Unofficialbmw.com Forum Index Unofficialbmw.com
The UnofficialBMW BB, answers for your BMW questions.
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

master cylinder bleeding and bleed procedure-e12

 
Post new topic   Reply to topic    Unofficialbmw.com Forum Index -> 5 Series Forum

Support Unofficialbmw.com :: Download Free Healthy Habits iPhone app!

View previous topic :: View next topic  
Author Message
edjack



Joined: 04 Feb 2002
Posts: 3887
Location: San Jose, CA

PostPosted: Mon Aug 20, 2001 9:15 am    Post subject: master cylinder bleeding and bleed procedure-e12 Reply with quote

If you have not replaced the master cyliner, and it is full of fluid, you do not need to specifically bleed it. If you did replace it, you'll need to bleed it at the bleed screws, one at a time. If you use the brake pedal to pump the fluid, you need to open the screw, depress the pedal, and close the screw. Then slowly release the brake pedal in about 3-5 seconds time.

You would keep doing this until fresh fluid comes out. You would use a hose and a clear bottle to catch the fluid to observe this.


There is a downside to this method: if there is a ridge worn into the wall of the master cylinder, due to normal operation, the movement of the seals past this ridge will damage them. Note that the master cylinder will be stroking all the way to "bottom", which does not happen in normal operation.

However, I have never personally had this happen to me.

During this procedure, keep the master cylinder full of fluid. (I recommend Castrol LMA.) If it runs dry, you'll have to begin all over again.

Before you begin, use a turkey baster to suck out all the old fluid from the reservoir.

Begin at the right rear wheel, do the same as above, then the left rear, then the right front, then the left front.

Don't forget the clutch circuit.

NOTE: Brake fluid can ruin the paint. If spilled on paint, wipe and wash immediately.

I urge you to buy the Chilton and Haynes books for your car. Haynes sells one for the 530/528, ISBN 0 85696 632 0. Distributed in the USA by Haynes, 861 Lawrence Dr, Newbury Park, CA.

The Chilton book, ISBN 0 8019 7941 2, covers all BMW models from 1970-88. Chilton is in Radnor, PA.

Both will give you more details on bleeding than I have room for here, and if you've never bled a brake system, you'll need plenty of good info to do it correctly.
Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic   Reply to topic    Unofficialbmw.com Forum Index -> 5 Series Forum All times are GMT - 5 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Powered by phpBB © 2001, 2005 phpBB Group