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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Quick question brake fluids



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      11-18-2011, 02:05 PM   #1
Turbomcp
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Hi
i have a 2007 335i
i love the car, i bought it with very very low milage so its practicly new.
when i bought it it was still under warranty so i only needed to do reprogramming(gas pump and other recalls) and oil change.
now its out of warranty and i need to do the brake fluid and micro filter and bunch of shit they tell you in dealership(like plug it into the computer 75$ and other crap like standart scope 55$...)bottom line they wanted 450$+-
anyway i went to a mechanic my friend uses that does benz,bmw,porsche and he said he will do it for 150$ with original bmw parts.
he did the job and it seems fine and all.
but since i was there while he did it, i noticed that he didnt do it like in the online videos
he used a air pump to suck the oil out and then just put new brake oil in(original stuff and everything)
im just wondering is this the right way to do it? will it hurt my car?
does this bleeding/flushing thing a must or can it also be done the way he did it?


Thanks in advance

Last edited by Turbomcp; 11-18-2011 at 02:11 PM.
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      11-18-2011, 05:15 PM   #2
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Yes, that is fine

There are three ways:

Pressurize the system from the top and catch the fluid at the valves (by the calipers.)

Vacuum from the valves as your friend did.

Manually pump the brakes down open the valve to bleed the lines, close valve lift foot, repeat.
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      11-18-2011, 05:21 PM   #3
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Question

thanks
but what he did is vacum/suck it from the top(where you fill the oil,the tank)
is it still good?

Last edited by Turbomcp; 11-18-2011 at 05:35 PM.
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      11-18-2011, 10:01 PM   #4
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Quote:
Originally Posted by Turbomcp View Post
thanks
but what he did is vacum/suck it from the top(where you fill the oil,the tank)
is it still good?
That's how it's done from the factory. Less bubbles when you do it this way.
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      11-18-2011, 10:07 PM   #5
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your friend knows what he is doing.
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      11-19-2011, 06:42 AM   #6
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Thanks guys
its my first bmw and i am clueless except for what i saw online.
i wanted to make sure im paying less but getting same kind of service and not just paying less but going to guy that doesnt know whats going on
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      11-19-2011, 07:20 AM   #7
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OP, do you really write like this, or are you just lazy, or on a phone and the typing is a pain in the ass? Sorry to flame, but what you wrote is barely comprehensible and I’m just trying to help you. What I didn't get from what you wrote was if the mechanic actually bled the brake lines. It appears all he did was replace the brake fluid in the master cylinder reservoir.

If he just removed the brake fluid from the reservoir and replaced it, then he did not perform a proper brake flush. If the mechanic did not remove the wheels and flush the brake calipers by opening the bleeder valves with a wrench, he did not perform a complete brake flush. The fluid can be flushed by either using a vacuum extractor, or pressurizing the system at the brake fluid reservoir, or have someone pump the brake pedal, then opening each bleeder valve at the brake calipers individually until all the old fluid is removed from the system.
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      11-19-2011, 08:51 AM   #8
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Thanks for your reply
yes i was in a hurry,not on the phone and not lazy
sorry you got affended by my non mechanic expertise
i saw you are big english teacher in other posts too"Could you please rewrite this in standard English? It is really difficult to understand what you are asking." thats nice and handy to have around forums
but seriously,
thats what i thought, he didnt remove any wheels so he basicly sucked all oil out and replaced it with new.
so whats the difrence? is it hugh deal? are you suposed to flush every time?

Last edited by Turbomcp; 11-19-2011 at 09:12 AM.
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      11-19-2011, 10:21 AM   #9
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Quote:
Originally Posted by Turbomcp View Post
Thanks for your reply
yes i was in a hurry,not on the phone and not lazy
sorry you got affended by my non mechanic expertise
i saw you are big english teacher in other posts too"Could you please rewrite this in standard English? It is really difficult to understand what you are asking." thats nice and handy to have around forums
but seriously,
thats what i thought, he didnt remove any wheels so he basicly sucked all oil out and replaced it with new.
so whats the difrence? is it hugh deal? are you suposed to flush every time?
the difference is there is a small tube that runs from the brake matercylinder to the brake caliper at the wheel the small tube has brake fluid in it it needs to be replaced every so often the mechanic of your friend did not remove that brake fluid so it is still in there and needs to be removed and replaced with new stuff the mechanic of your friend did not know what he was doing
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      11-19-2011, 11:43 AM   #10
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thanks
i appreciate your reply
you think i should go do it in some other place?
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      11-19-2011, 01:01 PM   #11
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As Eninty stated, your brake lines are not flushed. This is necessary in cars like ours where ABS need to be kept in good condition without any corrosion byproducts floating around, so that both ABS and DSC can do their job. Please get those lines flushed.
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      11-19-2011, 09:20 PM   #12
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ill go to this guy monday
man im pissed, i would ask for my money back and never use this guy again
what an amature
anybody know of a trustworthy mechanic in usa-md-dc area?
Thanks for all the input everyone
much appreciated
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