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iaindb Profile
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Date Registered: 06-2009
Location: Palmerston, NT
TOTAL POSTS: 110
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how much can I brake before crossing water?


Hi all, it's been a while since I was here, but the dry season is almost upon us and I'm getting itchy!

I've read a couple of posts on hard braking and driving through water warping your discs. What I would like to know is how much braking is hard braking, and I have two "case" studies for you to comment on emoticon

Firstly, around the NT there's frequently all sorts of water over / under / around roads and sometimes there's little or no warning of how much or where it is. When I approach 10 - 20cm of water, after having done slight braking on not-too-hilly roads, no towing, should I brake hard, stop, and wait a minute before crossing, or should I brake softly and cruise through at a safe speed? (Just did this near Adelaide River recently, max 25cm of water, and no noticable problem).

Secondly, I'm going to tow a pop-top van from Darwin - El Questro this easter (woo!). I will have an electronic brake booster fitted, hopefully a proportional deceleration based unit. Now when I approach 10 - Xcm of water, while towing and possibly braking a bit more, what should I do?

Do I have to worry about the brakes + water if I'm not crossing any mountains?

Thanks heaps for your advice, this forum is invaluable!

Iain.

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Iain == X-1283 ==
T-30 ST-S, 2007, Twilight, Mags, Sun Roof

7/Apr/2011, 12:01 pm Link to this post Send Email PM   Send Private Message
 
cooch t31 Profile
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Date Registered: 06-2008
Location: Blue Mountains, NSW
TOTAL POSTS: 5966
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Re:


You shouldn't cross water if you have been using the brakes alot.
Hot discs mixed with cold water is a bad combination.
If you are unsure, let them cool down for 15 minutes or so.
A good test is to splash a LITTLE water on the disc through the wheel, if steam comes out, they're too hot.

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Tony X-891c

HERE is my D22 Navara
HERE is my old 2008 T31, ST Series1

11/Apr/2011, 6:23 pm Link to this post Send Private Message
 
iaindb Profile
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Date Registered: 06-2009
Location: Palmerston, NT
TOTAL POSTS: 110
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Re: how much can I brake before crossing water?


that's just what I want to know though - how much is "a lot"?

Is one brake before a puddle a lot? Is some windy roads a lot? Or is it only a lot if you're coming down a mountain and then through a puddle?

I don't want to stop every 10 minutes (yes it can be that often in this weather) and splash water on my wheels - I would never get through a 1000km trip...

thanks emoticon

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Iain == X-1283 ==
T-30 ST-S, 2007, Twilight, Mags, Sun Roof

12/Apr/2011, 10:06 am Link to this post Send Email PM   Send Private Message
 
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Hi Iain,

I don't think you can quantify "a lot" when it comes to braking mate. It depends how hard you ride the brakes and what type of terrain in facing you before you come to a river/creek crossing.

A good rule of thumb is to check the heat of the rotors everytime you come across a river crossing if you have been driving on land for a while, more so if you were going down hill where the brakes will be used harder and will obviously get much hotter.

In regards to puddles, just drive over each one of those with caution ALL the time, it's not a speed boat, it's a car LOL emoticon

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12/Apr/2011, 11:13 am Link to this post Send Private Message MSN Blog
 
iaindb Profile
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Date Registered: 06-2009
Location: Palmerston, NT
TOTAL POSTS: 110
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Re:


thanks Jalal. I take care for sure, but I'm just worried that with multiple puddles every few hundred metres I'll warp something. It's not feasible to stop every 100 metres or 10 minutes or whatever the last rain has left behind. Sometimes you come around a corner at 80km/h to find a new puddle where there wasn't one last time you passed, and have to brake firmly to get a safe speed to cross. I'm not rally driving - I really do drive cautiously - but stopping as you say for every puddle or crossing would take too long to drive 1000kms.

Hopefully the warp problem only applies to downhill driving before river crossings. The van has brakes so that will even the braking load.

You'll be hearing from me after May Day with our post-trip-wrapup emoticon

Now I'm about to go to the trailer shop to buy the attachments...

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Iain == X-1283 ==
T-30 ST-S, 2007, Twilight, Mags, Sun Roof

13/Apr/2011, 10:04 am Link to this post Send Email PM   Send Private Message
 
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re:


No worries mate,

We are talking about moderate off-road driving here still aren't we? emoticon

If so, I doubt you'll be doing 80kms an hour in such conditions unless Rally Driving indeed. Even on street puddles you would expect to slow down and not go through them at full speed emoticon

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13/Apr/2011, 10:18 am Link to this post Send Private Message MSN Blog
 
iaindb Profile
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Date Registered: 06-2009
Location: Palmerston, NT
TOTAL POSTS: 110
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Re: Re:


quote:

jalalski wrote:

No worries mate,

We are talking about moderate off-road driving here still aren't we? emoticon


yes, but more often than not in the wet season this happens on-road!

quote:

If so, I doubt you'll be doing 80kms an hour in such conditions unless Rally Driving indeed.


What I meant was doing 80km/h around an easy corner which reduces your visibility so that you can't see the water ahead. This means you have to brake "gently but firmly" say down to 20km/h in 50m.

My question was should I break harder to stop completely, wait 2 minutes, drive through or is it ok to do this one brake and drive through safely.

quote:

Even on street puddles you would expect to slow down and not go through them at full speed emoticon



of course - the pot holes up here can be half a metre deep so if you were crazy enough to go through at full speed you deserve what you get!

thanks emoticon

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Iain == X-1283 ==
T-30 ST-S, 2007, Twilight, Mags, Sun Roof

13/Apr/2011, 12:01 pm Link to this post Send Email PM   Send Private Message
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re: Re:


quote:

iaindb wrote:
My question was should I break harder to stop completely, wait 2 minutes, drive through or is it ok to do this one brake and drive through safely.



No waiting is required in this instance, just slow down normally and proceed over the puddle with care and caution. If you were doing 80kms/hour, it means you had a pretty clear road a head of you and your brakes won't be that hot anyway.

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13/Apr/2011, 12:54 pm Link to this post Send Private Message MSN Blog
 
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Date Registered: 07-2012
TOTAL POSTS: 23
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Re: how much can I brake before crossing water?


I live in north QLD and experience the kind of conditions your talking about. As a person requires to drive for a living I can tell you that droning a few hundred metres between puddles should cause you no problems. After 34 years living in the tropics I've never wrapped a rotor.
21/Jul/2012, 3:09 pm Link to this post Send Email PM   Send Private Message Blog
 
iaindb Profile
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Date Registered: 06-2009
Location: Palmerston, NT
TOTAL POSTS: 110
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Re: how much can I brake before crossing water?


Thanks T78! I was more concerned towing a van, but it turned out to be ok.

We drove from Darwin to El-Questro & back towing a Jayco Eagle. I had to wire the break controller and high power fridge feed myself. The mechanic, just before closing for the long weekend before we left, told me he couldn't do it after having it all day...!

The worst that happened after returning was new break pads, which were due soon anyway.

emoticon

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Iain == X-1283 ==
T-30 ST-S, 2007, Twilight, Mags, Sun Roof

7/Aug/2012, 9:52 pm Link to this post Send Email PM   Send Private Message
 


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