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Do you know that merely observing your brake fluid reservoir in the engine compartment can help you monitor the level of your brake pads?
Sounds somehow?
Naa.

Once i see this, i know my pads are getting low……after confirming there is no leakage.

The braking system of every modern car (not big trucks) works through a hydraulic system.

To break it down simply, once you step on the brake pedal inside the car, it pushes a piston that is assisted by air in the servo that pushes the brake fluid in the brake fluid line running to each wheel. 
The resulting pressure is what acts on the piston in the calipers that push the pads against the rotors forcing them to a stop.
The essence of the air in the servo supplied by vacuum lines from the engine is to make your effort much lighter and the braking results more effective. Though from the beginning to the end of this sequence, car makers have evolved different ways (ABS, EBD, etc) of assisting to driver to improve on his braking for the least minimal braking distance, efforts and effectiveness.
When you change the brake pads newly, if you notice, the brake fluid level rises considerably in the reservoir container as the thick pads force the fluid to cause a back pressure forcing the fluid in the lines back up into the reservoir.
Then as the car is used and the brake pads start going down, the pressure on the line is reduced and the there is more space for the fluid in the brake lines so the level of fluid starts going down in the reservoir. And for most people, they just top it up just assuming it evaporated or rats used it as tea for their lunch in the car. 
This is why is it extremely important that you check your car first for a leakage from the brake system then check the level of your brake pads before refilling your brake fluid reservoir with fresh brake fluid when you notice a drop in its level.
This is because if you don’t follow this procedure, chances are that you will have enough brake fluid in the reservoir and lines but but not enough pads for an effective braking and soon, you might end up driving metal to metal in the brake calipers with the piston pushing an empty brake pad plate against your wheel discs.
Once your wheel discs get compromised, you have to resurface it professionally but mostly have to change it completely…..to “avoid stories that touch the heart “.
If you don’t fix the damaged rotors or change them,  your new brake pads will always degrade easily, will not effectively work and will be giving a serious vibration while in use.
Happy Worker’s Day to you all and may God Almighty crown all our efforts with unlimited blessings.
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