BrakesModel years 2001–2004Manufacturer
Brake pedal moves or self applies at full steering lock (Hydro-Boost)
Vehicles equipped with Hydro-Boost brake system; the model table lists Yukon 2001 to 2004 together with Escalade, Avalanche, Tahoe, Suburban and others (table layout is partly garbled in the extracted text)
FaultCrate・Brake pedal moves or self applies at full steering lock (Hydro-Boost)
During full-lock or near full-lock turns the brake pedal may move down or self apply.
The cause may be the internal dump valve of the hydro-boost not seating properly because of contamination in the steering system.
Contamination can come from steering pump damage when the wheel is held at the stops for an extended period, or from adding contaminated power steering fluid.
What to do
- The Hydro-Boost system is not serviceable and must be replaced.
Caution
- Before replacing the Hydro-Boost, the entire steering system (pump, lines, cooler, gear box) must be flushed to avoid a recurrence.
- If the vehicle returns with the same concern within 20k miles (= 32,187 km) of the previous repair, replacing the entire steering system is recommended.
In the records
- Hydro-Boost: replaced 9
Applies to
- The model table lists Yukon from 2001 to 2004.
- The bulletin applies to vehicles equipped with the Hydro-Boost brake system.
See the evidence (1 documents, 8 passages)
| Document | Publisher | Date |
|---|---|---|
| [1]23-NA-144: Brake Pedal Moves or Self Applies at Full Turns ↗ | ManufacturerGeneral Motors (published by NHTSA) | 2023-08-18 |
Applies toThe model table lists Yukon from 2001 to 2004.
Yukon 2001 2004— [1] model table
Applies toThe bulletin applies to vehicles equipped with the Hydro-Boost brake system.
Equipped With Hydro-Boost Brake System— [1]
First signsDuring full-lock or near full-lock turns the brake pedal may move down or self apply.
customers may notice during full lock turns or near full lock turns that the brake pedal will move down or self apply.— [1] Condition
Why it happensThe cause may be the internal dump valve of the hydro-boost not seating properly because of contamination in the steering system.
The cause of the condition may be the internal dump valve of the hydro-boost not seating properly due to contamination in the steering system.— [1] Cause
Why it happensContamination can come from steering pump damage when the wheel is held at the stops for an extended period, or from adding contaminated power steering fluid.
Contamination can come from steering pump damage when the steering wheel is being held at the stops for an extended period, causing it to overheat or introduced by adding contaminated power steering fluid.— [1] Cause
RepairThe Hydro-Boost system is not serviceable and must be replaced.
The Hydro-Boost System is not serviceable and must be replaced.— [1] Service Procedure
CautionBefore replacing the Hydro-Boost, the entire steering system (pump, lines, cooler, gear box) must be flushed to avoid a recurrence.
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.— [1] Service Procedure
CautionIf the vehicle returns with the same concern within 20k miles (= 32,187 km) of the previous repair, replacing the entire steering system is recommended.
If the vehicle has been in with the same concern within 20k miles (32,000 km) of previous repair then it is recommended that the entire steering system (including power steering pump, lines, cooler, and gear box) be replaced.— [1] Service Procedure
Put together by FaultCrate from public records and technical documents. The cause and the repair are for the workshop to decide with the vehicle in front of it. Counts are records, not failure rates.
List the records (10 that can be opened)
Records whose recall number, document number or text matches. Each line says why it matched.
- Brake Pedal Movement or Self-Application at Full Turns Technical BulletinManufacturer communication 2023-09-15・document number matches
- Hydro-Boost brake system service informationManufacturer communication 2023-06-13・text contains "brake pedal moves"
- Hydro-Boost Replacement on Full Turn Brake Pedal MovementManufacturer communication 2022-11-21・text contains "brake pedal moves"
- Hydro-Boost brake pedal movement issueManufacturer communication 2020-08-10・text contains "brake pedal moves"
- Hydro-Boost non-serviceable part replacement notificationManufacturer communication 2019-07-08・text contains "brake pedal moves"
- Hydro-Boost replacement for brake pedal self-movement at full turnManufacturer communication 2019-06-10・text contains "brake pedal moves"
- Hydro-Boost Replacement When Brake Pedal Moves or Applies at Full TurnManufacturer communication 2018-02-21・text contains "brake pedal moves"
- Hydro-Boost Brake Unit - Preliminary InformationManufacturer communication 2017-08-15・text contains "brake pedal moves"
- Hydro-Boost Brake System Service CommunicationManufacturer communication 2017-08-15・text contains "brake pedal moves"
- Hydro-Boost Brake System Service CommunicationManufacturer communication 2016-08-24・text contains "BRAKE PEDAL MOVES"