Something About Checking And Repair Of Car Brakes
DESCRIPTION OF PHASE
DESCRIPTION OF PHASE
Cars have disc brakes or drum brakes. Some models have front disc brakes and rear drum brakes, while other models have front and rear disc brakes. The most frequent operation is th e replacement of disc brake pads. Also the discs sometimes need replacement.
Another operation is the replacement of the shoes of drum brakes. The replacement of pads, discs and shoes means first removing the wheels of the vehicle. For unscrewing and putting back the bolds of the wheels, wrenches and/or compressed air screw guns are used.
Hand tools such as pliers are used to tighten pads. The repair of rear drum brakes means opening the drums. This may be difficult, since with wear the friction on the shoes may cause a groove on the dr um that blocks opening; in this case the mechanics sometimes use a hammer. Once the drum is open, the mechanics remove the dust inside with a brush. The drum may require minor adjus tments on the lathe or be sent for adjustment at a specialised external firm. The circuit of the brake system has oil for the hydraulic system.
EQUIPMENT AND MACHINERY
Screw gun
This is a compressed air device for screwing and unscrewing.
RISK FACTORS
Exposure mixed dust and asbestos dust
During the repair and cleaning of the brakes of vehicles, dust from the material forming the brakes and other harmful dust due to road traffic (solid particulate etc.) may spread. If cleaning is conducted with compressed air the spread of dust is greater. At the time of opening of the drum, especially when a hammer is used, flying dust may fall on the mechanics and spread in the work environment. The dust inside the drum is formed by the material from worn brakes (containing fibreglass, cellulose, carbon fibres, graphite etc.), with considerable amounts forming a pile.
Before the law on asbestos came into force, the material forming the brakes also contained asbestos fibres. There may still be asbestos during repair and cleaning with compressed air of the brakes in older vehicles, although after ordinary maintenance, the brakes of older vehicles have now been replaced. Given the particular danger of asbestos fibres, attention for this risk factor is required.
Use of manual equipment
The use of hammer, pliers etc. may involve risks for the hands.
Exposure to noise
The screw gun produces significant noise.
Exposure to vibrations
The screw gun produces significant vibrations.
Handling of liquid for brake circuits
Brake liquid is classified as corrosive.
EXPECTED AND RECORDED HARM
In case of spreading of dust when the drum is opened, the mechanics may suffer from harm to the eyes. Exposure to dust from the brake material may cause harm to the respiratory system (pneumoconiosis). Exposure to dust containi ng asbestos fibres causes asbestosis. In case of accidental contact during the use of hand tools, the mechanics may suffer from traumatic injury (injuries, crushing contusion) to the hands. Exposure to noise can involve d eafness and collate ral problems. Exposure to vibrations may involve the Raynaud Syndrome. Skin contact with brake liquid may cause skin irr itation, and in case of prolonged contact, eczema.
PREVENTIVE MEASURES
In order to reduce exposure to dust, the information and training of workers is required, with the use of PPD (mask, gloves, glasses, overalls), and avoid the cleaning with compressed air, using an industrial aspirator instead.
In order to avoid skin contact with the oil of the brake circuit it is necessary to use PPD (gloves, glasses, overalls), and avoid k eeping oily rags in pockets. In order to reduce the risk of accidents to the hands during the use of hand tools, the information and training of workers is required, and use gloves.
In order to reduce exposure to noise and vibra tions, compressed air screw guns must be sound-proofed and with low vibrations. According to the level of exposure, workers must be informed, trained and wear PPD for the protection of hearing (earplugs, earpieces, gloves).
by: Amos
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