Lotus TURBO ESPRIT Service Manual page 316

Page 70
JB.
8
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BRAKE SERVO UNIT
The 'Supervac' brake servo is, with the exception of the a i r f i l t e r and non return
valve, a non-servicable sealed unit which must be replaced
i f
found to be faulty.
The a i r f i l t e r (surrounds input push rod) should be replaced whenever the brake
system
i s
overhauled, and cleaned or replaced more frequently
if
the vehicle i s
operated i n d u s v conditiom. The f i l t e r is supplied together w i t h the input dust
cover and servo/master cylinder
'0'
ring i n the servo 'service k i t ' A075J6033F.
The vacuum non-return valve
i s incorporated into the vacuum hose elbow connector
i n the front case of the servo unit. The valve i s a push f i t into a grommet, and i s
supplied complete with new grommet. Use the grease supplied to lubricate the ribs
of the
NRV
before assembly.
As a quick check of servo operation proceed as follows:
W i t h engine stopped, press the bmke pedal several times to exhaust the servo unit
of vacuum. Keeping the pedal pressed (which should be 'hard' and 'high') start
the engine; the pedal should drop
slightly
as the servo vacuum builds up.