if the vehicle has hydraulic brakes, pump the brake pedal three times. them apply firm pressure to the pedal and hold for five seconds. the pedal should not move. if it does, there may be a leak or other problem. get it fixed before driving.
You can do a visual inspection and see if there's any leakage or not.
The brake fluid is hydraulic fluid, transmitting the force from the master cylinder and servo, to the brake shoes or pads. If it leaks away, the brakes will not work. The leak MUST be identified and rectified, and the hydraulic system refilled and bled properly.
hydraulic oil
depends on the type. There are hydraulic bike brakes, but most are mechanical.
No. Hydraulic brakes can be either drum or disc brakes, and these two brake types are available as air brakes and air-over-hydraulic systems, as well.
It was 1939 that Ford started to use hydraulic brakes.
Depends. Most bikes don't have any hydraulic components, but some have hydraulic brakes. Usually disc brakes, but there are at least two models of hydraulic rim brakes as well. And it could easily be argued that suspension bikes with oil shocks are hydraulic in design.
Brakes that are actuated by a hydraulic fluid (such as brake fluid). Other types are air over hydraulic (air actuates hydraulics) and pneumatic (air) brakes.
General Knowledge and Combination Vehicles, in all instances. Air Brakes if applicable... it is possible to need a Class A and not need to be authorized for air brakes (for example, something like a Ford F650/F750 with hydraulic brakes pulling a gooseneck trailer with electrically actuated hydraulic brakes). Plus any endorsements you want/need.
No, and it's not really a good method to go about, whether for hydraulic or air brakes. You really need to replace the brake line.
We would need to know what type of brakes you have... S-cam air brakes, air disc brakes, air piston brakes, air wedge brakes, hydraulic drum brakes, hydraulic disc brakes... they're all different.
The brakes in my car are hydraulic.