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NHTSA ID Number: 10226382
Manufacturer Communication Number: PIT3665L
Summary
This Preliminary Information communication advises the technician that the Hydro-Boost is not serviceable and will need to be replaced if the brake pedal moves or applies on its own at a full turn.
Condition / Concern
On vehicles with a Hydro-Boost System, customers may notice during full lock turns or near full lock turns that the brake pedal will move down or self apply. This can be caused by the internal dump valve of the hydro-boost not seating properly due to contamination in the steering system. The hydroboost assembly is not tolerant to certain types of contaminates that may be present in the steering system.
Recommendations / Instructions
The Hydro-Boost System is not serviceable and must be replaced.
275 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
CADILLAC | ESCALADE | 2001-2004 |
| CHEVROLET | ASTRO | 1998-2005 |
| CHEVROLET | AVALANCHE 1500 | 2002-2004 |
| CHEVROLET | EXPRESS | 1998-2022 |
| CHEVROLET | EXPRESS 2500 | 2023 |
| CHEVROLET | EXPRESS 3500 | 2023 |
| CHEVROLET | SILVERADO 1500 | 1998-2023 |
| CHEVROLET | SILVERADO 1500 HD | 2001-2005 |
| CHEVROLET | SILVERADO 2500 | 1998-2023 |
| CHEVROLET | SILVERADO 2500 HD | 1998-2004 |
| CHEVROLET | SILVERADO 3500 | 1998-2023 |
| CHEVROLET | SUBURBAN | 2001-2004, 2016-2019 |
| CHEVROLET | TAHOE | 2001-2004 |
| GMC | SAFARI | 1998-2005 |
| GMC | SAVANA | 1998-2023 |
| GMC | SIERRA 1500 | 1998-2023 |
| GMC | SIERRA 1500 HD | 2001-2005 |
| GMC | SIERRA 2500 | 1998-2023 |
| GMC | SIERRA 2500 HD | 2001-2005 |
| GMC | SIERRA 3500 | 1998-2023 |
| GMC | YUKON | 2001-2004 |
| HUMMER | H2 | 2003-2007 |
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT3665L
Published date: 10/18/2022
MC-10226382-9999.pdf 103.433KB
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NHTSA ID Number: 10178353
Manufacturer Communication Number: PIT3665J
Summary
This Preliminary Information communication advises the technician that the Hydro-Boost is not serviceable and will need to be replaced if the brake pedal moves or applies on its own at a full turn.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT3665J
Published date: 06/26/2020
MC-10178353-9999.pdf 102.195KB
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NHTSA ID Number: 10162149
Manufacturer Communication Number: PIT3665H
Summary
This Preliminary Information communication advises the technician that the Hydro-Boost is not serviceable and will need to be replaced if the brake pedal moves or applies on its own at a full turn.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT3665H
Published date: 06/24/2019
MC-10162149-9999.pdf 102.301KB
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NHTSA ID Number: 10161004
Manufacturer Communication Number: PIT3665G
Summary
This Preliminary Information communication advises the technician that the Hydro-Boost is not serviceable and will need to be replaced if the brake pedal moves or applies on its own at a full turn.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT3665G
Published date: 05/13/2019
MC-10161004-9999.pdf 102.918KB
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NHTSA ID Number: 10129088
Manufacturer Communication Number: PIT3665F
Summary
This Preliminary Information communication advises the technician that the Hydro-Boost is not serviceable and will need to be replaced if the brake pedal moves or applies on its own at a full turn.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT3665F
Published date: 01/23/2018
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NHTSA ID Number: 10113364
Manufacturer Communication Number: PIT3665E
Summary
This Preliminary Information communication advises the technician that the Hydro-Boost is not serviceable and will need to be replaced if the brake pedal moves or applies on its own at a full turn.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT3665E
Date: Jan-2017
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NHTSA ID Number: 10078876
Manufacturer Communication Number: PIT-3665-D
Summary
THIS PRELIMINARY INFORMATION COMMUNICATION ADVISES THE TECHNICIAN THAT THE HYDRO-BOOST IS NOT SERVICEABLE AND WILL NEED TO BE REPLACED IF THE BRAKE PEDAL MOVES OR APPLIES ON ITS OWN AT A FULL TURN.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT3665D
Date: May-2016
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NHTSA ID Number: 10112546
Manufacturer Communication Number: PIT3665C
Summary
This Preliminary Information communication advises the technician that the Hydro-Boost is not serviceable and will need to be replaced if the brake pedal moves or applies on its own at a full turn.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT3665C
Date: Nov-2012
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- Protects against wear and pump breakdown caused by abnormal wear, oxidation, and foaming
- Performs even in sub-zero treatment
- Specifically designed for power steering units
- Keeps power-steering systems running smoothly and helps stop or reduce fluid loss caused by leaky seals
- Formulated with high-quality oil and fortified with additives to revitalize dried, shrunken, and hardened seals
- Developed for use in GM, Ford, Chrysler, and most foreign cars and light trucks
- Anti-wear agents protect pump components
- Corrosion inhibitors to protect metal components
- High quality power steering fluid and conditioner
- Stops Noise
- Stops slipping
- Helps prevent unusual wear
- Protects seals
- The information below is per-pack only
- Premium full-synthetic formulation specifically engineered for Asian vehicles
- Provides protection against wear, foaming, and corrosion to maintain optimal performance
- Designed for extreme temperatures while also providing excellent operation in low temperatures
- Delivers excellent oxidative stability for extended fluid life
- For 2007 and up Honda and Acura vehicles, Backwards compatible with older Honda and Acura vehicles
- Lubricates and reduces wear in the pump, Prevents rust of the steel parts
- Lubricates and fights wear on the gear faces of the turning mechanism (eg. Rack and pinion)
- Protects and cleans the seals and hoses
- Contains no seal swellers
- The service solution for ALL European, North American, and Asian vehicles (Honda fluid recommended for Honda/Acura vehicles)
- Reduces friction and protects seals and hoses - extending the life of the power steering system
- Provides excellent cold and high temperature performance eliminating "morning sickness" stiffness
- Excellent for use in electric hydraulic systems
- Cleans and frees sticky turbines and pumps
- REDUCES NOISE AND SMOOTHES OUT HARD STEERING: A unique dual cavity bottle containing a combination of the best performance additives to repair the most common power steering fluid related problems.
- STOPS LEAKS AND RECONDITIONS RACK & PINION: Power Steering Repair can be used to top-off the existing fluid when low, or add a bottle when changing fluid.
- RESTORES PREFORMANCE: Works on all vehicles, domestic and import.
- ADDS PROTECTION: Compatible with ALL types of power steering fluid or ATF, including petroleum, mineral oil and synthetic formulas.
- REPAIR-IT: Power Steering Repair-It works with all types of power steering fluid or ATF
- Adds Lubricity to help stop wear and improve performance
- Seals and helps prevent small leaks
- Foam inhibitors help extend fluid life
- Keeps seals and O-rings pliable
- Prevents corrosion and squealing under severe conditions
- Protects against pump breakdown
- Not for use in Honda or Acura vehicles
- 1 bottle treats 4 to 5 quarts of oil
- Stops and seals steering fluid leaks
- Works with all types of power steering leaks
- Part number: 1630
SEOCONTENT-START
Bulletin No.: PIT3665L Published date: 10/18/2022 Preliminary Information PIT3665L Brake Pedal Moves or Self Applies at Full Turns Models Brand: Cadillac Escalade Model: Model Years: 2001 – 2004 VIN: from to All All Engine: All All Transmissions: Chevrolet Chevrolet Chevrolet Chevrolet Chevrolet Chevrolet Chevrolet GMC GMC GMC GMC Hummer Avalanche Tahoe Suburban Suburban 3500HD Express Silverado Astro Vans Savana Sierra Yukon Safari H2 2002 – 2004 2001 – 2004 2001 – 2004 2016 – 2019 1998 – 2023 1998 – 2023 1998 – 2005 1998 – 2023 1998 – 2023 2001 – 2004 1998 – 2005 2003 – 2007 All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All All With Hydro-Boost Brake System Supersession Statement: This PI was superseded to update the model years. Please discard PIT3665K. Condition / Concern On vehicles with a Hydro-Boost System, customers may notice during full lock turns or near full lock turns that the brake pedal will move down or self apply. This can be caused by the internal dump valve of the hydro-boost not seating properly due to contamination in the steering system. The hydroboost assembly is not tolerant to certain types of contaminates that may be present in the steering system. Recommendations / Instructions The Hydro-Boost System is not serviceable and must be replaced. IMPORTANT: • Before replacement of the Hydro-Boost System, the entire steering system (including power steering pump, lines, cooler, and gear box) must be flushed to avoid a reoccurrence. • If the vehicle has been in with the same concern within 20k miles of previous repair then it is recommended that the entire steering system (including power steering pump, lines, cooler, and gear box) be replaced. • For vehicles no longer under warranty, inform the customer that replacing the Hydro-Boost unit only, could possibly result in a shorter lifespan of the unit itself and that the customer may choose to replace all other steering system components if desired, at their own expense. Warranty Information For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information. Labor Operation Description Labor Time 2441730 Power Brake Booster Replacement Use Published Labor Operation Time Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. © 2022 General Motors. All Rights Reserved.
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SEOCONTENT-END
Last update on 2025-04-17 / Affiliate links / Images from Amazon Product Advertising API
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