What causes a Renault's braking system failure preventing the car from starting?

[LilaDella]

Renault braking system failure preventing the car from starting can be attributed to the following reasons: Air in the system: If the brake pedal gradually rises and feels spongy when pressed repeatedly, but remains low after a brief pause, this indicates air in the braking system. In this case, the braking system should be bled. Excessive clearance: If one press of the brake pedal is ineffective but repeated presses yield good braking performance, this typically indicates excessive free travel of the brake pedal or excessive brake clearance. Adjust the pedal's free travel and then inspect the brake clearance, performing a brake overhaul if necessary. Brake malfunction: If the brake pedal feels firm and not soft, but braking performance is poor, this suggests a wheel brake issue, such as oil-contaminated brake shoes, poor contact, worn friction linings, or uneven brake drum wear. Inspect the brake's technical condition and perform adjustments or repairs as needed.

[StAlex]

I encountered a Renault car that wouldn't start after the braking system reported a fault, which is quite common, mainly due to electronic system issues. Because modern cars like Renault have safety interlock designs, you need to press the brake pedal to start the ignition, preventing accidental rolling and accidents. If the brake system warning light is on and the dashboard displays a warning, sensors like the brake pedal position switch might be faulty—it detects if you haven't properly pressed the brake and prevents the engine from starting. Or, a blown fuse could disrupt power supply; there might also be an ABS module or control unit malfunction causing signal confusion. I once fixed a friend's car where a loose connector caused poor contact. If this happens, don’t force-start it. First, check the fuse box, located under the left-side panel of the driver's seat, to see if any fuses are blown and replace them if needed. If that doesn’t work, call a tow truck immediately and take it to a professional shop to read the fault codes with a diagnostic tool. Randomly disassembling things yourself could make it worse—safety-related issues require careful handling.

[SanAlejandro]

Renault's braking system issues causing failure to start can be really frustrating. When the car won't start, common causes often relate to brake sensor problems, such as a faulty brake pedal sensor. It might mistakenly think you're not pressing the brake, so the ECU prevents the engine from starting. Additionally, braking system warnings might link to the anti-theft system or transmission lock to prevent unsafe operations. I've experienced similar issues with my Renault, caused by aged wiring short-circuiting and blowing a fuse. The diagnostic method is simple: listen for sounds when starting. If there's no ignition response but the dashboard lights up, it's likely an electronic fault. Don't overlook minor issues—Renault's design is quite intricate, and one fault can have a domino effect on other systems. It's advisable for owners to pay attention to dashboard warning lights, perform regular maintenance checks on cable connection points, and ensure they're dry and clean. If the car really won't start, try disconnecting the battery to reset, but professional repair is the most reliable solution.

[Emil]

Brake system failure prevents Renault from starting, posing significant risks. Typically, it's an electronic component issue: a faulty brake switch sends unstable signals, causing the ignition system to fail recognizing the brake status, thus the engine won't start. Other causes include short circuits or blown fuses interrupting current flow. My advice is, if this happens, avoid repeated starting attempts as it may damage more components. Safety first—immediately turn on hazard lights, pull over, and call for towing to an authorized dealership. They use professional tools to diagnose error codes, enabling quick part replacement and repair. Renault vehicles are complex, and DIY repairs carry high risks. Regular attention to brake pad wear and maintenance is crucial—prevention is always better than cure.

[McLillian]

Renault's braking failure causing failure to start is mainly due to weaknesses in the control system. For example, a faulty brake pedal switch sensor can send incorrect signals to the engine control module, causing it to refuse ignition startup. Another common issue is the ABS pump module overheating or being damaged, affecting the entire system. Having repaired many cars, I've found Renault's electrical design to be sensitive, where minor issues like connector oxidation can trigger a chain reaction of faults. Recommended steps for owners: first, check if the brake lights illuminate and whether the dashboard responds when pressing the start button; then inspect the brake fuse in the fuse box, located near the engine compartment. Replacing parts yourself is straightforward, but since brakes involve safety, it's more reliable to seek expert repair—they have scanners for quick diagnostics. Regular cleaning of sensors can help reduce problems.