Hummer H2. Manual — part 80

G SENSORS

See Accelerometers.

HOSES

Hoses

HYDRAULIC MODULATORS

Hydraulic Modulators

NOTE: When the part appears to be close to the end of its useful life, replacement may
be suggested.

Worn to, or below minimum
specifications

B

Require replacement.

Condition

Code

Procedure

Attaching hardware broken

A

Require repair or replacement

of hardware.

Attaching hardware missing

C

Require replacement of

hardware.

Attaching hardware not functioning

A

Require repair or replacement

of hardware.

Blistered

B

Require replacement.

Fitting threads damaged

A

Require repair or replacement.

Fitting threads stripped (threads missing)

A

Require replacement.

Incorrectly secured

B

Require repair.

Inner fabric (webbing) cut

B

Require replacement.

Leaking

A

Require replacement.

Missing

C

Require replacement.

Outer covering is cracked to the extent that inner
fabric of hose is visible

B

Require replacement.

Restricted

A

Require replacement.

Routed incorrectly

B

Require repair.

NOTE:

Many modulators can only be replaced as complete assemblies. Whenever
possible, replace the failed component part. If replacement of the failed part is
not possible, then replace the modulator assembly.

Condition

Code

Procedure

Attaching hardware broken

A

Require repair or replacement of

hardware.

1998 Chevrolet Pickup C1500

Uniform Inspection and Communication Standards BRAKE SYSTEMS

HYDRO-BOOSTERS

Hydro-boosters and hydro-electric boosters combined.

Hydro-Boosters

Attaching hardware missing

C

Require replacement of hardware.

Attaching hardware not functioning

A

Require repair or replacement of

hardware.

Connector broken

A

Require repair or replacement.

Connector (Weatherpack type) leaking

A

Require repair or replacement.

Connector melted

A

Require replacement. See note below.

NOTE: Determine cause and correct prior to replacement of part.

Connector missing

C

Require replacement.

Disabled

A

Require repair or replacement.

Electrical failure

A

Require repair or replacement.

External leak

A

Require repair or replacement.

Housing cracked

B

Require repair or replacement.

Inoperative

A

Require repair or replacement.

NOTE: Inoperative includes intermittent operation or out of OEM specification.

Internal leak

A

Require repair or replacement.

Missing

C

Require replacement.

Terminal burned, affecting performance

A

Require repair or replacement. See note

below.

NOTE: Determine cause and correct prior to repair or replacement of part.

Terminal burned, not affecting
performance

2

Suggest repair or replacement.

Terminal corroded, affecting
performance

A

Require repair or replacement.

Terminal corroded, not affecting
performance

2

Suggest repair or replacement.

Terminal loose, affecting performance

B

Require repair or replacement.

Terminal loose, not affecting
performance

1

Suggest repair or replacement.

Threads damaged

A

Require repair or replacement.

Threads stripped (threads missing)

A

Require replacement.

Valve stuck

A

Require repair or replacement.

Wire lead burned

A

Require repair or replacement.

Wire lead conductors exposed

B

Require repair or replacement.

Wire lead open

A

Require repair or replacement.

Wire lead shorted

A

Require repair or replacement.

1998 Chevrolet Pickup C1500

Uniform Inspection and Communication Standards BRAKE SYSTEMS

HYDRO-ELECTRIC BOOSTERS (POWERMASTER)

See Hydro-Boosters.

IGNITION DISABLE SWITCHES

See Switches.

Condition

Code

Procedure

Attaching hardware broken

A

Require repair or replacement of

hardware.

Attaching hardware missing

C

Require replacement of hardware.

Attaching hardware not functioning

A

Require repair or replacement of

hardware.

Connector broken

A

Require repair or replacement.

Connector (Weatherpack type) leaking

A

Require repair or replacement.

Connector melted

A

Require replacement. See note below.

NOTE: Determine cause and correct prior to replacement of part.

Connector missing

C

Require replacement.

Does not apply assist, or inadequate
assist

A

Require repair or replacement.

Leaking

B

Require repair or replacement.

Leaks fluid at fitting

B

Require tightening or replacement.

Leaks fluid at unit

B

Require repair or replacement.

Leaks fluid from pressure hose(s)

B

Require replacement of hose(s).

Leaks fluid into passenger compartment

B

Require repair or replacement.

Threads damaged

A

Require repair or replacement.

Terminal burned, affecting performance

A

Require repair or replacement. See note

below.

NOTE: Determine cause and correct prior to repair or replacement of part.

Terminal burned, not affecting
performance

2

Suggest repair or replacement.

Terminal corroded, affecting
performance

A

Require repair or replacement.

Terminal corroded, not affecting
performance

2

Suggest repair or replacement.

Terminal loose, affecting performance

B

Require repair or replacement.

Terminal loose, not affecting
performance

1

Suggest repair or replacement.

Threads stripped (threads missing)

A

Require replacement.

1998 Chevrolet Pickup C1500

Uniform Inspection and Communication Standards BRAKE SYSTEMS

LATERAL ACCELERATION SWITCHES

See Accelerometers.

LEDS

See Bulbs and LEDs.

LENSES

Lenses

MASTER CYLINDERS

Master Cylinders

Condition

Code

Procedure

Application incorrect

A

Require replacement.

Attaching hardware broken

A

Require repair or replacement of hardware.

Attaching hardware missing

C

Require replacement of hardware.

Attaching hardware not functioning

A

Require repair or replacement of hardware.

Broken, affecting performance

A

Require replacement.

Broke n, not affecting performance

No service suggested or required.

Cracked

A

Require replacement.

Discolored

A

Require replacement.

Leaking

A

Require repair or replacement.

Melted, affecting performance

A

Require replacement.

Melted, not affecting performance

2

Suggest replacement.

Missing

C

Require replacement.

Condition

Code

Procedure

Brake fluid leaking from rear of master
cylinder bore

B

Require repair or replacement..

Brake pedal drops intermittently

A

Require repair or replacement. See

note below.

NOTE: This condition may be normal on some vehicles equipped with anti-lock brakes.

Fluid level low

Further inspection required. See note

below.

NOTE: Refer to OEM procedures for adjusting low fluid level. Inspect for brake
hydraulic system leaks and friction material wear.

Internal valve failure

A

Require repair or replacement.

Master cylinder leaking brake fluid
internally

A

Require repair or replacement.

1998 Chevrolet Pickup C1500

Uniform Inspection and Communication Standards BRAKE SYSTEMS