Explorer Sport Trac 4WD V6-4.0L VIN K Flex Fuel (2004)
Brake Master Cylinder: Description and Operation
Brake Master Cylinder
The brake master cylinder is a dual-piston type.
The brake master cylinder is assisted by a power brake booster.
The following conditions are considered normal and not indications that the brake master cylinder is in need of repair or replacement:
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Low brake fluid level detected without signs of leakage. This condition is caused by displacement of brake fluid from the brake master cylinder
reservoir into the disc brake calipers/rear disc brake calipers to compensate for normal brake wear. Fill the brake master cylinder reservoir with
High Performance DOT 3 Motor Vehicle Brake Fluid C6AZ-19542-AB or equivalent DOT 3 fluid meeting Ford specification ESA-M6C25-A.
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A momentary or slight squirt of brake fluid inside the brake master cylinder reservoir upon application of the brake pedal.
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A trace of brake fluid found on the outside of the power brake booster below the brake master cylinder mounting flange. This condition results
from the lubricating action of the brake master cylinder wiping seal.
Warning Switch, Brake Fluid Level
The brake master cylinder fluid level warning switch is an integral part of the brake master cylinder reservoir. It consists of a float containing a magnet
and a reed switch mounted in the bottom of the brake master cylinder reservoir.
When the brake fluid in the brake master cylinder reservoir gets to a predetermined level, the floating magnet actuates the reed switch, causing the red
brake warning indicator to illuminate. Loss of brake fluid will cause this system to activate.
