Yes, rain water can damage components on vehicles such as cars and motorbikes if not handled properly. Although vehicles are designed to withstand a variety of weather conditions, rainwater can still cause problems if it penetrates or damages the vehicle's systems or components. Here are some examples of damage that can be caused by rainwater:

Electrical Systems: Rainwater entering electrical components, such as cables, connectors, or ignition systems, can cause corrosion and short circuits. This can cause problems with the ignition system, battery charging system, or other systems related electrical components.
Combustion System: If rainwater gets into the air duct or combustion chamber, it can affect the combustion process in the engine. Water that enters the combustion chamber can cause the engine to choke, make it difficult to start, or even damage engine components such as spark plugs.
Braking System: Rainwater that collects around the braking components can affect the performance of the braking system. Water getting into the brake discs or drums can reduce traction and extend braking distances.
Suspension System: Rainwater that collects on the road or gets into suspension components can damage shock absorbers, friction springs or other parts. This can reduce the efficiency of the suspension and interfere with driving comfort.
Rust: Rainwater contains oxygen and moisture which can cause corrosion on the metal surface of the vehicle. If rainwater continues to pool on areas prone to rust, such as a scratched vehicle body or damaged surface, the chances of rust will increase.
To prevent rainwater damage to your vehicle, it's best to carry out proper maintenance and cleaning on a regular basis. Make sure to keep the drains and vehicle drainage clean so that rainwater does not stagnate. Also, make sure the protective systems such as windshield wipers, water dampers and vehicle seals are functioning properly. If you park your vehicle out in the open in inclement weather, consider using a vehicle cover to protect the exterior from excess rain.
If you have to drive through rain puddles on your bike, there are a few steps you can follow to minimize the risk of damage to your bike and keep you safe:
Reduce Speed: Reduce the speed of your motorcycle when driving through puddles. High speeds can cause higher water splashes and increase the risk of water entering vulnerable components.
Keep Your Distance: Make sure you keep a safe distance from the vehicle in front of you. This allows more time to respond and avoid larger puddles or sprays of water from the vehicle in front.
Don't Be Tempted to Jump Over Puddles: While jumping over puddles may look fun, it can be dangerous and can damage your vehicle. Strong water shock can cause water to enter into electronic components or cause them to lose balance.
Avoid Deep Puddles: If possible, avoid wading in very deep puddles. Deep puddles can lower the muffler or allow water to enter the exhaust system or other vulnerable components.
Check Brakes After Riding Over Puddles: After driving through puddles, gently apply the brakes to dry out the brake discs or drums. This helps remove any water that may be trapped between the braking surfaces and restores braking effectiveness.
Check Electronic Components: If your motorcycle has been exposed to high levels of water or water has entered any vulnerable areas such as cables, connectors or electronic cases, it is best to inspect and dry the electronic components carefully. If you are not sure or feel there is a problem, it is best to seek help from a trusted mechanic.
Watch for Strange Symptoms: After driving through a puddle, watch for any strange symptoms such as unusual sounds, decreased engine performance, or flashing indicator lights. If you experience these things, immediately check your motorbike or take it to a repair shop for inspection.
Always be careful when driving through puddles and make sure to maintain your vehicle properly to keep it functioning properly in inclement weather conditions.