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Discussion Starter #1
Hi,

I'm new to the site and upfront, not the most mechanically minded!

I have a 2004 E46 318is. A couple of days ago the brake warning light came on the dash so I thought fine I will take it to the garage to check the next day. On the way to work the day after I was pulling up to some traffic lights, braking fine and then the brake pedal went hard and I couldn't stop! (thank goodness for the handbrake!). As I'm new to the area (Plymouth, Devon) I took the car to a local garage to sort the problem.

The car has full main dealer service history (prior to me and I've had the car 3 months) and I know it has a replacement second hand brake servo fitted. The garage changed the discs and pads but the problem with the hard brake pedal remains! They have tested the servo and it seems ok with no leaks but they can't find the problem! I have looked on various forums and some mention a vacuum pump? When I suggested this to the mechanic he said they were only fitted to diesels and mine is petrol? I'm confused (and so is he!). Can you help please? As already explained, I'm not technically minded enough to know how to solve this and I would really appreciate any help you can give.

Just to confirm, it's a 2004 M-Sport 318i E46 with 76,000 miles on the clock! I have noticed a smell of oil sometimes on start up but thought this was from a seperate leak which the garage has now sorted under the oil filler cap? Sorry again for my ignorance!

Many thanks
 

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ide take it another garage they are fookin thick numptys, all valvetronic engines have vacuum pumps as they dont produce vacuum naturally as they dont use a venturi effect throttle body in normal operation they use valvetronic so cannot produce vacuum...

vacuum pump is on the end of the exhaust cam at the rear of the engine...

 

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Discussion Starter #3
Dailydoggy you are a legend! I knew someone on here would know the answer! Is this a common problem on the E46 do you know? I've did look for a replacement today and I found one for £260 new!!!! I can't bear to think what it is going to cost fitted!!!

Do the symptoms I've posted sound like this could be the cause? He wanted to fit a new brake servo in one breath but said it appeared to be fine in another! Bloody mechanics and his website says that he is a "genuine alternative to BMW" wtf!!!!
 

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ide get it checked its not iffy hosework or pipework first, a half decent garage should be able to check the vacuum supply to the servo or wether the pump is producing any vacuum, ide take it a bmw specialist with N42 engine knowledge myself your prsent garage are retards by the sounds of it...

they can fail tho the pumps but ide check the vacuum hosework first...
 

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Discussion Starter #5
He says that he has checked the pipework using smoke? to check for leaks and can't find anything. He also said the servo seems to be holding vacuum. I will see if I can find someone else! Thanks for your help.
 

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