GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 GMC K Sierra - 4WD 🢒 Transmission/Transaxle 🢒 Clutch 🢒 Clutch Pedal Spongy

Diagnostic Aids

If the clutch pedal feels spongy when depressed, inspect for a faulty master cylinder or a faulty clutch actuator.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step inspects the clutch system components and the operation of the clutch system.

    2.

  2. This step inspects for a faulty master cylinder.

    3.

  3. This step inspects for a faulty clutch actuator.

Step

Action

Yes

No

DEFINITION: The clutch pedal feels spongy when depressed.

1

Did you review the clutch symptom operations and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Clutch

2

Inspect the fluid level in the master cylinder reservoir.

Is the fluid level low?

Go to Step 4

Go to Step 3

3

Fill the reservoir with clean brake fluid.

Is the reservoir properly filled?

Go to Step 4

--

4

Bleed the clutch hydraulic system. Refer to Hydraulic Clutch Bleeding .

If the vehicle is equipped with the ZF S6 - 650 manual transmission, there is no bleeding required. You must manually pull up the clutch pedal and pump the system 25 times.

Does the clutch system operate properly?

System OK

Go to Step 5

5

Inspect the clutch master cylinder.

Is the master cylinder faulty?

Go to Step 6

Go to Step 7

6

Replace the clutch master cylinder. Refer to Clutch Master Cylinder Replacement .

Does the clutch operate properly?

System OK

Go to Step 7

7

  1. Remove the transmission. Refer to the following:
    2. •  Transmission Replacement in Manual Transmission NV - 3500
    •  Transmission Replacement in Manual Transmission NV - 4500
    •  Transmission Replacement in Manual Transmission ZF S6 - 650
  2. Inspect the clutch actuator.

Is the clutch actuator faulty?

Go to Step 8

System OK

8

Replace the clutch actuator. Refer to Clutch Concentric Actuator Cylinder Replacement .

Did you find and repair the condition?

Go to Step 9

Go to Diagnostic Aids

9
  1. Install the transmission. Refer to the following:
    2. •  Transmission Replacement in Manual Transmission NV - 3500
    •  Transmission Replacement in Manual Transmission NV - 4500
    •  Transmission Replacement in Manual Transmission ZF S6 - 650
  2. Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 1