Renault Laguna III Manual page 2369

MECHANICAL COMPONENT CONTROLS
Braking assistance circuit: Check
a Connect a vacuum pump to the end of the non-re-
turn valve.
a Activate the vacuum pump a few times.
a Check to see if the pressure drops. If it does, there is
a hole in the non-return valve. Change the non-re-
turn valve (see 37A, Mechanical component con-
trols, Brake servo non-return valve: Removal -
Refitting, page 37A-4) .
F4R, and 800 – K4M or M4R or V4Y
a Connect the non-return valve to the intake distribu-
tor.
IV - CHECKING THE VACUUM PUMP
K9K or M9R or V9X
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a Connect the external vacuum pump to the engine
vacuum pump.
a Start the engine.
a Check the following values:
- 550 mbar in 5 seconds at an engine speed of 700
rpm,
- 700 mbar in 3 seconds and 900 mbar in 5 sec-
onds at an engine speed of 4050 rpm.
a Replace the vacuum pump if the values are different
(see 37A, Mechanical component controls, Vacu-
um pump: Removal - Refitting, page 37A-14) .
a Connect the non-return valve to the vacuum pump.
37A-35
37A
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