SLK 230 (170.447) L4-2.3L SC (111.973) (2000)
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Replace circlip (16b)
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Ensure circlip (16b) is properly positioned.
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Pay attention to different circlips of manufacturers.
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Rub a little methylated spirits into front of diaphragm travel sensor (A7/7b1) so that O-ring slides correctly when inserted.
Inspecting
7. Start engine ID Operate brake several times.
8. Switch off engine.
9. Check diaphragm travel sensor for leaks.
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It should not be possible to hear any air flow noises from the brake booster.
