There are several signs that you may need to seek out the services of an auto mechanic. Here are two such signs.
Your brakes are noisy
When a car's brakes are in good working order, they should not make any discernible sounds. As such, if you can hear a noise every time you use your brakes to slow down or bring your car to a stop, you should get in touch with a local mechanic who performs brake repairs, as there is probably something amiss with your vehicle's braking system.
The type of sound that the brakes are making may be able to give you some insight into what exactly is wrong with them. For example, if the brakes make a piercing squealing noise when you put your foot on the brake pedal, then it is possible that the brake pads are worn out and are in need of replacement.
Conversely, if your brakes make a grinding sound when you use them, then this might mean that the callipers and rotors are coming into contact with each other. If this is the case, you should not drive your car again until a mechanic has examined it and addressed the problem, as every time you press down on the brakes, you will do more damage to the two aforementioned components of the brake system.
You can see droplets of fluid underneath your car when you park it
If you can see droplets of fluid on the ground underneath the undercarriage of your car every time you park it, then you should seek out the help of a mechanic as soon as possible. Fluids seeping out of your car are a sign that some part of your vehicle has developed a defect or sustained damage which has allowed a leak to occur. If you don't get your car checked out by a mechanic and instead continue to drive it, there is a chance that it may break down during one of your road journeys.
The texture of the fluid may help you to determine where the fluid is originating from. For example, if it has a very slippery texture, it could be engine oil. If this is the case, you should ask a mechanic to locate the source of the leak and patch it up as soon as possible, as driving around when your car's engine oil levels are too low could lead to the engine overheating and its metal parts warping.