K 2500 Truck 4WD V8-454 7.4L VIN J SFI (1997)
Brake Master Cylinder: Technician Safety Information
General System Service
WARNING:
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This vehicle has a Supplemental Inflatable Restraint (SIR) system. Failure to follow precautions in Air Bags and Seat Belts could cause air bag
deployment, personal injury or unnecessary SIR system repairs.
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When servicing brake parts, do not create dust by grinding or sanding brake linings, by cleaning brake parts with a dry brush or by cleaning with
compressed air. Many earlier model or aftermarket brake parts may contain asbestos fibers which can become airborne if dust is created during
servicing. Breathing dust containing asbestos fibers may cause serious bodily harm. A water dampened cloth or water based solution should be
used to remove any dust on broken parts. Equipment is commercially available to perform this washing function. These wet methods will prevent
fibers from becoming airborne.
Fluid and Fluid Handling
CAUTION:
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Brake fluid may be irritating to skin or eyes. In case of contact, take the following actions:
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Eye contact - rinse eyes thoroughly with water.
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Skin contact - wash skin with soap and water.
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Brake fluid will damage electrical connections and painted surfaces. Use shop cloths, suitable containers and fender covers to prevent brake fluid
from contacting these areas. Always reseal and wipe off brake fluid containers to prevent spills.
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Brake fluid should always be stored in a closed, sealed container. Never use previously opened containers of stored brake fluid. Always use new
fluid from a sealed container. Reseal brake fluid containers immediately after use. Brake fluid left in an open or improperly sealed container will
absorb moisture. This can lower the fluid's boiling point and result in system contamination, corrosion or deterioration of rubber components.
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Power steering fluid and brake fluid cannot be mixed. If brake seals contact power steering fluid or steering seals contact, brake fluid, seal damage
will result.
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No special fluids are used in this system. However, care must be taken to use the correct fluids on models with a hydraulic booster. The master
cylinder and brake system use brake fluid, while the hydraulic booster system uses power steering fluid. Improper fluid, water or any other
contaminants in the fluid may cause the brake fluid to boil or rubber componentd in the hydraulic system to deteriorate. Swollen master cylinder
piston seals show that rubber deterioration has occurred. Rubber deterioration is also shown by swollen wheel cylinder boots, caliper boots or the
master cylinder reservoir diaphragm. If rubber deterioration is found, replace all rubber components in the system, including the hoses. Also check
for fluid on the brake linings. If any is found, replace the linings. If the brake fluid is contaminated and the master cylinder piston seals are
satisfactory, check for leaks or excessive heat conditions. If no leaks or excessive heat conditions are found, flush the system. Refer to Hydraulic
System. See: Brake Bleeding/Service and Repair/System Flushing
