Subaru Legacy 2003 Service Manual page 3288

• Damaged diaphragm
• Leak from valve body seal and bearing portion
• Leak from plate and seal assembly portion
• Leak from poppet valve assembly portion
• Loaded air tightness check
1) Start engine and depress brake pedal with pedal
force of 196 N (20 kgf, 44 lb). Keep engine running
until a vacuum of 66.7 kPa (500 mmHg, 19.69 in-
Hg) = point B is indicated on vacuum gauge while
the pedal is still depressed.
( 1 ) ( 2 )
(1) Pressure gauge
(2) Vacuum gauge
(3) Pedal force gauge
(4) Depress
2) Stop engine and watch vacuum gauge.
If the vacuum drop range is less than 3.3 kPa (25
mmHg, 0.98 inHg) within 15 seconds after stopping
engine, brake booster is functioning properly.
If defective, refer to "AIR TIGHTNESS CHECK".
<Ref. to BR-35, INSPECTION, Brake Booster.>
BRAKE BOOSTER
B
( 3 )
( 4 )
BR-00084
BR-37
BRAKE