Banjo Fitting Seals

BBShark

Garage Monkey
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Why do cars have copper washer seals for brake banjo fittings and motorcycles use aluminum with a rubber ID seal?

I have little experience using them with a car but tons of experience with a motorcycle and never had any leakers.
 
brake pressure, 50 billion lbs. for a car, and only 50 for a bike....

figger the square law of fizz-icks......
 
From Pegasus

Soft annealed copper crush washers are most commonly used for brake banjo fittings and to seal brake adapters to spot-faced ports. Aluminum washers are commonly used on fuel system banjo fittings and carburetor adapters

These aluminum washers with molded Buna-N inner seals are much
more reliable than the more common (and somewhat cheaper) steel
Stat-O-Seals. Even if the rubber portion fails to make contact all around
the port, the aluminum will act as a crush washer, providing a reliable
metal-to-metal seal. Use them to seal screws, bolts or plumbing fittings
 
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