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air in the hydraulic brake system
Only if it's an air brake system. Otherwise, the presence of air in a hydraulic brake system would not be a good thing, at all.
Air takes more time to flow through the lines than hydraulic fluid.
It will have a dual circuit application air brake system. Some motorhomes may use an air-over-hydraulic brake system.
Brake bleeding is technique used on a hydraulic brake system in order to purge the brake lines of any air bubbles. Removing air bubbles allows for the brake system to function properly.
Air and hydraulic brake systems.
Air will compress under pressure, hydraulic brake fluid doesn't. Air in the system will give you a spongy peddle because of that.
Air in the brake hydraulic system or defective master cylinder.
Air is in constant supply, so a leak in the air system won't necessarily cause a loss of braking power (a downside of the hydraulic brake system).
Brake system bleeding is working on hydraulic brake systems. This is when the brake line has air bubbles in the line. You open the bleed screw on the caliper and pump fluid through the lines until all of th bubbles are gone from the system, an air bubble will steal pressure from the brake system and prevent good operation.
It sounds like your brake system needs to have the air bled out of the hydraulic system. If the fluid leaked out, then air got into the system. Air in the hydraulic system will usually make the brakes feel 'spongey' and somewhat ineffective. If the air is just in one part of the hydraulic system, it can make all of the braking power go to the opposite side. (You may have air in the left side, but have the ENTIRE system bled.)
Pneumatic = Air! There are brake systems that use a combination of both pneumatic and hydraulic components. In those combination braking systems you would use the hydraulic brake fluid that the manufacture specifies.