Brake Bias System on Utes....anyone familiar with it?

from memory it was use of WDH could twist the chassis?

Most of the twin cabs with broken chassis were fitted with air bags, were towing or carrying large loads and not using WDH.

The advice Was "not recommenced on Nissan bars." This came about when a couple of bars on Pathfinders (not utes) fell off because of the twisting from WDH. Nissan made no mention of WDH being used or not being used on other manufacturers bars.

There isn't a warning on the bar about WDH. Only the capacities for towing & another warning not to exceed the Nissan criteria for towing.

My mate also told me that he had cable tied his "Brake Bias" so it would seem a load was on the rear. He used a WDH. He did not have ABS,,which mine has. I am still trying to find out if it has EBD. Are you suggesting gbc that I cable tie the Brake Bias & use WDH...I'm a bit confused by your comparison. Thanks everyone for the replies.

Quote "A WDH will trick the bias valve into thinking the ute is empty, and will rob it of valuable stopping power - there's no way it can't do this."

How do you work that one out? To make the bias think the ute is empty you would have to lift the back up to at least the the level it would be without anything in the tray and the van not hitched.

In the real world there is a fair bit in the tray. This compresses the rear suspension somewhat. Then when you hitch the van and tension the WDH bars the rear suspension is a little further compressed. This will give a true indication to the braking system that there is a load on the back of the tug. I don't think you have thought the situation out properly.

On the matter of "the best way is to not use a WDH" that will reduce the braking available on the front axle. Good braking on the front axle is paramount. If you don't have WDH then a considerable amount of weight is removed from the axle. This will decrease the amount of braking available.

How do I work what out?
A WDH is now not used to move the centre of effort from ball weight forward along a chassis? Give me a break.
The key point here is not to 'guess' what's in the tray, or guess if the WDH has allowed the rear to compress a bit. It's to understand how a factory standard ute on factory standard springs with no WDH would sit with the same van on the back and load in the tray. Sagged down like a mangy dog is the most common answer, and in that position braking effort (BIAS) is moved from the front to the rear of the vehicle, and rightly so.
Good braking on the front is inportant, I agree, but when performing an emergency stop towing a big trailer and ONLY the fronts lock up or work because the bias valve won't allow the rears to grab, how do you think it's going to end? Believe me, I've found out the hard way how they work/don't work, as have plenty of others, hence why the actuator gets cable tied to the chassis when towing with modified suspension, airbags, WDH's or anything else that does not give a true indication of how much traction is available to the rear wheels.

NTVRX - I'm not going to tell you what to do, but I'll tell you that my last vehicle ('03 hilux SR5) had airbags on the rear (dual cab, towed all over the country, didn't snap - amazing) which also assist a vehicle to maintain a proper attitude when towing. I will also tell you that it had a 2" lift kit. When I installed the lift kit, I purchased (separately) a brake bias extension which moved the lower (axle) mounting point 2" higher so that braking wasn't compromised when the ute was empty. However, it soon became abundantly apparent that when carrying load, or towing load and using the airbags/HD springs to assist, the lack of rear bias made the vehicle dangerous. From then on, when towing any distance, it was common place to undo the brake bias arm and cable tie it up under the tray. The difference had to be felt to be believed.
In your case I believe this argument will be moot, as I am pretty confident that if you have ABS, you get EBD and BAS anyway in the D40's.

Yea I guess thats one way to check it! LOL.

Another way is that there is usually a sticker next to the rear diff filler plug indicating that the vehicle is fitted with an LSD.

Bushy,
I have seen those same stickers on Toyota diffs and we know what that means. This is an LSD equipped vehicle sucker. Ha.Ha.

I got caught the other day in my new Ranger which has a diff lock, hell you have to push the button. Well I accustomed to my old troopie with the detroit lockers. Damn. I left one really nasty one wheel divot up a bank.

RA.

Yep,already had that thought RA.....I thought but haven't looked at diff housing didn't know if there was another code somewhere. Nissan book is filled with......"Where fitted" alongside listed components!!! Useful as an ashtray on a motor bike!!!

Had a visit to Red Book & found my model listed & the list of standard equipment matches my vehicle to a T. There was no mention of LSD however EBD is listed as standard. Rob

Thanks everyone for taking the time to respond to my post. Robert.