Tahoe 2WD V8-4.8L VIN V (2004)
8.
Inspect the machined surface that was covered by the master cylinder on the front of the hydraulic brake booster at the location (1) shown for a
stamped number. The stamped number will be a number 1, 2, 3, or 4.
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If a stamped number 1 is visible, then the relief valve must be replaced. Proceed to the next step.
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If a stamped number 2, 3, or 4 is visible, then no further action is required. Proceed to Step 14 and reinstall the master cylinder.
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If no stamped number is visible, then no further action is required. Proceed to Step 14 and reinstall the master cylinder.
9.
Cover the master cylinder with a clean shop towel in order to protect it from fluids or cleaners. Also, place a shop towel under the hydraulic brake
booster to absorb any fluid that may leak out of the unit when the relief valve is removed in the next step.
10.
Using the tool (2) included with the new relief valve, unscrew the original relief valve (1) from the hydraulic brake booster.
Notice
DO NOT blow compressed air into the bore or use any commercially available cleaners to flush the valve bore in the next step. This could
damage the booster or master cylinder.
11.
Inspect the two 0-rings on the original valve for signs of damage. If an 0-ring is missing, broken, or damaged, inspect the bore in the hydraulic
brake booster for any pieces or debris using a non-metallic type tool or a clean "lint-free" towel.
Important
A torque wrench must be used when tightening the valve in the next step. In addition, a 3/8 inch drive to 1/4 inch drive adapter will be needed
if your torque wrench is a 3/8 inch drive.
Important
After tightening the NEW relief valve in the next step, a small gap may exist between the head on the valve and the hydraulic brake booster.
This condition is normal.
12.
Insert the NEW relief valve into the bore.
Tighten
Tighten to 17 Nm (13 lb ft).
