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Brakes
10. Lower the vehicle.
11. Test drive the vehicle, checking for brake pedal
for sponginess or softness. Ensure that vehicle
exceeds 5 km/h (3 mph) for ABS modulator
actuation (self-test) which will purge any air from
the secondary circuit of the modulator. If after
ABS modulator actuation the pedal is still soft or
spongy, then re-bleed entire system.
12. Remove the brake bleeding equipment from the
master cylinder_
Hydraulic Brake System Bleeding
(When To Bleed)
A bleeding operation is necessary to remove air when
it is introduced into the hydraulic brake system.
It may be necessary to bleed the hydraulic system at
all four corners if air has been introduced through
low fluid level or by disconnecting brake pipes at the
master cylinder. If a brake hose is disconnected. at one
wheel, only that wheel caliper needs to be bled. If
brake pipes or hoses are disconnected at any fitting
located between master cylinder and brakes, then the
brake system served by the disconnected pipe or
hose must be bled.
Hydraulic Brake System Flu!;hing ·
The entire hydraulic brake syst~m should be
thoroughly flushed with clean brake. fluid if there is any
doubt as to the grade of the fluid in the system or if
the fluid used contains the slightest trace of mineral oil.
All rubber parts which have been subjected to
contam.inated fluid must be replaced before flushing
the system.
Flushing is performed at each wheel similarly to
bleeding. The new fluid must be forced through the
system until it emerges clear in color. Approximately
one quart of new fluid is needed to flush the system:
After completing the flushing operation at all of
the bleeder valves check that the master cylinder is
filled to the correct level.
Hydraulic Brakes 5-47
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