Quote:
Originally Posted by wparsons
What makes the pedal go to the floor in a drum system if it isn't air in the lines (from boiling fluid)?
|
Expansion of the brake drum beyond the limit of the stroke of the wheel cylinder.
The single advantage of disc brakes when first introduced into racing cars was that the brakes never "failed". They might require higher line pressure as they got hotter but they never disappeared entirely. Drum brakes could fade to zero braking force. This is an important difference.
Drum brakes are actually still adequate for rear brakes on street cars, not so front brakes.
Four wheel discs are now standardized for economic reasons, production costs are comparable but rear drums are now too expensive to service.