The brakes are not working properly in my new car - what could be the problem?

I have a problem with my Citroen C3. We just bought it last week and I have noticed that every so often (usually when in 1st or 2nd gear) the brakes virtually disappear and when the pedal is pressed to the board there is a grinding noise as if the car is skidding but the car is still very slow to stop. It tends to happen when the clutch is pressed in, when reversing or when switching from 1st to 2nd gear. Is this a serious problem and does anyone know what it is or how to fix it?

Asked on 17 April 2017 by Seamus McLaughlin

Answered by Honest John
Reads to me as if there is an airlock in the hydraulic brake/clutch system. Get it back to the dealer who sold it to you. Might be possible to bleed the airlock out. Might need a new master cylinder. Or, if the clutch slave cylinder is the culprit, a new clutch slave cylinder.
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