What causes the Malibu brake pedal not to return to its original position?

[McIsabelle]

Internal failure of the brake master cylinder, such as piston sticking, spring breakage, aging or excessive wear of rubber sealing rings, etc., leading to air leakage or the piston not returning to position in time. Relevant information is as follows: 1. Internal failure of the relay valve: Most air brake systems nowadays use relay valves as intermediary components to shorten braking time and release braking quickly. If the internal piston of the relay valve sticks, the spring breaks, or the rubber sealing components are excessively worn or aged, it can cause the brake air pressure to continuously push the brake wheel cylinder, resulting in brake drag. 2. Internal failure of the brake wheel cylinder: Such as internal spring breakage or piston sticking, generally only the assembly can be replaced, and repair is not recommended. Especially for current trucks, which generally use strong spring brake wheel cylinders, without specialized tools, attempting to disassemble the brake wheel cylinder can even lead to serious safety accidents.