Ford 2007 WQ Fiesta Repair Manual page 197

206-00-25 Brake System
-
General Information 206-00-25
DIAGNOSIS AND TESTING
TEST CONDITIONS
53: CHECK BRAKE BOOSTER CHECK VALVE
rn
Disconnect the vacuum hose, for the brake
booster check valve at the intake manifold. Blow
into the hose attached to the brake booster
check valve.
Does air pass through the valve?
+
Yes
INSTALL a new brake booster check valve.
TEST the system for normal operation.
+
No
GO to J4.
54: CHECK BRAKE BOOSTER CHECK VALVE VACUUM
rn
Disconnect the vacuum hose from the brake
booster check valve. Run the engine at idle.
Check the supply with a vacuum gauge.
Is the vacuum pressure above 40.5 kPa (12
in-Hg) with the brake booster non-operational?
+
Yes
GO to J5.
+
No
REPAIR or INSTALL a new vacuum hose and
fittings. TEST the system for normal operation.
55: CHECK BRAKE BOOSTER
rn
Check the brake booster. GO to the component
test procedure in this section.
Is the brake booster OK?
+
Yes
GO to J6.
+
No
INSTALL a new brake booster. REFER to:
(206-07 Power Brake Actuation)
Brake Booster
-
LHD (Removal and lnstallation),
Brake Booster
-
RHD (Removal and lnstallation).
TEST the system for normal operation.
2006.0 Fiesta
1212006
G28494en