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Κυριακή, 03 Φεβρουάριος 2019 19:15

Brake Pad Wear Indicators


Brake Pad Wear Indicators


Brake Pad Wear Indicators


Brake Pad Wear Indicators


Brake Pad Wear Indicators


Marginalising Hope


Brake wear indicator

A Brake wear indicator is used to warn the user and/or owner of a vehicle that the brake pad is in need of replacement. The main area of use for this is on motor vehicles with more than three wheels. However brake wear indicators are also useful for brake pads in industrial applications, including wind turbines and cranes.

This article refers to disc brakes as an example, but the principle is the same for other types of friction brakes.

Types of indicators

There are different types of wear indicators for brake pads:


Ocular inspection: A cut is made in the pad material to the depth where it shall be replaced. Requires manual inspection of the pads.

Mechanical:[3][4] A metal plate is designed to scratch the brake disk causing a noise when the pad has worn down to the desired level.

Electrical:[5] A metal body is embedded in the pad material that comes in contact with the rotor when the desired wear level is reached. This will light an indicator in the instrument cluster.

Position sensor:[6] A sensor that measures the position of the brake mechanics and indicates to the driver when the desired position has been achieved.

Of the alternatives above the first three are simple and cheap since their lifetime coincides with the service life of the brake pad. The last one is more expensive since the sensors needs to be designed to survive the designed service life of the vehicle. This means that the last alternative is usually only seen on heavy duty vehicles.


The idea is that in all cases alert the driver and/or owner of the vehicle that it is time to replace the brake pads to ensure that the traffic safety is preserved for the vehicle.


Detailed description

Pads B are mounted on carriers G. These are pushed against the rotor A by the piston D which is pushed by the brake fluid E. This induces wear on the brake pads. The rotor A also experiences some wear, but to a lesser extent than the brake pads. The modules C are joined to the cylinder that houses the piston D and acts as counter-force to the piston D.


Sufficient wear to validate a change of brake pads is considered when one of the following cases are applicable:


The gap 1 is no longer visible or soon to be no longer visible.

The embedded sensor in the brake pad 2 contacts the rotor and creates a connection to ground of the sensor.

The metal plate 3 contacts the rotor and creates a noise.

The distance between the cylinder for piston D and the carrier G becomes too large, causing the sensor F to send a signal outside the permitted range through the sensor wire 4, or ground the sensor wire 4 if F is a contact.

F can either be an analog sensor, with an electronic threshold value set to signal an alarm when it has been reached, or an on/off switch, activated at a certain distance.


Under normal conditions, only one of the alternatives are used. Many front wheels on cars are equipped only with wear indicators.

Source: https://en.wikipedia.org/wiki/Brake_wear_indicator


I am a legitimate Greek political dissident struggling:

- For the human right of 1.000.000, on average, innocent Greek and German civilians which die, each year from, supposedly spontaneously manifesting, diseases.

- For the termination of Greece’s dictatorship and non-uniformed military occupation.

- For the termination of illegitimate international treates which violate the human rights of entire Nations, like the May 21th, 1949 treaty.

- For making Greece’s oil and natural gas mineral reserves eligible, also, for making Germany Europe-sufficient in energy resources.

- For contributing in (re-) inventing a medical protocol that completely cures cancer.

- For contributing in Europe’s, military defense and liberation from the existing colonial ties.


Also, I work for materialising certain creative inventions in the robotics domain.


Sadly, instead, of dedicating my time to the above causes, I find my self, externally, obliged to waste my time:


- struggling to collect few euros for replacing, in my private passenger car, certain consumable spare part which do not demand an immediate replacement (see above).

- struggling to earn my food and living in my car while the existing international treaty (which is stronger than the national laws) entitles me having, a safe house to live and the expensess for the basics of living.

- struggling, as having, involuntarily, been, with claustrum-manipulating, brain implanted by the British government, to avoid becoming assassinated; forced-ill; forged-incriminated or slandered; unjustly imprisoned or mentally institutionalised; my car and the rest of my personal belongings, unjustly confiscated.


The negligence of my fellow Greek, and not only, citizens to offer my adequate support, according to my opinion, contributes, also, in the perpetuation of their own sufferings.

The ruthless colonisers keep inventing and promoting to the public opinion fake incidents (e.g. Greek military officers’ hostage situation, middle-range missiles treaty, yellow shirts, Venezuela, etc) on order to dissorient the European citizens. However, the human life, is and shall always be, sacred and invaluable.


Christos Boumpoulis



P.S.: I urgently need support.


Τελευταία Ενημέρωση στις Κυριακή, 03 Φεβρουάριος 2019 19:25