front and 46,000 mile old rear brakes.

ps Today (dry day) the brakes feel just fine. No hint of pulsing / vibration.

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#4676913 - 02/24/18 07:54 PM Re: Braking during a hard rain [Re: Kira]
Rand Offline


Registered: 08/20/03
Posts: 12651
Loc: NE,Ohio
probably just water soaked.
If you drive in heavy rain and dont touch the brakes for awhile.
takes a second or 2 to dry up and work better.

Also what brake pads were installed?
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#4676922 - 02/24/18 07:59 PM Re: Braking during a hard rain [Re: Rand]
Kira Offline


Registered: 08/19/10
Posts: 5263
Loc: Champlain/Hudson Valley
I have no idea what brand hardware was used.
Being the car was serviced at a Volvo dealership, I'd ASSUME they used Volvo parts.

The vehicle is a 2007 V70 NA...my pride and joy...my third V70.
Hunted so long I bought at a dealership.

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#4676952 - 02/24/18 08:39 PM Re: Braking during a hard rain [Re: Kira]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4860
Loc: Houston, Texas
Happens on my truck too. Totally normal.
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#4676953 - 02/24/18 08:39 PM Re: Braking during a hard rain [Re: Kira]
PimTac Online   content


Registered: 03/04/17
Posts: 4337
Loc: Soviet State of Washington
Very common. Drive through a deep puddle or standing water and touch your brakes to evaporate the water off by heat. If it’s the first rain in a long time then add road oil to the mix
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#4676954 - 02/24/18 08:40 PM Re: Braking during a hard rain [Re: Kira]
Wolf359 Offline


Registered: 04/27/12
Posts: 4767
Loc: MA
Next time I'm driving in the rain, I'll have to check. Mine has a brake drying feature, it applies the brakes slightly to keep the rotors dry when the wipers are in use. A quick search shows that Mercedes, BMW, Audi, VW, and Cadillac are some of the manufacturers that have it.

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#4676964 - 02/24/18 08:51 PM Re: Braking during a hard rain [Re: Wolf359]
Vern_in_IL Online   mad


Registered: 06/25/14
Posts: 1892
Loc: IL
Originally Posted By: Wolf359
Next time I'm driving in the rain, I'll have to check. Mine has a brake drying feature, it applies the brakes slightly to keep the rotors dry when the wipers are in use. A quick search shows that Mercedes, BMW, Audi, VW, and Cadillac are some of the manufacturers that have it.


Wow, did not know this, thanks!
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#4676977 - 02/24/18 09:00 PM Re: Braking during a hard rain [Re: Vern_in_IL]
Kira Offline


Registered: 08/19/10
Posts: 5263
Loc: Champlain/Hudson Valley
I think I heard of such "brake drying" feature before.

I suppose the feature has its place. I hope it doesn't eat brakes

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#4676987 - 02/24/18 09:10 PM Re: Braking during a hard rain [Re: Wolf359]
PimTac Online   content


Registered: 03/04/17
Posts: 4337
Loc: Soviet State of Washington
Originally Posted By: Wolf359
Next time I'm driving in the rain, I'll have to check. Mine has a brake drying feature, it applies the brakes slightly to keep the rotors dry when the wipers are in use. A quick search shows that Mercedes, BMW, Audi, VW, and Cadillac are some of the manufacturers that have it.



I like the old saying, “Trust but Verify.”
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Valvoline Advanced Synthetic 0w20
Mobil 1 M108A EP filter


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#4676994 - 02/24/18 09:16 PM Re: Braking during a hard rain [Re: Kira]
Wolf359 Offline


Registered: 04/27/12
Posts: 4767
Loc: MA
Originally Posted By: Kira
I think I heard of such "brake drying" feature before.

I suppose the feature has its place. I hope it doesn't eat brakes


It's mentioned in this brochure.

http://www.auto-brochures.com/makes/Mercedes_Benz/E-Class/Mercedes%20Benz_US%20E-Class_2008.pdf

Doesn't seem to eat them. I did the brakes about a year ago after having it for 2 years. It still had over half the pad left. It had new pads when I got it. I just got sick and tired of the brake dust and I put in Akebono pads instead. No dust now.

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#4677001 - 02/24/18 09:20 PM Re: Braking during a hard rain [Re: Kira]
KrisZ Offline


Registered: 12/23/06
Posts: 7475
Loc: Toronto, Canada
I have experienced this as well in heavy rain, totally normal. Yes it can feel scary at first because the delay makes it feel like you have no brakes.
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#4677033 - 02/24/18 09:39 PM Re: Braking during a hard rain [Re: Wolf359]
Linctex Offline


Registered: 12/31/16
Posts: 6178
Loc: Waco, TX
Originally Posted By: Wolf359

I just got sick and tired of the brake dust ... No dust now.


You now have ceramic brake pads.
Yes, dust is gone - - but I HATE HATE HATE how "low friction" they are.

Ceramic brake pads last forever, but can be really hard on rotors.

Carbon Metallic brake pads have been my favorites.
I'm not a fan of the new ceramic brake pads at all.
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#4677036 - 02/24/18 09:40 PM Re: Braking during a hard rain [Re: Rand]
bbhero Offline


Registered: 03/20/15
Posts: 4630
Loc: Virginia
Great answer by Rand.

I drove through rather deep water in Mathews county. Above the top of tire... Was going 50 mph and heading towards a rather sharp curve. Thank goodness I stated to brake early.... Took awhile for the brakes to get to working. I managed to get slowed down in time. Barely. Learned a good lesson that afternoon.
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#4677042 - 02/24/18 09:46 PM Re: Braking during a hard rain [Re: Wolf359]
bbhero Offline


Registered: 03/20/15
Posts: 4630
Loc: Virginia
Wolf359 is big, big money. Only cool cats with cash can have a feature that on their vehicles LOL


Just messing with you Wolf. Hope you've had a good day today.
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"Treat your family like your friends and treat your friends like your family."

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#4677071 - 02/24/18 10:11 PM Re: Braking during a hard rain [Re: Kira]
MCompact Offline


Registered: 07/21/02
Posts: 4118
Loc: KY
Originally Posted By: Kira
I think I heard of such "brake drying" feature before.

I suppose the feature has its place. I hope it doesn't eat brakes


My 2 Series has brake drying; I'm currently at 39k miles- including three HPDE days and one night at the local drag strip. Still on the original pads and based on the Condition Based Service calculation I probably won't need new pads for at least another 10k miles.
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