How does air get in brake lines?

[jv982]

Besides opening a bleader, letting the reservoir on the master cylinder get lor, or cracking a line, how would air get into the brake system?

 

[MAKG]

Through a leak.

 

[jv982]

Would a leak have to allow fluid out, to let air in?

 

[Ranger5.0]

well, short answer, yes...can you see 100% of your break lines, no

 

[michowski]

If theres a leak, that means the line isnt sealed. If the line isnt sealed, then when you push the pedal down it pushed fluid out and allows air in. Its as simple as that.

 

[94STXRanger]

air can get in many ways. through leaks in the pistons/cylinders, old lines cracked or otherwise, if you leave your cap off to long water will be absorbed and the fluid can actually get hot enough to boil, when this happens water will boil and get vapors, or air.