F 150 4WD Pickup V8-5.4L SOHC VIN 3 (1999)
Vacuum Brake Booster: Technical Service Bulletins
Brakes - Reduced Power Assist in Freezing Temperatures
Article No.
01-25-5
12/24/01
BRAKES - REDUCED POWER ASSIST DURING
OPERATION IN FREEZING AMBIENT
TEMPERATURES - LIGHTNING MODELS ONLY
FORD:
1999-2001 F-150
ISSUE
Some Lightning model vehicles may exhibit a reduced power assist after the first two or three brake applications during operation in freezing ambient
temperatures. This may be caused by current production routing of the brake booster vacuum hose allowing water to collect in the hose which can freeze
in cold ambient temperatures.
ACTION
Verify condition only occurs during freezing ambient temperatures. Replace existing brake booster hose with a new design service part. Refer to the
following Service Procedure for details.
SERVICE PROCEDURE
1.
Remove existing brake booster hose and discard.
2.
Install new brake booster hose (1L3Z-9C482-AA). Secure new. hose by inserting retainer (included) into the upper hole on the driver's side of the
cowl trim panel (Figure 1).
3..
Road test and verify brake effectiveness.
Parts Block
