Happened twice now, suddenly braking for traffic lights that are changing to red, and the car just isn't stopping! I brake but it still tries to move, I put the handbrake on and its still trying to move. What is this? It's a BMW 320i, used, 2012 model, its an automatic. I'm worried that I'm going to have an accident or get flashed/recorded and done for going through a red light, even though I don't fully go through it I get into the junction before the car eventually stops. Also worried this could be a very serious and expensive fault. It only seems to happen when braking suddenly. Happened before at a roundabout and I nearly went into the guy in front. Brake pads both front and back are new. I tried replicating this the first time on a side road but couldn't, so I think it literally just is after braking sharply.
I had a similar issue with a works diesel Peugeot Boxer van in the mid 1990's. Usually the brakes were excellent, but the odd time they were terrible.
I finally figured out that if I was pressing the brake pedal on 3 or 4 occasions when approaching a junction, that would use up all the vacuum, so on the next press nothing happened apart from getting a very firm brake pedal. It wasn't building up vacuum quickly enough, unless you put your foot on the clutch and revved it!
In my case, it was a faulty brake vacuum pump. Garage fitted a new pump and that solved the issue. Once I was able to work out when the brakes were failing, it was easy for the garage to fix it.
So, I wonder if it's a lack of vacuum/ or servo issue.
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