After driving through water, you should test your brakes by stopping quickly and firmly from what speed?

After driving through water, it's important to ensure that your brakes are functioning properly, as water can reduce braking effectiveness temporarily. Testing your brakes at a speed of 50 km/h is advisable because it allows you to evaluate their responsiveness without causing excessive strain on the vehicle or putting yourself at risk.

Stopping firmly from 50 km/h is sufficient to create enough stopping force to determine if the brakes have regained their effectiveness while still being a safe speed to manage under normal driving conditions. Testing at this speed balances the need for a clear indication of brake performance while maintaining control of the vehicle.

Higher speeds increase the risk of skidding or losing control if the brakes are not functioning properly. Therefore, the selection of 50 km/h is a prudent choice for this test, ensuring safety and reliability in the vehicle's braking system after exposure to water.