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General E46 Forum
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Old 01-06-2015, 05:39 AM   #1
huskyrossy
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Urgent !! NO BRAKES! Oil on check valve by booster

I need urgent help. I was driving home last night and my brake pedal went hard as I tried braking so I needed to use the handbrake to get me home.
All the brake assist has gone, but as I carried on driving the stiffness dropped slightly as I came to the next junction and had a little bit of brake assist but not normal and then returned solid again.

I disconnected the check valve off the booster and do have some vacuum as I place my finger on the end but I'm not familiar with these things so it could be normal vacuum pressure or it may not be enough? But I'm unsure of how much it should suck, but it does have suction

Also when I had the check valve off the booster there was black oil around that site

I do have an oil leak from the rocker cover gasket which I need to do ASAP but not sure on the vacuum pump itself

Can someone please help me diagnose this braking problem

Thanks
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Old 01-06-2015, 09:22 AM   #2
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There has been an increase of brake booster diaphragm failures lately due to the age of our cars according to jfoj.
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Old 01-06-2015, 09:41 AM   #3
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There has been an increase of brake booster diaphragm failures lately due to the age of our cars according to jfoj.
Yeah, Most likely what has happened is a failed brake booster.
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Old 01-06-2015, 01:45 PM   #4
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Typically with a failed or torn brake booster diaphragm, you can hear the whistling or whooshing sound of vacuumed air passing over the tear. Does yours have that issue?
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Old 01-06-2015, 02:11 PM   #5
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Vacuum pump??

Diesel or petrol engine?

Possible problem with the sucking jet pump/vacuum booster that feeds the power brake booster or a failing/failed diaphragm in power brake booster?

Cannot recall if the E46 had issues where the drain clogged up under the booster and some would fill with water??
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Old 01-09-2015, 04:07 PM   #6
huskyrossy1987
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Well the check valve is sucking fine I think as I did some tests,
When I pulled it out today , the brakes were solid
When I then pushed it back in to the booster , I had brake assist but not as how it used to be

When I pump the brakes repeatedly with the car running, the will go hard but then slowly regenerates vacuum to make the brakes spongy ish again but not to how it was before

Where do I listen for this sound? Ear by the booster isit?

Could it be the vacuum pump seals leaking?
I have looked into it on forums and oil can get inside or also the casing o ring me not be air tight, or even the valve on the vacuum pump ??
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Old 01-09-2015, 04:12 PM   #7
huskyrossy1987
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If the booster fails , can it fail completely or will it still work but only half pressure ?
I emptied the vacuum in the booster when the car was switched off, so brake pedal was solid and whilst pushing on it I started the car, which it dropped so I'm assuming the booster works?? What you guys think??
Much appreciated
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Old 01-09-2015, 04:27 PM   #8
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Booster can have a partial leak and still function, but have limited pedal applications and also cause the engine to run Lean and rough.

How may pedal applications can you get after the engine has been turned off for 15 minutes before the pedal goes hard?
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Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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Old 01-10-2015, 01:43 PM   #9
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Just done a test on that, it's been there for around 24 hours and I pumped it 3 times with the car not running, and another 2 times as it started losing pressure
So 5 in total

This seems to be fine then , I'm gonna take the vacuum pump off and put new seals in it with high temp gasket sealant

My idle on the revs isn't dead smooth either

Any other suggestions or do you think I'm on the right track?
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Old 01-10-2015, 01:45 PM   #10
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Also , is it normal on any car, that when the car is running, ( booster is working fine ). And you pump the brake several times, will the pedal go hard?
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Old 01-10-2015, 02:58 PM   #11
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Also is the photo of the vacuum pump has oil in it,
Is this normal or is that because it has leaked into it?
Just so I know for when I attempt it tomorrow
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Old 01-10-2015, 05:07 PM   #12
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So apparently you have a diesel. You should put that in your username information. Diesel E46s were not commonplace in the US. E46fans are predominantly US-based, as the site was started here. So people here are going to assume you are driving a petrol car, when you are not. the diesels are a different animal. Diesel engines have no intake vacuum, and have to use an external pump to generate the necessary vacuum for the brakes.

Get a vac pump rebuild kit if they're offered, and rebuild it. But you should still verify that the brake booster is 100%. If oil made it into the booster it's ruined.
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Old 01-10-2015, 07:01 PM   #13
huskyrossy1987
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Sorry didn't realise my information hadn't been updated
I've just done that now anyway

It is a 2.0 petrol. N42 engine
Same pump as in the photo I posted a few hours ago

Is oil meant to get into the pump?
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Old 01-10-2015, 07:28 PM   #14
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Weird. Gasoline engines are supposed to create their own intake vacuum as a matter of general operating principle. So now I am in the know about these BMW petrols that require an external vacuum source because of the Valvetronic system generating nearly no intake vacuum. This is the first time I have ever heard of a petrol engine requiring an external vacuum pump.

Apparently it is normal for oil to be present in the pump from the quick research I just performed.
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Old 01-10-2015, 07:42 PM   #15
huskyrossy1987
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Yeh I know
Valvetronic motors have these pumps
Well thank you for the research
I couldn't find this information myself
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Old 01-10-2015, 08:03 PM   #16
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Quote:
Originally Posted by huskyrossy1987 View Post
Just done a test on that, it's been there for around 24 hours and I pumped it 3 times with the car not running, and another 2 times as it started losing pressure
So 5 in total

This seems to be fine then , I'm gonna take the vacuum pump off and put new seals in it with high temp gasket sealant

My idle on the revs isn't dead smooth either

Any other suggestions or do you think I'm on the right track?
Sounds like the booster is not leaking if you got close to 5 pumps out of the brakes before they went hard with the car not running.
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Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 01-10-2015, 08:05 PM   #17
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Originally Posted by huskyrossy1987 View Post
Also is the photo of the vacuum pump has oil in it,
Is this normal or is that because it has leaked into it?
Just so I know for when I attempt it tomorrow
Oil and rubber do not get along.

It looks like this pump is driven from some part on the engine?? We do not have these in North America.

There is probably a seal that is leaking on the shaft for the pump and/or if the pump is driven off of something inside the crankcase, there may be a problem with the crankcase vent valve??

I would not expect to see oil inside this pump??
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 01-10-2015, 08:16 PM   #18
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According to this thread, it's normal for oil to be present in the pump for lubrication of the pump internals.

http://www.bmwforums.info/3-series-g...diy-guide.html
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Old 01-11-2015, 08:49 AM   #19
huskyrossy1987
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I've just taken it apart

I do have an oil leaking the o ring

Also the valve on the vacuum pump spins

Is this normal??
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Old 01-11-2015, 04:13 PM   #20
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According to the thread I cited, the oil is normal. From your pic it appears the seal between the two halves has perished. Read through that thread a little more. Can't tell you much more as I haven't much experience with it. However the UK BMW forums are your friend in this case, from my research there seems to be a lot of info from the UK on this.
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