Don't like the adverts?  Click here to remove them

Does Mr Toyoda really know best? (Or ABS + muddy roads + centre diff lock switch)



I've just been out on some very single track, muddy and steep roads and
had quite an interesting experience.

Going down about 1 in 4 I had to stop for a car coming the other way,
and I had both LHS wheels on the mixture of mud and leaves in the verge.
We came to a halt ... eventually ... with the ABS burbling away
underfoot. It wasn't a drama because I was going slowly.

However when the car had passed I thought "hmm", backed up, and tried it
again - with the same result.

"Hmm" squared! Backed up again, and tried again, but this time using
the dash switch to lock the centre diff and - more to the point -
disable the ABS. Stopping distance was now about 1/4 of what it was
with ABS engaged as the two wheels on dry tarmac pulled us up sharply.

Yet another reason for fitting a dash switch to control the centre diff

Happy Christmas all!

Christopher Bell
Devon, UK
1996 1HD-FT

Electronic mail messages entering and leaving Arup business
systems are scanned for acceptability of content and viruses


Hi Christopher
I see you had one of those moments when , there has to be a better way of
doing this(stopping) than that.
You are talking about the centre diff lock switch on the dash just under the
vents for the heater are you not.
Are you saying you pressed this while moving.
When can you use this without doing damage to all those nice gears and bits
in the centre diff and elsewhere.
Do you have to be stationary or can it be used when needed.
Some od the 80s have this switch and some dont why, is it to do with having
an auto box..
Correct me if Im all wrong here please and then shoot me for being myself
This switch marked Centre Diff Lock just under the heater vent is for what
and when.
If the diff centre diff engages automatically when you put the cruiser in
low what is this switch for.
Does it do the same as this seven pin Mod I hear about or do I need another
drink already.
Its just I know the centre diff is locked once you engage LOW and then you
can select if you want the other diffs locked or not, so whats this switch
John C
92HDJ 80 1HDT Rep of Ireland


And a merry Xmas and happy new year to you. Don't over indulge
too much, just the right amount.
It's a known fact that ABS is an enemy on the mud, even worse on
gravel. Gravel with ABS is the reason a lot of 4x4's go off on corners
on the African continent.
Regards, Clive.


I've only once engaged the CDL switch on the move + spinning, and the
"clonk" from underneath persuaded me that this wasn't a good idea. So
no, that's not something I'd normally do.
However if the alternative was running into something ... I'd use it.
I knew that ABS wasn't great on mud and gravel, but I was surprised at
just how bad it was when I had two wheels on dry tarmac.
I was pushing as hard as I could on the brake pedal and we simply didn't
stop, which I find strange as I thought it only pulsed the pressure on
the wheels that were skidding, but I suppose it has to affect the
pressure in the whole system.
I'm seriously contemplating removing the ABS fuse since, for the
conditions I encounter here in winter, I think I'm better off without
it. I can see why African travellers might also do that.
As for the "what's the centre diff lock switch for?" question. I liked
Roman's answer of a while back:
1 wheel spinning: lock centre diff
2 wheels spinning: lock rear diff
3 wheels spinning: lock front diff
4 wheels spinning: stop, as you are just digging yourself into a hole.
Christopher Bell
Electronic mail messages entering and leaving Arup business
systems are scanned for acceptability of content and viruses