Air brake hoses transmit compressed air between the tractor and trailer to operate service and emergency braking systems.
SAE J1402 is a safety standard that defines pressure rating, temperature resistance, construction, and durability requirements for air brake hoses.
Service hoses (blue) control normal braking, while emergency hoses (red) supply air to release spring brakes and activate emergency braking if pressure is lost.
Common sizes are 3/8” and 1/2”, selected based on airflow requirements and vehicle configuration.
Most SAE J1402 hoses are rated for working pressure up to 150 PSI with higher burst pressure for safety.
Typically every 3–5 years, or sooner if cracking, leaks, or abrasion appear.
Aging, UV exposure, road chemicals, extreme cold, improper routing, and vibration.
No. For safety reasons, damaged air brake hoses must be replaced, not repaired.
Listen for hissing air, apply soapy water to fittings, or observe pressure loss.
They are standardized by SAE J1402, but correct length, diameter, and fittings must match the vehicle.
Typically -40°C to +93°C, depending on hose construction.
They should avoid sharp bends, heat sources, moving parts, and abrasion points.
No. Non-brake hoses are unsafe and not DOT compliant.
DOT-approved clamp fittings, push-to-connect fittings, or threaded hose ends.
Red = emergency line, Blue = service line, preventing misconnection.
Quality hoses remain flexible in cold weather; poor hoses may stiffen or crack.
This depends on hose size but bending too tightly reduces airflow and hose life.
Yes, leaks or internal collapse can reduce system pressure.
By cutting square, installing approved fittings, and tightening to correct torque.
Yes. DOT and SAE markings are required for legal compliance.
