Brake System - Hard Brake Pedal On Cold Start: Overview
TECHNICALBulletin No.: 07-05-22-003C
Date: February 09, 2010
Subject: Hard Brake Pedal On Cold Start At High Altitudes (Install Auxiliary Vacuum Pump)
Models:
2008-2009 Cadillac CTS
Equipped With Engine RPO LY7 and Automatic Transmission RPO MYB
Please Refer to GMVIS
Supercede:
This bulletin is being revised to update the terminal part number used from the SPX Kent-Moore Yazaki Connector Kit and to remove the references to the UBEC F25 fuse. Please discard Corporate Bulletin Number 07-05-22-003B (Section 05 - Brakes).
Condition
Some customers may comment on a hard brake pedal. This condition is most apparent in the first 30 seconds to one minute after a cold start and at high altitudes, usually between 1,219-1,829 m (4,000-6,000 ft).
Cause
This condition may be caused by low engine vacuum during warm up.
Parts Information
You must purchase the 12 mm (15/32 in) EPDM hose locally.
Warranty Information
For vehicles repaired under warranty, use:
Disclaimer
