Why the classic american cars can't have ABS?

I was looking at the Bluebuck's files, and there was something that made no sense to me. It has LAYERS of "enableABS": false. It is on each of the brakes and the front and rear spindles. Why so? The bolide doesn't have ABS, but it is WAY simpler to enable it, as well the Piccolina. You can add a ABS Slot to the Bolide and have working ABS on any vanilla brake, while for the Bluebuck (and I'm pretty sure that is a thing with the Burnside, the Barstow and the Moonhawk) you basically have to force the ABS as enabled on a brake part or it won't work. Is there an explanation for the reason of this discrepancy?

 

Yes, ABS was first used on a production car in 1978, and wasn't a legal requirement until ~2012 in most countries. Realistically a early 60s American car would never have ABS. The only reason why the bolide can have ABS is becauD you have a mod enabled that adds that option to the bolide, otherwise there is no way to have ABS for that car either.
If you want to enable ABS for all cars you can just switch from "realistic" to "arcade ABS" in the gameplay settings.

 

I understand the history part and that they are too old to have ABS. My question is why they forcefully disable the ABS, when, in game, if it is not enabled it is disabled. When you look at the Piccolina brakes, a car that is equally old, it doesnt have a line that disables the ABS function, just like every other car in game.

Compare the Piccolina's front drum brake to the Bluebuck's:

Code:

"autobello_brake_F":{
    "information":{
        "authors":"BeamNG",
        "name":"Front Drum Brakes",
        "value":120,
    },

    "slotType":"autobello_brake_F",

    "slots": [
        ["type", "default", "description"],
        ["brakepad_F","brakepad_F", "Front Brake Shoes", {"coreSlot":true}],
    ],
    "flexbodies":[
        ["mesh", "[group]:", "nonFlexMaterials"],
        ["autobello_brakedrum_FR", ["wheel_FR","wheelhub_FR"]],
        ["autobello_brakedrum_FL", ["wheel_FL","wheelhub_FL"]],
    ],
    "pressureWheels":[
        ["name","hubGroup","group","node1:","node2:","nodeS","nodeArm:","wheelDir"],
        //brakes
        {"brakeTorque":"$=$brakestrength*850"},
        {"brakeInputSplit":1},
        {"brakeSplitCoef":1},
        {"parkingTorque":0},
        {"brakeSpring":80},

        //brake thermals
        {"enableBrakeThermals":true},
        {"brakeDiameter":0.24},
        {"brakeMass":2.75},
        {"brakeType":"drum"},
        {"rotorMaterial":"steel"},
        {"brakeVentingCoef":0.8},
        //brake sounds
        {"squealCoefNatural": 0.0, "squealCoefLowSpeed": 0.0}
    ],
},

Code:

"bluebuck_brake_F": {
    "information":{
        "authors":"BeamNG",
        "name":"Front Drum Brakes",
        "value":250,
    },
    "slotType" : "bluebuck_brake_F",
    "slots": [
        ["type", "default", "description"],
        ["brakepad_F","brakepad_F", "Front Brake Shoes", {"coreSlot":true}],
    ],
    "flexbodies": [
        ["mesh", "[group]:", "nonFlexMaterials"],
        ["bluebuck_brakedrum_FR", ["wheel_FR","wheelhub_FR"], []],
        ["bluebuck_brakedrum_FL", ["wheel_FL","wheelhub_FL"], []],
    ],
    "pressureWheels": [
        ["name","hubGroup","group","node1:","node2:","nodeS","nodeArm:","wheelDir"],
        //brakes
        {"enableABS":false},
        {"brakeTorque":"$=$brakestrength*2500"},
        {"brakeInputSplit":0.5},
        {"brakeSplitCoef":0.5},
        {"parkingTorque":0},
        {"brakeSpring":135},

        //brake thermals
        {"enableBrakeThermals":true},
        {"brakeDiameter":0.28},
        {"brakeMass":8},
        {"brakeType":"drum"},
        {"rotorMaterial":"steel"},
        {"brakeVentingCoef":0.9},
        //brake sounds
        {"squealCoefNatural": 0.0, "squealCoefLowSpeed": 0.0}
    ],
},

The first thing the Bluebuck's brakes do, is to forcefully disable the ABS, while the Piccolina's brakes doesn't. Both of them, in the end have no ABS, but the Piccolina can get a simple ABS slot and get ABS just like the late 80's and newer cars, while the Bluebuck and other old american cars can't.

 

I can assure you this is intentional and it's usual practice to "disable ABS" either in the brakes or in the suspension Jbeam on cars that don't have ABS. You don't need a slot to enable ABS, you can just set it to arcade in the gameplay settings as I said.

 

But why this is only done in the American classics? The Bolide has no ABS, but doesn't get this, neither the Piccolina or the Miramar. Also, the Covet, never had, even before the addition of its ABS slot. Looks like it is reminiscent from the old times, considering those cars have the oldest JBEAMs. Also, the American cars not only disable the ABS on the brake slots, they also disable on the spindles slot

 

Most likely just a coincidence mate, you're looking too much into it