4WD Hills descent
Submitted: Monday, Feb 13, 2012 at 15:20
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Ianwa
Hi - Until recently I had always had 4WDs with diesel engine and manual.
Getting old and lazy I changed to a used Prado with petrol engine and automatic, works fine but I hate having to ride the brakes when going downhill with the caravan - going down a notch or 2 on the auto makes little difference.
Does "
Hill descent" on recent models help in this respect ?
Thanks for any advice. Ian
Reply By: disco driver - Monday, Feb 13, 2012 at 15:36
Monday, Feb 13, 2012 at 15:36
Hi Ian,
I can't speak for Prado's but with my Disco the "
Hill Descent" button was only for STEEP OFFroad use only, definitely NOT for long descents with a caravan on the back. It would only have any effect at very low speed (<5kph).
Auto's are notorious for poor engine braking, it's a matter of driving with that in mind, but you could try using low range to increase the braking effect of the motor.
I would only consider this (using Low range) if I had a large external auto trans oil cooler fitted as the transmission fluid will get quite hot.
Hope this helps
Disco.
AnswerID:
477651
Follow Up By: Member - Graham Watson (SA) - Monday, Feb 13, 2012 at 16:42
Monday, Feb 13, 2012 at 16:42
I would not use low range on a Prado on a bitumen road because of the risk of getting wind up on the shafts. I have a 90 series auto diesel prado and find that as long as I am going slow enough when I drop the transmission to L or 2 I can maintain a reasonable downhill speed with only occasional feathering of the brakes. Admittedly though I am not towing.
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752902
Follow Up By: disco driver - Monday, Feb 13, 2012 at 19:40
Monday, Feb 13, 2012 at 19:40
Graham,
My Disco has a separate control for locking the central diff so that I can drive in AWD in high or low range and then, if conditions require it I can lock the centre diff and then have 4WD in either High or Low range.
The Prado, being allegedly a superior vehicle to my Disco, I thought would have had something similar, hence my suggestion re low range.
Cheers
Disco.
FollowupID:
752930
Follow Up By: Steve M1 (NSW) - Monday, Feb 13, 2012 at 20:31
Monday, Feb 13, 2012 at 20:31
well Disco, that's because it's a proper 4x4 - whoops!! Forgot myself - I defected to the Evil Empire.
Once a LR man..........yep, have a Prado/auto now. It has it's compensations.....but really, it's like different caravans or campers. One not necessarily better than the other, they just have different strengths/weaknesses.
Phew, might've just scraped out of that one
;-))
FollowupID:
752939
Reply By: Axle - Monday, Feb 13, 2012 at 16:15
Monday, Feb 13, 2012 at 16:15
G/Day Ianwa, As stated
Hill decent is more a off road help,.. On the Black top on long
hill decents with a van behind, have found the five speed auto on the V8 Petrol Cruiser to be very good, changes down automatically when you touch the brakes on a
hill and holds quiet
well, you only have to ride the brakes lightley now and then, thats with about 2.5T behind and the electric brakes adjusted properly.
Cheers Axle.
AnswerID:
477656
Reply By: Kimba10 - Monday, Feb 13, 2012 at 22:03
Monday, Feb 13, 2012 at 22:03
Do you have electric brakes on the van ?? you should be able to set them up so when you dab the brakes on the car the vans brakes are activated if not pulling up enough then put the setting up a tad so they work a bit quicker (without locking obviously)
Hill decent in the prado will only work when you have stopped totally, engaged 4wd low range and have locked in either first or reverse, and engaged centre dill lock,wont work any other way. Presume you either have a 120 VX or Grande or a new 150 GXL to have down
hill assist.......
AnswerID:
477697