Chevrolet Cobalt Service & Repair Manual: Brake System Bleed
| Brake fluid is corrosive to painted
surfaces. Care must be taken not to allow brake fluid to come in contact
with painted surfaces on vehicle. |
| When bleeding the brake system,
always bleed righthand rear wheel circuit first, followed by the lefthand
front, lefthand rear and, finally, righthand front. |
Manual
| Pressure bleeding is recommended
for all hydraulic systems. However, if a pressure bleeder is unavailable,
use the following procedure. Brake fluid damages painted surfaces. Immediately
clean any spilled fluid. |
| 1. |
Remove vacuum reserve by pumping brakes
several times with engine off. |
| 2. |
Fill master cylinder reservoir with
clean brake fluid. Do not let reservoir fall below half full
during bleeding procedure. |
| 3. |
If required, bleed master cylinder
as follows: |
| |
a. |
Loosen master cylinder forward brake
line connection until fluid flows from reservoir, then tighten brake
line. |
| |
b. |
Have assistant to slowly depress brake
pedal one time and hold. |
| |
c. |
Loosen front brake line connection
and purge air from cylinder. |
| |
d. |
Tighten connection and slowly release
brake pedal. |
| |
e. |
Wait 15 seconds, then repeat previous
steps until all air is purged. |
| |
f. |
Bleed rearward brake line connection
by repeating previous steps. |
| 4. |
Loosen and tighten bleeder valves at
all four wheels. |
| 5. |
Bleed calipers or wheel cylinders in
sequence outlined in "Bleed Sequence." |
| 6. |
Place one end of transparent tube over
bleeder valve and submerge other end into transparent container
filled with clean brake fluid. |
| 7. |
Have assistant slowly depress brake
pedal one time and hold. |
| 8. |
Loosen bleeder valve and purge air
from wheel cylinder or caliper. Tighten bleeder screw and slowly
release pedal. |
| 9. |
Wait 15 seconds and repeat previous
steps until all air is bled from system. |
|
Pressure
| 1. |
Loosen and tighten bleeder valves at
all four wheels. |
| 2. |
Install suitable bleeder adapter to
master cylinder using diaphragm type pressure bleeder. |
| 3. |
Charge bleeder ball to 20-25 psi. |
| 4. |
Connect pressure bleeder line to adapter. |
| 5. |
Open line valve on pressure bleeder
and depress bleed-off valve on adapter until small amount of brake
fluid is released. |
| 6. |
Raise and support vehicle. |
| 7. |
Bleed calipers or wheel cylinders in
sequence as outlined in "Bleed Sequence." |
| 8. |
Place one end of transparent tube over
bleeder valve and submerge other end into transparent container
filled with clean brake fluid. |
| 9. |
Open bleeder valve approximately, 3/4
turn and allow fluid to flow into container until all air is purged
from line. |
|
Bleed Sequence
| On models equipped with front
and rear split system, righthand rear, lefthand rear, righthand front,
lefthand front. If pressure bleeding, bleed front brakes together and rear
brakes together. |
| On models equipped with diagonally
split system,righthand rear, lefthand front, lefthand rear, righthand
front. |
Master Cylinder
1.
On Vibe models, remove air filter
hose clamp and hose from throttle body.
2.
On all models, disconnect fluid
le ...
See also:
Chevrolet Cobalt Owners Manual. Steering Wheel Controls
If equipped, some audio
controls can be adjusted
using the controls on the
right side of the steering
wheel.
: Increases or decreases
volume.
: Press to change radio
stations, select tracks
on a CD, or to select tracks and navigate folders on an
iPod® or USB device.
: Press to sil ...
Component Replacement