TrailBlazer 2WD L6-4.2L VIN S (2003)
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If the brake pipe does NOT have the tooling mark (2), proceed to the next step of the inspection.
6.
Clean and remove any dirt from the left front brake pipe and flare nut (3) where it connects to the ABS modulator under the vehicle. The left front
pipe is on the top row and closest to the center of the vehicle.
7.
Carefully inspect the brake pipe where the pipe goes into the flare nut for the same type of tooling mark (1) as shown above. The mark may be
located at any point around the circumference of the pipe and a mirror flashlight may be required to see it. There will NOT be any of the spiral
lines or grooves (2) in the tooling mark.
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If the tooling mark IS present, then the brake pipe does NOT need to be replaced. Lower the vehicle and install the GM Recall Identification
Label.
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If the tooling mark is NOT present, then the brake pipe must be replaced. Proceed to the Replacement procedure, below.
Replacement Procedure
This replacement procedure should only be performed if the results of the Inspection procedure indicated that the brake pipe needed to be replaced.
Bleeding of the hydraulic system is done using a pressure bleeder and is limited to the left front brake. This pressure bleeding procedure is a shortened
version of the full vehicle procedure found in the Service Manual. As a result, the labor time included in this recall for bleeding the brake system is less.
Important
To avoid unnecessary brake fluid loss, have the new brake pipe ready to install before you begin removing the old pipe.
1.
Disconnect the brake pipe (1) from the left front caliper brake hose fitting.
2.
From underneath the vehicle, disconnect the other end of the brake pipe (1) from the ABS modulator located on the inboard side of the left frame
rail.
3.
Disconnect the pipe from the lower retainers on the frame.
4.
Disconnect the pipe from the upper retainer on the frame.
