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BRAKES
5 - S
(6) R e b u i l d booster v a c u u m reserve as follows: Re-
lease b r a k e pedal. Increase engine speed t o 1500
r p m , close t h e t h r o t t l e and immediately t u r n off i g -
n i t i o n .
(7) W a i t a m i n i m u m o f 90 seconds and t r y b r a k e
action again. Booster should provide t w o or more
v a c u u m assisted pedal applications. I f v a c u u m assist
is not provided, perform booster and check valve vac-
u u m tests.
POWER BOOSTER CHECK VALVE TEST
(1) Disconnect the v a c u u m hose f r o m check valve.
(2) Remove check valve and valve seal from booster
(Fig. 1).
(3) H a n d operated v a c u u m pump can be used for
test (Fig. 2).
(4) A p p l y 15-20 inches (50-67 kPa) v a c u u m a t large
end o f check valve (Fig. 1).
(5) V a c u u m should h o l d steady. I f gauge o n p u m p
indicates a n y v a c u u m loss, valve is f a u l t y and m u s t
be replaced.
BOOSTER
CHECK
Fig. 1 Vacuum Check Valve And Seal (Typical)
Fig. 2 Hand Operated Vacuum Pump (Typical)
POWER BOOSTER VACUUM TEST
(1) Connect a v a c u u m gauge t o t h e booster check
valve w i t h a short l e n g t h of hose and a T - f i t t i n g (Fig.
3).
(2) S t a r t a n d r u n engine a t idle speed for one
m i n u t e .
(3) C l a m p hose shut between vacuum source a n d
check valve (Fig. 3).
(4) Stop engine and observe v a c u u m gauge.
(5) I f v a c u u m drops more t h a n one i n c h H G (33
m i l l i b a r s ) w i t h i n
15 seconds, either booster dia-
p h r a g m or check valve are faulty.
SHORT
CONNECTING
CHECK
VACUUM
GAUGE
J9005-81
Fig. 3 Typical Booster Vacuum Test Connections
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