Your brake master cylinder
reservoir is ﬁlled with
DOT-3 brake ﬂuid. See
Overview on page 5-12
for the location of the
There are only two reasons why the brake ﬂuid level in
the reservoir might go down. The ﬁrst is that the
brake ﬂuid goes down to an acceptable level during
normal brake lining wear. When new linings are put in,
the ﬂuid level goes back up. The other reason is
that ﬂuid is leaking out of the brake system. If it is, you
should have your brake system ﬁxed, since a leak
means that sooner or later your brakes will not work
well, or will not work at all.
So, it is not a good idea to top off your brake ﬂuid.
Adding brake ﬂuid will not correct a leak. If you add ﬂuid
when your linings are worn, then you will have too
much ﬂuid when you get new brake linings. You should
add or remove brake ﬂuid, as necessary, only when
work is done on the brake hydraulic system.
If you have too much brake ﬂuid, it can spill on
the engine. The ﬂuid will burn if the engine is
hot enough. You or others could be burned,
and your vehicle could be damaged. Add brake
ﬂuid only when work is done on the brake
When your brake ﬂuid falls to a low level, your brake
warning light will come on. See Brake System Warning
Light on page 3-28.