Fair question mate.
I drive as IMHO a lorry should be driven, using the auxilliary brake (exhauster if it hasn’t been specced with a proper retarder/Jake, most vehicles in this country arn’t properly specced) as the main brake at the correct revs in the correct gear for maximum ■■■■■■, going down through the gears manually to keep the exhaust brake in the correct rev band…you’ll notice on many modern vehicles the green band on the rev counter alters to a much higher rev band once you engage the exhauster.
My philosophy is gears to slow brakes to stop, if i’ve timed things right i won’t have to to use the footbrake at all whilst slowing up, and hopefully will be able to resume progress at a junction without ever coming to rest, if i have to stop then then plan is to only use the footbrake to bring the vehicle to a final halt, i use the exhauster as the primary brake and the footbrake to assist.
If you ever have a vehicle with a proper retarder or Jacob Brake then you’ll find the ■■■■■■ effort from the device to be around 2 to 4 times more effective than a normal exhauster, if you’ve driven a modern Volvo with the 3 stage retarder then you’ll know the sort of effort available by the better devices.
This driving isn’t taught any longer, though the vehicle makers continue to spend serious money providing auxilliary braking, so who’s right?
The reasons for driving like this are many.
Keeps the primary brakes cool for when needed in earnest, this is especially important in hilly areas.
Prevents wear by using the engine and gears as they were designed instead of wearing out brakes for no good reason.
Saves fuel, you will be starting your approach to a junction doing this long before you would by using brakes alone, you might be slowing up for half a mile on the level like this if fully loaded, whilst BTSGTG man will be on power till 200 yards away then braking hard without planning anything.
Driving like this encourages you to look and plan much further ahead than otherwise, it becomes a pride thing where you get annoyed with yourself if you have to brake before you would expect to.
Encourages you to leave a much longer braking space in front on motorways and the open road, because when matey in front brakes you will be slowing on the auxilliary as usual.
Saves tyre wear, only the drive axle tyres will be taking the slowing friction and because the approach is longer there won’t be so much friction anyway.
Your wheels will stay clean, that black ingrained staining all around the steering wheels especially won’t be there, you won’t see many vehicles without brake dust ingrained on the steering wheels, but when you do see one note how its being driven.
One minor point, i have two or three regular MSA stops i use on my regular journeys, Leigh Delamere is one, because i can use the turns into the lorry park for final braking, i can stop the lorry completely without once touching the brakes, that means i can then a feel round all the wheels for early warning signs of binding brakes or hot wheel bearings.
Last but not least its a professional way to drive a lorry, its is after all a lorry not a big car despite the moves to try and make it so, and the vehicle and the forces involved in controlling it should be given the respect it deserves.
There’s probably things i’ve missed out, you’ll find if you want to try this that it leads onto using manual override increasingly in your driving.
Hope that makes sense, it won’t be endorsed probably by the trainers and i know if a certain poster on the main forum sees this they’ll be along with personal comments as he often does (s’ok doesn’t bother me he’s on ignore but sometimes others quote him so i see he’s still addicted), but you did ask, bet you wish you hadn’t bothered now and i’ve tried to answer your very fair question fully.
edit.
just be aware of any vehicle with a decent ‘‘automatic’’ retarder, such as the Volvo mentioned, in winter on icy roads especially but on any slippery surface if driving in auto that sudden harsh ■■■■■■ through the drive wheels can be the cause of nasty problems, i came unstuck, literally, a few years ago driving a FM Volvo with empty trailer.
I’d just got in the bloody thing and going away down the industrial estate in auto, freezing cold morning, well unbeknown to me (hadn’t driven a Volvo for a while) the previous driver had left the retarder on position 3, maximum, and i hadn’t noticed, well as i approached the roundabout it was all black ice covered and yes the bloody lorry dropped about 3 gears and the retarder kicked in and all of a sudden i’ve got a locked drive axle going into an ice covered roundabout, oh bleeding wonderful .
Somehow i manged to straighten the thing up and got round the roundabout without hitting anything, and i still don’t know how.
So, check that bloody retarder is only on when you want it in adverse conditions.