What are the reasons for the brake not returning?

[Eugene]

The reasons for the brake caliper not returning are as follows: 1. Poor precision of the caliper, causing the piston to not return properly; 2. Poor precision of the brake pads, being too thick, leading to the piston not returning properly. You can use a steel file to address this. If you don't want to go through this laborious process, replace it with a high-quality assembly; 3. The brake wheel cylinder is an essential chassis braking component of the braking system. Its main function is to push the brake pads, which then rub against the brake drum, reducing speed or bringing the vehicle to a stop. When the brake is pressed, the master cylinder generates thrust to push hydraulic oil to the wheel cylinder, and the piston inside the wheel cylinder moves under hydraulic pressure to push the brake pads.

[LaMary]

I've been driving for over 20 years and have seen many cases where the hydraulic brakes don't retract properly, mainly because the pistons get stuck and can't spring back. The most common issue is rust or sludge buildup inside the brake calipers, especially after rain when muddy water splashes in. Oil and grime accumulation make the piston movement less smooth. Aging seals are another critical factor – rubber components harden and crack over time, causing brake fluid leaks and uneven pressure distribution, which affects retraction. For older vehicles or those frequently driven on rough roads, the return springs can wear out or break, and the brake lines may develop air bubbles or get clogged with debris. Once, I experienced a locked hydraulic brake on the highway – the wheel dragged, overheated, and nearly caught fire, which was quite scary. That's why regular brake system inspections and fluid changes are crucial. Don't cut corners on maintenance; it's best to have it checked every 20,000 kilometers. Safety comes first. Never dismiss minor issues – sudden brake failure while driving is extremely dangerous. I always listen carefully to the wheel rotation sounds to confirm proper operation.

[LeOscar]

As a car enthusiast, I've studied the issue of brakes not retracting multiple times, and the root causes often lie in insufficient lubrication or dirty components. Piston sticking is usually due to uncleaned caliper interiors, where dried-up grime causes the pistons to seize, preventing the brake pads from releasing after braking. Additionally, if the brake fluid is old and not replaced, excess moisture can lead to rust or air bubbles getting trapped, hindering the hydraulic system's pressure return. Damaged springs can also lose their retracting force, especially in modified cars where spring strength may be inappropriate, making problems more likely. This issue can accelerate brake pad wear and cause wheel hub overheating, compromising driving safety. I believe keeping hydraulic brakes clean is crucial—wiping down the caliper area after each car wash and regularly replacing brake fluid to prevent sediment buildup. During inspections, test the brake pedal's rebound speed by gently pressing it; catching issues early saves costly repairs. Losing the joy of driving isn't worth it, so steady maintenance is key.

[SanGavin]

My car recently had an issue with the brakes not releasing properly, causing the wheels to drag and overheat when parked. The mechanic said it might be due to aging seals leaking brake fluid, resulting in the piston not having enough pressure to retract, or the brake lines being clogged with dust, affecting the fluid return. Another common cause is rust, especially if the car is parked outside for long periods and gets wet in the rain, causing the calipers to seize. This seemingly simple issue is quite annoying—after releasing the brake pedal, the wheels still get hot and don’t move smoothly. My husband noticed a slight increase in fuel consumption while driving, and later, we spent some money replacing parts. I think parking the car in dry places can help prevent rust, and washing the undercarriage promptly after driving on dirty roads is important. Don’t underestimate this small problem—if the brakes act up while driving, it could be really dangerous.