SAFETY Precautions

Asbestos

Found in older brake and clutch friction material

· It might take 30-35 years before you have problems, started with shipbuilders who first noticed they all had asbestos exposure in common years earlier

· Unsafe if airborne

· Size that hurts is 3 microns, which you cannot see, i.e. human hair is 9 microns

· Never blow compressed air on brake parts DO NOT GET AIRBORNE

· Never wire brush brake backing plate, use liquid or special vacuum to get rid of it

· Takes 24-48 hours to drop from 6 feet high, so it stays around for a while

· Brake Clean- spray first at backing plate from a distance to wet down so you don’t make airborne

· Wash hands

Batteries

· Charged liquid in battery is electrolyte. This liquid has acid in it and will destroy clothing. The gas produced by a charging battery is hydrogen. Two characteristics of hydrogen we need to know about is:

· Explosive

· Lighter than Air

· Safety glasses must be worn when working around a battery

· Avoid any kind of spark around a battery.

· Proper polarity – when hooking up battery charger

· Positive to positive; negative to negative

· Battery Charger Hook-up:

· Insure proper polarity

· Proper voltage, 12 volt, 6 volt or 24 volt

· Make sure charger is turned “OFF” when connecting or disconnecting

· (Rate of charge) In this class, Do not allow the ammeter to read higher than 20 amps.

· This minimizes amount of hydrogen produced and keeps the system voltage from rising too high. Battery voltage should be 12.6 volts, charging system voltage is usually around 13.5 to 14.5 volts.

· What is the maximum that typical 12-volt solid-state equipment can handle? 16 volts

· Last connection should be made away from battery at grounded place where the spark will not occur near the battery.

Lifting an Automobile:

Important

1. DO NOT GET UNDER CAR WITHOUT SAFETY STANDS!

2. Do not block tires when raising one end of car- or put brakes on.

Put vehicle in neutral.

3. Steering wheel unlocked, but ignition is turned to the “OFF’ position.

BRAKE FLUID D.O.T. 3, 4, 5

· DOT 3. & 4 are glycol based, clear color; eats paint, DO NOT SET CAN ANYWHERE ON CAR! 4 has a higher temperature rating than 3

· “Hydroscopic” – affinity for (attracts) moisture, which when in the brake system will lower boiling point; and raises freezing point

· NEVER GET NEAR PAINT IT EATS PAINT

· Petroleum products when mixed with petroleum products will cause any exposed rubber to swell

· Examples of Petroleum products: trans fluid, engine oil and power steering fluid.

· DOT 5 silicone base; purple color; does not eat paint highest temperature rating

· It is not hydroscopic (will not eat paint); more expensive

· If mixed DOT 5 and 3, DOT 5 has water bubbles, can’t flow through lines

DRY BOILING POINT--- the boiling point of fresh brake fluid right out of the can

1. 500 degrees

WET BOILING POINT---boiling point of brake fluid with moisture in it

1. 325 degrees

FLUID LEVEL

· 1/4 IN. FROM TOP

· If you get brake fluid on the car, get off with lots of soapy water, don’t wipe when dry

· H. P. Accumulator

· High Pressure Accumulator – 1100 psi Nitrogen Precharge

· Has a rubber diaphragm – has 2500 psi pressure switch

*****DO NOT BACK-FLUSH THROUGH THE MASTER CYLINDER*****

· To check fluid with H P Accumulator, pump brakes until they get hard, that’s where you check fluid level.

· What happens if you don’t ? Overflows when brakes are pumped.

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