Can air get into the clutch hydraulics system without water getting out?

Question

If clutch fluid comes out of the clutch hydraulics system then obviously air will get in.
Is there a for air to get in even if water is not leaking out?

After bleeding the slave cylinder  we forgot to top up the clutch fluid and drive the car  for 20 minutes.  Would this have caused air to get in?

What if the clutch fluid was low though not empty, would that cause air to get in?

When you bleed a slave cylinder, should you be seeing any fluid in the clutch container. If it returns there what does this mean?

Thanks.

Weather Vane · Answer

If you are topping up the hydraulics with water, you should drain it immediately, flush with hydraulic fluid, refill and bleed. 1a. Air can seep in past the cylinder seals in small amounts, which builds up over time. The more aged the seals become, the more air seeps in. So the seals need replacing at some time, although it is safer to replace the complete cylinders.

Perhaps.

Probably not.

There should be hydraulic fluid in the reservoir at all times. When you bleed the clutch or brake system, some of the fluid is lost, so you should keep an eye on the reservoir and keep it topped up to the correct level.

Can air get into the clutch hydraulics system without water getting out?

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