Depends on the price.
yes but its better to replace as its usually cheaper.
It would be more cost effective to replace the brake caliper. If you repair the brake caliper it will cost you more in the long run.
No!!
You should replace the head gasket. This repair is critical to the better performance of the vehicle, and to prevent future damage of the engine.
Proteins repair and replace cells.
Honestly, you're better off just to replace it.
if we find some leak of fluidand when we open cover or repair any joint with gasket better we change
You repair or replace any damaged parts.You repair or replace any damaged parts.
Where's the leak? Wheel cylinder, repair or replace, rusted line, replace, master cylinder, repair or replace.
You do not repair them you replace them.
It'll probably be better at a repair shop. You need a lot of expensive supplies to change them yourself, then after that it's easy. A repair shop will probably charge around $700-1000.