Air Disk Brakes - Page 3 - Truckers' Trucking Forum

830hp C16 · **^ Top** #21 08.19.2009

Quote:

Originally Posted by Agent86

OK, no worries, come explain that to my truck, which just so happens to be european.

i reguarly heat fade the disc.

When the pads get hot and gas up, they fade. anyone telling you otherwise is sadly un-educated in the ways of braking systems..

Having disc on the front axle and drums on the back is problem most of the problem with that Iveco Agent.
Of all the new units going on the road over here 95% will be running disc brakes and we have a lot of hills,disc are the only way to go IMO.

FunkRider · **^ Top** #22 08.19.2009

Drums generally have better initial "bite" but do not dissipate heat well. Disks have less lag and stay cool on long or sudden high speed panic stops. I don't agree with mixing and matching them in an air brake setup on a heavy truck. All or none.

Agent86 · **^ Top** #23 08.20.2009

Quote:

Originally Posted by 830hp C16

Having disc on the front axle and drums on the back is problem most of the problem with that Iveco Agent.
Of all the new units going on the road over here 95% will be running disc brakes and we have a lot of hills,disc are the only way to go IMO.

yer, i agree. But my point was to day that disc doesnt fade is wrong.

Yes its fade point is higher, but it will still go away when abused.

Aside from that, my trucks problem is that its an iveco.

dwmac71 · **^ Top** #24 09.05.2009

yes, discs fade from off gassing of the pads. if you look at high performance car discs they are drilled and slotted to dissipate the gases

BrainHurtz · **^ Top** #25 09.05.2009

The misconception that disc brakes don't fade is a deadly one. Well designed disc brake systems can significantly mitigate the brake fade but it'll still be there. If you've changed your driving habits to assume you'll never have brake fade you'll get yourself into a situation you don't want to be in.

Cross drilled & ventilated rotors significantly reduce brake fade by both venting the gasses as dwmac mentioned and they also take the glaze off the pads kind of like a cheese grater (which is why brake pads wear out something like 3 times as fast as non drilled rotors)

Because of the milage requirements I doubt you'll be seeing drilled rotors on our rigs, pads just wouldn't last. When the new braking rules go in place I wonder if we'll start seeing crygenically treated rotors for trucks.

dwmac71 · **^ Top** #26 09.05.2009

very true, most high performance discs don't last long. discs as large as a truck or aircraft would not last long at all if they were slotted and drilled.

Agent86 · **^ Top** #27 09.06.2009

Quote:

Originally Posted by BrainHurtz

The misconception that disc brakes don't fade is a deadly one. Well designed disc brake systems can significantly mitigate the brake fade but it'll still be there. If you've changed your driving habits to assume you'll never have brake fade you'll get yourself into a situation you don't want to be in.

.

If that was pointed at me, then no i have adapted my driving to the lower braking ability of the truck, combined with the speed that they gas/fade.

dirtyoldman · **^ Top** #28 09.06.2009

Quote:

Originally Posted by Agent86

my front discs on the truck, well, dust the heck out of everything.

and to be honest, i dont think they are any different from drum except they cost heaps to repair

Look at your wheels, with a disk on the front where the dust comes out is right next to the holes in the wheels.

On the back where the dust comes out is back almost even with the inside of the rim, thus it will come off on the road.....you have never seen a drum come off and all the dust in those???

Way different and BETTER. Disk brakes cool faster, and are more effective than drum brakes....ever see a race car with drum brakes???

Cost "heaps" to repair, because the competition is not there, if allot of trucks used them the price would go down.

Quote:

Originally Posted by Allow Me.

Years ago, around The '80,s, the feds tried to require them on trailers. My memory is a little foggy, but they were tried but not very successful and quickly put to rest. I remember they couldn't hold up to heavy duty service. Now, 25 years later, technology is surely better, so who knows.

Had to be anti-lock, hell they are still using drum on the rear of cars in the usa, I doubt someone here was smart enough to try it on the trucks years ago.

K

Agent86 · **^ Top** #29 09.06.2009

Well, i know that its easier to make drums work consistantly. had caliper jam on me last week. couldnt do squat. with an s-cam drum setup, i could have backed it off and not lost $1200 in work.

i believe the truck drums are superior to disc setups, especially when you are in a very dusty or muddy environment.
There is a reason why our roadtrain operators will not run disc brakes on their rigs, and cost isnt it.

BrainHurtz · **^ Top** #30 09.06.2009

Quote:

Originally Posted by Agent86

If that was pointed at me, then no i have adapted my driving to the lower braking ability of the truck, combined with the speed that they gas/fade.

Not at all. It was pointed at anybody that thinks you are off your rocker for pointing out the reality of the situation.

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