Excessive Noise from Power Steering System While Turning or Under Light Braking (Replace Power Brake Booster Inlet Hose)

This bulletin is being revised to change the model years. Please discard Corporate Bulletin Number 02-02-32-005 (Section 02 -- Steering).

Some customers may comment on a whine noise coming from the power steering system while turning or braking.

Replace the power brake booster inlet hose, P/N 15094588. Follow the service procedure listed below.

1. Remove the power brake booster inlet hose from the pump to the hydraulic booster and discard the hose. Refer to the Power Brake Booster Inlet Hose Replacement procedure in the Service Manual (SI ID# 546584).




Important: Routing of the power brake booster inlet hose (1) at the hydraulic brake booster is critical for proper installation.

2. Install and route the inlet brake booster hose (1) from the hydraulic brake booster to the rear of the outlet brake booster hose (2) and under the brake lines (3) and down to the rear of the pump.

Tighten
Tighten the power brake booster inlet hose fittings to 27 N·m (20 lb ft).

3. Bleed the power steering system. Refer to the Bleeding the Power Steering System procedure in the Service Manual (SI ID# 487449).

Parts are currently available from GMSPO.

For vehicles repaired under warranty, use: