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Some do. although the primary reason that more don't is that disc brakes weigh a lot more than drums, as well they do cost a lot more. The more weight you have the less you can haul. In my opinion discs are more reliable and provide better safety than drums, but it is hard to argue with economy.
What else can I help you with?
How big is a big rigs blind spo?
How big is a big rigs blind spot
Are there big rigs that drives by it self?
No.
Does all big rigs have air brakes?
Yes, they do. That "electronic" system referred to in European trucks is a control system known as EBS (Electronic Braking System), and is a better system than ABS (Antilock Braking System), but is not compliant with US FMVSS121 regulations as a standalone system. That's a control module - the Euro trucks still use air brakes.
Do you use the keyboard in Big City Rigs?
yes
What are the ratings and certificates for Big Rigs Over the Road Racing - 2003 VG?
Big Rigs Over the Road Racing - 2003 VG is rated/received certificates of: USA:E
What are the release dates for Top Gear - 2008 Big Rigs 2-9?
Top Gear - 2008 Big Rigs 2-9 was released on: USA: February 2012
What is the maximum speed limit in California highways for big rigs?
55mph
What the worst game on the computer?
Big Rigs: Over The Road Racing
What are the release dates for Big Rigs Over the Road Racing - 2003 VG?
Big Rigs Over the Road Racing - 2003 VG was released on: USA: 20 November 2003 (PC version)
What are the release dates for Top Gear USA - 2010 Big Rigs 2-9?
Top Gear USA - 2010 Big Rigs 2-9 was released on: USA: 14 February 2012
When did Big Blue Disk end?
Big Blue Disk ended in 1998.
When was Big Blue Disk created?
Big Blue Disk was created in 1986.
