Brake problems with C-Class - should Mercedes-Benz cover the repair costs?

I have a 2015 Mercedes-Benz C300 Hybrid with 88k miles on the clock. Reversing off the drive the other morning I realised I had no brakes and had to stamp on the pedal to stop it hitting the kerb on the other side of the road. It was recovered to my usual brilliant local Mercedes-Benz specialist who acknowledged after a few hours that they could see the brake vacuum pump had failed but they couldn't do the repair as it involved disconnecting the hybrid system and they didn't have the kit or the qualifications to do it.

It was then recovered to the main dealer who left it where it was dropped for a week before they diagnosed the same fault. The warranty I took out when I bought it will not pay out as it's not a listed part. I'm therefore faced with a £1062 repair. Is this a known fault in your experience? And do you think it's reasonable for Mercedes to contribute?

Asked on 3 January 2020 by JohnnyLyle

Answered by Honest John
I don't think the warranty insurer behaved correctly here. What will have happened is that the brake servo vacuum pump failed, so you had no servo assistance to the brakes. (Unlike petrol engines, all diesel have to have separate servo vacuum pumps because they can't take the vacuum from the manifold.) This is not a 'wearing' part, so should be covered by the warranty.
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