What are the differences between car oil brakes and air brakes
1. The difference in structure
From the structural point of view, the oil brake structure is simpler, and the space required for installation is also small. It only requires the brake master cylinder, the sub-cylinder, the oil cup and the connecting pipeline, and no other auxiliary equipment is required; the air brake is more complicated than the oil brake. In addition to the brake master cylinder, sub-cylinder, and brake pipeline, there are air pumps, air reservoirs, high-pressure controllers, relay valves and other components, which require more installation space, and in order to ensure safety, the rear brake cylinders are now all Air brake.
2. The difference in braking effect
From the perspective of braking effect, oil brakes have a slower reaction speed, soft brakes, and low strength, while air brakes respond quickly, and brakes are rough and strong.
Therefore, the general oil brakes are mostly small and medium-sized cars, which are small in size, simple in structure, light in themselves, and do not require too much force. In recent years, there has been a trend towards medium-sized cars (loads below 10 tons, some with less than 19 seats) Medium-sized passenger cars use oil brakes). Air brakes are mostly used on large trucks and buses. There is a lot of space in the car, the braking force required is large, the use distance is long, and the response speed needs to be fast. The increased cost is reflected in the entire vehicle and accounts for a small proportion.
Let’s take a look at the working principles of air brakes and oil brakes:
Oil brake: Use the brake master cylinder to pressurize the hydraulic oil, and the pressure can make the brake shoes work in the brake cylinder. In addition to small cars, oil brakes are mainly used on vehicles with relatively small tonnage. This is due to the small oil pressure flow and the limited stroke of the brake pump.
Owners and friends should regularly check the thickness of the brake pads or brake shoes of the car. If the thickness is less than the minimum thickness specified by the manufacturer, replace it immediately. When checking the brake pads, the user should also check the wear of the brake discs or brake drums. If there are dents on the contact surface, the discs or drums should be immediately used to ensure the contact area with the brake pads to increase braking force.
Maintenance method of automobile oil brake and air brake
1. Regularly check the thickness of the brake pads or brake shoes
Regardless of any brake system, the brake pads (disc type) or brake shoes (drum type) complete the braking effect. Therefore, check the thickness of the brake pads or brake shoes regularly. When it is found that its thickness is close to or less than the minimum thickness specified by the manufacturer, it should be replaced immediately. While checking the brake pads, check the wear of the brake discs or brake drums. If there are dents on the contact surface, the discs or drums should be timely to ensure the contact area with the brake pads to increase the braking force.
For vehicles braked by the oil circuit, check the level of brake fluid before leaving the vehicle. If you find that the oil level has dropped, immediately check whether there is a leak in the brake oil circuit. Brake fluid absorbs moisture in the air and will fail over a long period of time. The brake fluid should be replaced regularly in accordance with the manufacturer's regulations. It is best to replace it once a year.
For the air brake system, pay attention to frequently draining the accumulated water in the system and regularly replacing the dryer. The moisture in the air system will corrode the pipeline and affect the braking effect. In severe cases, it can even cause the brake system to fail. In addition, always check the working condition of the air pump and the wear of the air pump belt. If a problem is found, replace it in time.
2. Brake pad replacement cycle
Usually we use whether the brake warning light on the dashboard is on as the basis for judging whether to change the brake shoe, but this is the last bottom line. If it is only changed at this time, it is already quite dangerous. I want to remind you that although all vehicles have this kind of warning system, some of them directly sense the thickness of the brake shoes, and some of them will light up the warning light after the brake shoes have been completely worn out and the brake fluid has dropped extremely. Up. If it is the latter, when the warning light comes on, the metal base of the brake pad and the brake disc are already in the state of iron grinding. At this time, you will see bright iron cuts on the tire near the edge of the rim. Therefore, every time you enter the factory for maintenance, you must check whether the brake pads can be used, and replace the brake pads near the end of their life as soon as possible, instead of just trusting the warning lights.
3. Daily maintenance of the brake system
Clean, high-quality brake fluid is the basis for safety and good brake system performance. You should always buy the best quality brake fluid on the market. If the brake fluid is dirty, drain and flush the entire system, then fill the master cylinder with new fluid. Do not reuse brake fluid. All brake fluid that has been drained from the system should be discarded. In the maintenance of the brake system, regular inspection of the brake fluid level is the most important. Check it at least once a month, the more times it is better.
Inhaling asbestos dust is very harmful to your health. When using a dry brush or compressed air to remove the dust and dirt on the brake system, the dust will be raised. As it easily contains asbestos fibers, it is easy to damage your health. Dust and mud should be dealt with with a vacuum cleaner that specifically removes asbestos, and the dustproof mode should be used. If you don't have a vacuum cleaner, you should maintain the brake assembly in a well-ventilated place and wear a certified anti-virus respirator.
Before checking the brakes, carefully wipe off the dirt on the main cylinder to prevent any dirt from falling into the oil storage tank. Remove the fasteners (usually pins) and covers. For cylinders without a scale, the liquid level should be kept 6 mm from the top of the cylinder. If there is a scale, just keep the liquid level higher than the scale. If the master cylinder needs to be refueled, please add heavy-duty brake fluid that meets the dot3 or 4 specification. Be careful not to put brake fluid on the paint, because it is very corrosive and will destroy the finish.