3 Common EV Brake Issues and How to Solve Them After Automotive School
Electric vehicles (EVs) represent a significant shift in automotive technology, and as a result, automotive school training emphasizes sustainability and innovation. However, like any vehicle, EVs come with their own set of maintenance challenges, especially when it comes to braking systems.
For new automotive technicians, understanding these issues is crucial. This blog post covers three common brake problems specific to EVs and provides practical solutions to help you handle these issues effectively.
1. Reduced Brake Use Leads to Disc Rotor Rusting
EVs primarily use regenerative braking, where the electric motor acts as a generator to slow the car and convert kinetic energy into electricity to recharge the battery. This amazing technology extends brake pad life significantly; however, the downside is that less frequent friction brake usage can lead to rust buildup on the discs.
Diagnosis: A telltale sign is a grinding noise or vibration when applying the brakes after periods of inactivity. You can also visually inspect the rotors for rust deposits.
Solution: There are two approaches. First, a spirited highway drive can sometimes generate enough heat to burn off light surface rust. However, for more stubborn cases, a professional brake service is recommended. This involves cleaning the rotors or, in severe cases, resurfacing them to remove rust and ensure smooth braking performance.
2. Look out for False Low Brake Fluid Alarm After Automotive School
As learned in automotive school, many EVs utilize a hydraulic braking system similar to traditional cars, but with a twist. Here, the system only comes into play when regenerative braking isn’t enough, like during emergencies or when coming to a complete stop. This infrequent use can trigger a false low brake fluid warning light.
Diagnosis: Don’t panic; consult the owner’s manual to understand the specific warning system of the EV you’re working on. Often, the message might indicate a “brake system malfunction” rather than a fluid level issue.
Solution: If the fluid level is normal and there are no leaks, the car is likely detecting inactivity and alerting you. In some EVs, the warning light might reset itself after a complete drive cycle, which involves starting the car, driving it for a while, and turning it off. If the light persists, consult the manufacturer’s service recommendations.
3. Unusual Sounds From the Regenerative Braking System
EVs are known for their quiet operation, yet sometimes, a whirring or grinding noise may emanate from the regenerative braking system. This doesn’t necessarily indicate a major problem but is worth investigating.
Diagnosis: The sound could be caused by normal wear and tear on the electric motor or reduction gears used in regenerative braking. However, debris like small stones lodged between the brake pads and rotors can also mimic such noises.
Solution: Begin with a thorough visual inspection to check for foreign objects lodged in the braking system. If nothing is found, a test drive while listening for the noise at different speeds and braking scenarios can offer clues. Consulting the manufacturer’s manual or contacting their support will provide specific troubleshooting steps for your particular EV model.
Remember, as a new hybrid and electric vehicle mechanic, staying updated on the latest technologies is crucial. EVs are here to stay, and familiarizing yourself with their unique braking systems will make you a valuable asset in the ever-evolving automotive industry. Don’t be afraid to ask questions, consult resources, and continue learning to conquer those EV-braking mysteries!
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