There are several potential causes for wheels sticking on a brake master cylinder. Here are a few common factors to consider:
Contaminated Brake Fluid: Contaminated brake fluid can lead to the buildup of debris, moisture, or other foreign substances within the brake system. This can result in sticky or sluggish movement of the brake pistons within the master cylinder, causing the wheels to stick.
Corrosion or Rust: Over time, the internal components of the brake master cylinder, such as the piston or bore, can develop corrosion or rust. This can interfere with the smooth movement of the pistons, leading to sticking or binding.
Damaged or Worn Seals: The seals inside the master cylinder play a critical role in maintaining proper fluid pressure and preventing leaks. If the seals become damaged or worn, it can result in irregular movement of the pistons, leading to sticking or binding.
Internal Blockage: Internal blockages within the brake master cylinder, such as debris or a buildup of brake fluid residue, can impede the movement of the pistons. This can cause the wheels to stick or exhibit inconsistent braking performance.
Overheating of Brake Fluid: Excessive heat generated during heavy or prolonged braking can cause the brake fluid to boil, leading to the formation of gas bubbles. These bubbles can create sponginess in the brake system and affect the movement of the pistons within the master cylinder.
To address issues with a sticking brake master cylinder, it is recommended to have the system inspected and serviced by a qualified mechanic. They can diagnose the specific cause of the sticking and perform the necessary repairs or maintenance, which may involve cleaning or replacing components, flushing the brake system, or rebuilding the master cylinder if needed. Prompt attention to these issues is crucial for ensuring safe and reliable braking performance.