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#31
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Setting Toe
jim beam wrote:
> Dave and Trudy wrote: <snip> >> Just one question...If disks are so much better, why do the large >> trucks and tour buses still use drums on all axles? I know there are >> some exceptions but most use drums. I hadn't really considered this >> until your above comments... >> >> Dave D >> > very few of the modern tour buses use drums these days, or at least, not > on the front. > > the main reason drums are still used on large trucks, especially big > rigs, is because of the air brake thing. unlike cars and lighter > vehicles, they're "fail safe" which means their "natural" position is > full on as opposed to off like a car. strong springs inside the drums > press the shoes real hard against the drum, and the air system actuates > against the springs to hold the shoes off the drum so the vehicle can > roll. if the braking system fails, the brakes come on, and the 30+ ton > cargo comes to a halt. hopefully. "fail safe" is much more complicated > to implement on disk brakes, but real simple inside a drum. plus imo, a > lot of domestic truck manufacturers are not exactly innovative pioneers > in the engineering department - the quality of the chrome plating seems > to get more attention from what i can see. Plus interstate buses and 18-wheelers are seldom bought on the strength of some advertising campaign (as opposed to passenger vehicles), IMHO anyway. |
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#32
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Setting Toe
Sparky Spartacus wrote:
> Plus interstate buses and 18-wheelers are seldom bought on the strength > of some advertising campaign (as opposed to passenger vehicles), IMHO > anyway. sure they are! durability, low maintenance costs, that kinda thing. makes the beancounters that buy the fleet truck purchases feel all warm inside. |
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