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Brake Fluid Testing

Brake fluid should be inspected at every oil change and replaced according to the manufacturer's schedule or when tests indicate contamination. There are several ways to test brake fluid contamination, including using a DVOM to measure voltage from a galvanic reaction, which occurs when moisture mixes with brake fluid and causes corrosion. The DVOM test involves placing probes in the brake fluid reservoir and on the metal housing to obtain a voltage reading that should be below 0.3V for the fluid to pass. Other tests include using a boiling point tester or test strips that change color in the presence of moisture or chemicals indicating the fluid needs flushing.

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377 views1 page

Brake Fluid Testing

Brake fluid should be inspected at every oil change and replaced according to the manufacturer's schedule or when tests indicate contamination. There are several ways to test brake fluid contamination, including using a DVOM to measure voltage from a galvanic reaction, which occurs when moisture mixes with brake fluid and causes corrosion. The DVOM test involves placing probes in the brake fluid reservoir and on the metal housing to obtain a voltage reading that should be below 0.3V for the fluid to pass. Other tests include using a boiling point tester or test strips that change color in the presence of moisture or chemicals indicating the fluid needs flushing.

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Brake fluid testing To test the brake fluid for contamination,

you can use the DVOM-galvanic reaction


Brake fluid replacement is a maintenance test, the brake fluid tester, or brake fluid
item for virtually all vehicles. Consult the test strips. For all three tests, follow the
vehicle’s service information to steps first: brake fluid condition and level
determine the correct intervals for brake should be inspected at every oil change
fluid flushing. Some manufacturers and fluid replaced according to the
neglect to specify this time frame, so you manufacturer’s recommended service
will need to determine the proper schedule, or when it fails the following
interval based on the type of tests. Clean around the master cylinder
environment the vehicle is driven in. in cap to prevent contaminants from
humid or wet climates, the brake fluid entering the reservoir. Remove the
mat need to be flushed every 2 years. In master cylinder reservoir cap. To perform
dry climates, every 4 years might be a DVOM-galvanic reaction test, follow
appropriate. the steps below:
There are several ways of determining if  Set the DVOM to DC volts. Insert
the brake fluid should be flushed:
the red lead in the “v/” slot and the
 Time/mileage: The manufacturer black lead in the “common” slot.
may specify a time/mileage interval for  Place the red voltmeter probe in
flushing the brake fluid. the reservoir brake fluid, and place the
 DVOM-galvanic reaction test: The black lead on the metal housing of the
majority of today’s braking systems use a master cylinder. Make sure to use an
combination of dissimilar metals. unpainted surface of the housing.
Manufacturers use aluminum in pistons
and housing, and steel in brake lines and
 Compare the voltage reading you
obtained to specifications. Less than 0.3V
some wheel cylinders. When moisture
is OK. More than 0.3V means the fluid
mixes with brake fluid, a galvanic
needs to be flushed.
reaction (corrosion) can occur. The
higher the moisture content in brake
fluid, the higher the galvanic reaction
and the greater the erosion/corrosion it
causes. The DVOM-galvanic reaction test
uses a DVOM to measure the voltage
created by the galvanic reaction due to
the level of moisture in the fluid (Figure
2-22).
 Boiling point test: Measuring the
boiling point of the brake fluid using a
special tool can determine the moisture
content of the brake fluid
 Test strip: Measuring specific
chemicals/metals in the brake fluid can
indicate whether there is a chemical
breakdown of the brake fluid. Brake fluid
test strips contain special color-changing
pads that react in the presence of
moisture or specific chemicals that have
built up in the fluid and that indicate the
need for flushing the brake fluid.

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