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5-8
1977 PONTIAC SERVICE MANUAL
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Fig. 5-3 Brake Pedal Mounting
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X
Series
MANUAL BLEED
If the car is equipped with power brakes, deplete the
vacuum reserve by apply the brakes several times.
1. Fill master cylinder with brake fluid and keep at least
one-half full of fluid during bleeding operation.
Bleed right rear brake, left rear brake, right front brake
and left front brake.
2. With the proper size box end wrench or tool
J 21472
over bleeder valve, attach bleeder tube to valve and allow tube
to hang submerged in brake fluid in a clean glass jar. See Fig.
5-2.
3. Open the bleeder valve and fully depress the brake
pedal.
4. Close bleeder valve and release brake pedal.
5. Repeat steps 3 and 4 until all air is evacuated.
Check and refill master cylinder reservoir as required to
prevent air from being drawn through master cylinder.
6. Repeat the bleeding procedure at all wheels if the
entire system is to be bled.
7. Check the brake pedal, feel for "sponginess" and
repeat entire bleeding procedure if necessary.
FLUSHING BRAKE HYDRAULIC
SYSTEM
It is recommended that the entire hydraulic system be
thoroughly flushed with clean brake fluid whenever new parts
are installed in the hydraulic system.
Flushing is also recommended if there is any doubt as
to the grade of fluid in the system. If fluid has been used
which contains the slightest trace of mineral oil, all rubber
parts that have been subjected to the contaminated fluid
should be replaced.
BRAKE PIPES
REPLACE
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