What causes low return air pressure in Dongfeng Tianlong?
4 Answers
Low return air pressure in Dongfeng Tianlong may be caused by abnormal return sensors. Hazards of low tire pressure 1. Increased fuel consumption: Maintaining proper tire pressure can reduce fuel consumption by 3.3%. When tire pressure decreases by 30%, fuel consumption increases by 5%~10% at 40km/h. A single tire underinflated by 40PSI will reduce its lifespan by 10,000 kilometers and increase total fuel consumption by 3%. 2. Accelerated tire wear: Underinflated tires experience more wear, shortening their service life. Both overinflation (center wear) and underinflation (edge wear) negatively affect tire longevity. 3. Increased risk of blowouts: Low pressure causes excessive heat buildup during driving, which is the main cause of tire blowouts. Insufficient pressure leads to excessive sidewall deformation, generating heat that may cause tread separation. 4. Abnormal vehicle vibration: Underinflated tires reduce road adhesion, causing severe shaking on uneven surfaces and compromising ride comfort by failing to absorb road impacts. 5. Weakened braking performance: Low pressure increases tire deformation and rolling resistance. During hard braking, the sidewalls may contact the road, reducing effective traction despite the apparent larger contact area.
I used to drive Dongfeng Tianlong trucks for long-haul transportation and encountered several instances of low circuit air pressure. The most common issue was air leaks in the tubing system, such as aging and cracked rubber gaskets at pipe joints or rusted and perforated metal pipes. Another frequent cause was a malfunctioning or inefficient air compressor—internal piston wear or a loose belt could lead to insufficient air supply. A faulty air pressure regulator could also cause significant pressure fluctuations, often dropping to low levels. I remember once driving on a mountain road when the pressure gauge suddenly dropped, and the brakes felt soft. After pulling over, I found that the rubber hose on the front brake chamber had ruptured and was leaking. Replacing the hose solved the problem. My advice is to use soapy water to check for leaks by listening for hissing sounds after parking, and to regularly drain water from the air reservoirs to prevent similar issues. Safety comes first—low air pressure can severely affect braking and is very dangerous.
I have been engaged in truck maintenance for many years and have dealt with low air pressure issues in Dongfeng Tianlong trucks numerous times. The main faults include air leaks caused by aging pipelines, loose joints, or failed seals leading to gas escape. Compressor issues such as belt wear reducing driving efficiency or internal cylinder damage resulting in insufficient air supply. The pressure regulator may malfunction, failing to maintain normal pressure. Excessive water accumulation in the air reservoir occupies space, preventing the pressure from rising. Inspection steps: Start the vehicle and listen for abnormal compressor sounds, check the speed of pressure gauge rise—if slow, use the soap bubble method to locate leaks and promptly replace damaged parts. The compressor belt tension should be moderate. Replace the regulator or valve directly if problematic. Preventing low air pressure ensures the braking system remains safe and reliable.
When I was driving a Dongfeng Tianlong truck for cargo transport, I encountered a situation with low air pressure, which was quite nerve-wracking. The braking felt insufficient. Upon inspection, I found a loose air hose connection that was leaking. The repair shop replaced it with a new joint, and the problem was solved. Sometimes, if the compressor is broken, not working, or not supplying enough air, it can also cause this issue. I suggest not ignoring the dashboard warning—stop the vehicle immediately to check for any hose damage or air leaks, and ensure the compressor is functioning properly. If there's a problem, have it repaired by a professional. Low air pressure affects braking performance, so timely handling is crucial for safety.
