Normally we using cluch and brake for stopping a vehicle. which is the first one to use cluch or brake?

Use the clutch first. This removes the connection between the engine and the wheels (in lay persons terms), so if you don't use it before you brake then the brake would be fighting against the engine. NO!! When you take your foot off the accelerator, the engine compression acts as a brake and reduces the amount of brake pressure needed to slow the vehicle. Put your foot on the clutch at about the time when the engine speed is back to idle speed - in other Words just before the car stops. Declutching first, as suggested above, not only increases brake wear and stopping time, if the clutch is pressed in at high enough speed, it can actually damage the clutch plate - a very expensive repair. The brake does not fight against the engine, just the opposite - the engine helps the brake.