ABS and deep water
Submitted: Monday, Sep 25, 2006 at 15:41
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blacky
Hi guys
I have done a search thru the archives re ABS and
water crossings, but cannot find much. Does any one have any experience or problems with ABS in deep
water situations. The vehicle is a 2005 GU, just wondering where the sensors are and how sensitive they are to
water.
Also how difficult is it to put in a switch to turn the ABS on and off as some of the threads mentioned
Thanks
Reply By: Member - Graeme (NSW) - Monday, Sep 25, 2006 at 16:46
Monday, Sep 25, 2006 at 16:46
I have a 2001 GUI with ABS and I just pull the fuse in the panel under the driver's right knee. A switch in series with the power output would do the same thing. I expect, like a lot of little mods, will be technically illegal.
Graeme
AnswerID:
196435
Follow Up By: Member - Roachie (SA) - Monday, Sep 25, 2006 at 17:09
Monday, Sep 25, 2006 at 17:09
I pulled the fuse and replaced it with a gizmo I made that has 2 wires an in-line fuse and a switch on the dash.....too easy.
As far as
water is concerned, I've never had any dramas with it affecting the ABS at all. Don't get much
water action here in SA, but on a couple of
Cape York trips, the river crossings have not done any damage.
FollowupID:
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Reply By: Member - Oldplodder (QLD) - Monday, Sep 25, 2006 at 16:48
Monday, Sep 25, 2006 at 16:48
Friend next door doesn't have a 4wd but a falcon.
Went through
water knee deep and got stopped (another story here).
Water got into the engine computer under the dash.
After 3 months getting the car running OK (under insurance and the lot replaced in the end), still had issues with ABS working some time and not others, and ABS warning light displaying on the dash.
Ended up replacing the whole ABS system , sensors in each wheel and control module, under insurance luckly.
My car still has manual ABS, I modulate the brake pressure by foot as I was taught when I started rallying 35 years ago. :o)
So it would be interesting if the nissan went through
water deeper than recommended in the manual, and problems occured.
Makes me also think about the airbag sensors.
AnswerID:
196436
Follow Up By: Member - Mike DID - Tuesday, Sep 26, 2006 at 10:32
Tuesday, Sep 26, 2006 at 10:32
But can you apply less brake pressure to one wheel e.g. when one is on dirt and others on bitumen or when braking hard while going around a tight corner, or when you have dangerous understeer or oversteer ?
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Follow Up By: Member - Blue (VIC) - Tuesday, Sep 26, 2006 at 14:12
Tuesday, Sep 26, 2006 at 14:12
Handbrake Mike, skid steering is the most accurate way of cornering on gravel...lol
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Follow Up By: Member - Oldplodder (QLD) - Wednesday, Sep 27, 2006 at 20:56
Wednesday, Sep 27, 2006 at 20:56
Good one Blue.
Mike, that is something that does worry me.
ABS would only help with the gravel/bitumen problem. Traction control with the steering, and not all cars have both. And not all cars have four channel ABS either!
But my real concern is that people drive faster thinking they are safer with these devices, and so drive closer to the limit of the car. These devices would only save you too if you are not too far past it's limits.
Part of my driving experience is to learn these limits, and ABS and traction control can mask these limits. Drive to the conditions, your experience and your cars limits.
Yes, the ABS and traction control have saved lives, but it worries me that we are going to start loosing lives from people over estimating the technology, or as the cars age, as the technology fails unexpectedly.
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Reply By: Gerhardp1 - Monday, Sep 25, 2006 at 17:08
Monday, Sep 25, 2006 at 17:08
Water should not affect ABS. In my Jackaroo,
water does not affect it at all.
Most ABS sensors are exposed to
water spray when driving in normal rainy conditions on a highway, where they would be continuously saturated. Dunking them in a
creek crossing would have no more wetting effect than driving in rain.
In the Jackaroo, when driving in low range below a certain speed, tha ABS is automatically not acive, so I don't have to resort to pulling fuses which will invalidate your insurance claim if you have to make one.
I have never had a situation where I wished the ABS wasn't there, so the thought of de-activating it is the last modification I would ever consider.
AnswerID:
196439
Follow Up By: Member - Graeme (NSW) - Monday, Sep 25, 2006 at 17:22
Monday, Sep 25, 2006 at 17:22
I was on a slippery muddy track going downhill and I pushed on the brake pedal and little happening but the ABS modulating, I wished it was not there. Suffice to say the fuse was pulled for the rest of the time on the track. I replaced it on the bitumen.
Graeme
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Follow Up By: Gerhardp1 - Monday, Sep 25, 2006 at 17:31
Monday, Sep 25, 2006 at 17:31
I haven't had that problem, because the Jackaroo is an auto petrol and I would be in low range 1st, ABS not operational by design.
Nissan design engineers take note and learn....
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Reply By: Andrew-rodeo - Monday, Sep 25, 2006 at 18:50
Monday, Sep 25, 2006 at 18:50
ABS sensors won't be affected by
water, they are inductive type sensors. however the connections, if they aren't sealed properly will be affected and over time may become corroded.
AnswerID:
196460
Reply By: kimprado - Monday, Sep 25, 2006 at 20:47
Monday, Sep 25, 2006 at 20:47
Blacky,
I've said this before and, copped a lot of flack.
I'm prepared to do it again.
ABS has no place in the bush. It's good on the black top, but can be a serious problem for people offroad.
Car makers need to address this problem by providing an on/off switch.
In a perfect World all 4WD drivers (new to game), should go through a drivers course.
However, nothing will prepare you for the first, second, third....response from ABS on gravel roads or bush tracks. This is a particularly hard thing to teach people. At the end of the day, you become very wary of ABS.
Going through creeks should be your last concern with this technology.
Regards
Kim
AnswerID:
196493
Follow Up By: Redback - Tuesday, Sep 26, 2006 at 10:14
Tuesday, Sep 26, 2006 at 10:14
[QUOTE]
Car makers need to address this problem by providing an on/off switch. [QUOTE]
Why?
ABS is there for a reason to help when heavy breaking and breaking on gravel or slippery mud, so as not to loose steering control!!!!
I for one am a big fan of being in control when going down a very steep slippery
hill and being able to still steer the vehicle and not sliding down with the
wheels locked up out of control.
Hence why in 4WD training they teach you to feather the brake almost in the same fashion as how an ABS system works.
Baz.
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Follow Up By: Member - Mike DID - Tuesday, Sep 26, 2006 at 10:35
Tuesday, Sep 26, 2006 at 10:35
It's
well recognised that ABS INCREASES braking distance on gravel and snow - it's most probably in you Owner's Manual.
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Follow Up By: Redback - Tuesday, Sep 26, 2006 at 12:08
Tuesday, Sep 26, 2006 at 12:08
I didn't mention breaking distances, i think most car manufacturers assume that you drive at lower speeds on gravel and muddy roads, as you should.
ABS is to prevent skidding on paved or gravel because skidding means "no control"
Being able to break and steer around something is better than locking up and going straight ahead or off the side of the road.
Baz.
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Follow Up By: Member - Mike DID - Tuesday, Sep 26, 2006 at 12:32
Tuesday, Sep 26, 2006 at 12:32
You can avoid a collision by
a) reducing braking distance
ABS reduces braking distance on bitumen but increases it on gravel or snow - this is
well recognised.
b) avoiding loss of traction
Does ABS ALWAYS provide better directional control on gravel ?
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Follow Up By: Redback - Tuesday, Sep 26, 2006 at 12:42
Tuesday, Sep 26, 2006 at 12:42
Like everything, gotta know what your doing, (training) and yes in most conditions.
High speed is another story, nothing will save you at high speeds, aspecially when you factor a 4WD into the equation, 4WDs and speed don't mix.
Baz.
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Reply By: blacky - Monday, Sep 25, 2006 at 23:21
Monday, Sep 25, 2006 at 23:21
Thanks for all your comments
I like the idea of the "gizzmo", inline fuse and dash switch, any chance of a photo of the "gizzmo" (I am not that electrically minded, sorry)
re any insurance claims, I agree with the comments about ABS in the bush, and so it would (partially) do some manufactures, but why would you only choose low 1?? a lot of my low stuff is low 2 & 3, rarely 1.
Again Thanks
AnswerID:
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Follow Up By: Member - Mike DID - Tuesday, Sep 26, 2006 at 10:40
Tuesday, Sep 26, 2006 at 10:40
ABS system designers go to many extremes to make the system RELIABLE - duplicated power supplies etc.
If you are going to make any changes to your cars brake system, don't just design it to make it work - make sure it will be extremely reliable. e.g. will the plug which goes into the existing fuse holder vibrate and eventually reduce contact tension, leading to failure the next time you need the ABS to work hard.
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Follow Up By: Member - Roachie (SA) - Tuesday, Sep 26, 2006 at 11:14
Tuesday, Sep 26, 2006 at 11:14
Sorry, not much good at photo's and stuff. The "gizmo" is simply a piece of copper-clad printed circuit board, roughly the same size as the plastic section of a plug-in fuse. I soldered 2 prongs @ 90o to the PC board, so it effectively looks like a fuse. Drill 2 holes through it (one on each side) through each prong/PC board joint. Solder speaker-size wire through each hole. Cut the PC board's copper cladding between the 2 prongs (to isolate the 2 prongs from each other). Add an in-line fuse holder with same value fuse (7.5amp in the Patrol). Continue wires to a conveniently located dash mounted on/off switch. When in the "off" position, the dash light "ABS" is lit-up so I am reminded it is de-activated.
It makes stopping on loose gravel MUCH safer and sure-footed. I nearly killed us all on our 1st
Cape York trip when I hit a wash-away in the bottom of a DIP at a much faster speed than I should have because the bloody brakes were useless.
Roachie
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Reply By: Mike Harding - Tuesday, Sep 26, 2006 at 10:37
Tuesday, Sep 26, 2006 at 10:37
Buy a fuse of an identical type to that used in the ABS. Using a couple of temporary wires connect it directly across the battery terminals - fuse will blow, wise to wear safety glasses, just in case.
Keep blown fuse in glovebox and replace good fuse with it when off-road.
Insurance??? You didn't know the fuse had blown, did you?
Mike Harding
AnswerID:
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Follow Up By: Member - John R (NSW) - Tuesday, Sep 26, 2006 at 12:52
Tuesday, Sep 26, 2006 at 12:52
ABS warning light might tell you that, Mike?
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Follow Up By: Mike Harding - Tuesday, Sep 26, 2006 at 15:14
Tuesday, Sep 26, 2006 at 15:14
"Don't know anything about that mate, wasn't on when I was driving, must have blown at the time of the accident".
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Reply By: Member - Norm C (QLD) - Tuesday, Sep 26, 2006 at 12:30
Tuesday, Sep 26, 2006 at 12:30
The original question was about ABS and deep water. From my experience, deep water has no effect on my ABS.
The other subject mentioned (ABS and gravel roads) is a serious issue though. It can be very disconcerting hitting the anchors and getting little response when the ABS 'thinks' it is in a skid when it is not. Someone will get killed one day due to poor braking from a system meant to improve braking. The resultant law suits may lead to some action from car manufacturers.
On balance though, I'd rather have ABS than not. For the moment, my response is to drive slower and with increaed care on gravel roads.
AnswerID:
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Reply By: kimprado - Tuesday, Sep 26, 2006 at 20:22
Tuesday, Sep 26, 2006 at 20:22
Norm,
To some degree your right. I've come across quite a few incidents in the bush where ABS has given drivers a hell of a fright, or considerable panel damage.
To be fair though, the under lying cause is generally speed (in most cases).
However, the system can be quite dangerous even at low speeds under certain conditions. I'm not knocking technology, but the driver should have the final say with vehicle control.
To give you an example. In 2004 we road tested a V10 diesel VW along the Tanami where we experienced some of the worst mud conditions (in some areas) that I've been though in many years. The VW sailed along (using its technology) whilst I struggled to keep my car
on the road.
Two days later in different, but still muddy conditions, things changed. The VW had all sorts of problems which the driver couldn't address because he had no option.
I guess the philosophy I'm trying to impart, is that driver input is still the key element of vehicle safety. ABS or any other technology doesn't diminish that responsibility. It has a key part in vehicle design, but by no means the final driving decision. Therefore, it should be a drivers choice rather than being locked into design.
I'll await the moment whereby I'm ripped to shreds on this topic (I didn't have much of a life anyway).
Regards
Kim
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