Thank you Reezvaan. @MT I appreciate that you wish to do the DIY on your car and it is no rocket science either. The only thing I caution against is the brakes. It is one of the few systems in the car that I recommend that a person trained or experienced should look at. I recommend that you put on an old pair of jeans and an old shirt, take the car to the mechanic who you trust and there at the shop replace the brake switch yourself. (if you change it at home and cannot bleed the brakes properly then getting it to the workshop for the purpose may not be a safe drive)
Replacing the switch would involve jacking up the car, lying under the car or removing the front wheel and sticking your head under the fender. Unless the switch was removed fairly recently, you can be sure that there would be a lot of force needed to undo the old switch. Applying this force can make the car unstable if you rely only on the car jack. As a basic rule...ANYTIME that you jack up the car and intend to get UNDER the car even for a quick look you MUST use jack stands or some sort of a block to work as a back-up if the jack fails and the car starts to fall down. (and it does fall down...I have seen it happen so many times.)
If you plan to work on your car on a regular basis i strongly recommend investing in a good quality pair of jack stands or if that is not possible, get two large blocks of wood cut that can be used for the purpose. A four brick square arrangement can also work if those are handy. If you cannot find anything from the above list (e.g if you have to do this on the side of the road) just push the wheel that you have taken off under the car. The last measure is not 100% safe but would probably keep the person pinned under the car, if the jack failed, from getting crushed till help arrives.
I recommend that you WATCH the mechanic bleed the brake system when he works on your vehicle. Watching it in person is better than watching it on Youtube. Bleeding the brakes is a two person job (although there are some gadgets available that allow a single person to accomplish the task. (I haven't used anything like that so cannot vouch for its efficacy)
TIP: I strongly recommend bringing along an old bed sheet, table cover , a sheet of plastic or something to save the seat covers in your car from grease and oil stains. An ounce of prevention is better than a pound of cure.
If you are going to watch the brakes being bled from outside, chances are that the grease covered, mechanics assistant, would be sitting in the drivers seat pumping the pedal as the procedure is completed. (the plastic sheet or the old bed sheet comes in handy at this moment)
After watching the procedure on one or two wheels, if you feel sufficiently confident, you can ask the mechanic to let you bleed a wheel or two. If you get it wrong (and I don't see why, if you have watched closely) the mechanic can always rectify and you drive away with properly functioning brakes.
Good luck!
