This has already been discussed and debunked… Links to semis using both disc and drum brakes now…
While drum brakes are popular, some trucks use disc brakes. Here’s how they differ:
- Heat handling:
- Drum brakes can overheat on long downhills*
- Disc brakes cool better, reducing brake fade*
- Maintenance:
- Drum brakes need more adjustments*
- Disc brakes are easier to service*
- Performance:
- Disc brakes stop faster in wet conditions*
- Drum brakes can be more powerful when properly adjusted*
- Cost:
- Drum brakes are cheaper to make*
- Disc brakes often cost more upfront*