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Brake question for 325i

 
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nelsonmay10



Joined: 17 Apr 2005
Posts: 115
Location: Charlotte, NC

PostPosted: Sat Mar 14, 2009 10:53 pm    Post subject: Brake question for 325i Reply with quote

I have a 6cly 1990 convertible and have a break pedal that depresses to the floor when the car starts. After a little driving the pedal has tension. Anyway, it started doing this and I changed the front brake pads. I left the top off the brake fluid reservoir and pressed the pedal lightly to make sure there was air in the reservoir. My ABS light also comes on.

Anyway, it is acting up again and this only happens when the car starts or has not been driven for a long period of time. (2-4 hours).

Before I go digging, could I have air in the lines, due to a crack? I don't see brake fluid leaking. Or should I look for something else?[/i]
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idanity



Joined: 21 May 2005
Posts: 3097
Location: N.W.U.S.A.

PostPosted: Sun Mar 15, 2009 1:41 am    Post subject: Reply with quote

definate air in the lines.

as fluid cannot compress, and air/ gas can compress.

the air in the system may get compressed enough to be squished in the line, and stay that way until the car shuts off, and releases its pressure build up.

sounds like a nice time for a full bleed
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beejay



Joined: 18 Nov 2002
Posts: 1158
Location: Eastern, Pa

PostPosted: Sun Mar 15, 2009 8:37 am    Post subject: Reply with quote

sounds more like the master cylinder is failing
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nelsonmay10



Joined: 17 Apr 2005
Posts: 115
Location: Charlotte, NC

PostPosted: Sun Mar 15, 2009 1:36 pm    Post subject: RE: Reply with quote

To make sure I have a full bleed correct, do I bleed one tire at a time while topping of fluid, or do I drain the system and start over with bleeding one tire at a time.
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85-325e



Joined: 30 Jun 2002
Posts: 4712
Location: Southampton, NY

PostPosted: Sun Mar 15, 2009 3:43 pm    Post subject: Reply with quote

Nelson... You start with the furthest wheel away... the rear passenger side... then do the rear driver's side, the the front passenger side and then the front driver, then the clutch slave if applicable (later models had a seperate line for the clutch slave).

You should probably use a different color fluid. Last time I did mine, I used the blue fluid and had gold in there before. The color differentiation lets you really know when the entire line is filled with new fluid.

You dont' drain the entire system. you do it as stated above, and new fluid will replace all the old fuild as you do it. Make sure you keep the reservoir topped up so you don't introduce air into the system. A pressure bleeder helps a lot of you're doing it alone.
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dale



Joined: 22 Aug 1999
Posts: 3087
Location: Seattle, WA USA

PostPosted: Sun Mar 15, 2009 6:38 pm    Post subject: Reply with quote

Some good reading prior to doing a brake bleed.

If the sponge feel doesn't go away, change the master cyl.

http://www.unofficialbmw.com/all/brakes/all_another_brake_fluid_change_procedure.html

http://www.unofficialbmw.com/all/brakes/all_brake_bleeding.html

this one if from some Dale guy in 1996! what an old fart
http://www.unofficialbmw.com/all/brakes/all_changing_brake_fluid.html

http://www.unofficialbmw.com/all/brakes/all_brake_fluid.html

Dale
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