175
BRAKES
CHECKING THE BRAKING AMPLIFIER
IMPERATIVE : Respect the safety and cleanliness requirements.
A: in conformity.
B : not in conformity.
Check the air-tightness.
Start the engine. Stop the engine 1 or 2 minutes later. Press several times but slowly on the brake
pedal.
NOTE : If the brake pedal descends to the floor "a" at the 1st press, but does not descend as far
as "b" at the 2nd press and as far as "c" at the 3rd press, the braking amplifier is air-tight.
With the engine running, press on the brake pedal. Keep the pedal pressed down and stop the
engine.
NOTE : If the reserve travel does not change after 30 seconds of keeping the pedal pressed
down, the braking amplifier is air-tight.
Check the operation of the brakes.
Ignition switched off, press several times on the brake pedal.
Check the reserve travel of the brake pedal.
Press on the brake pedal and start the engine.
NOTE : If the pedal goes down a few millimetres, it is working normally.
Check the vacuum valve.
Remove the vacuum hose.
Confirm that air is circulating in the direction from the amplifier to the engine, but not in the oppo-
site direction from the engine to the amplifier.
B3F2018D
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