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Old 10-02-2007, 09:05 PM
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BMW clutch issue

My co-worker has an '88 BMW 325i and one of the most stubborn clutch bleeding problems I've ever dealt with so far. He had the clutch master and slave replaced by a shop a year ago. Lost pressure completely a month ago. Thought it was the slave so he replaced it himself this time. Worked for about 2 weeks then gave out on him again. Thought might as well replace the master while its still under warranty. Did that and then it only lasted a few days. Tried bleeding it again about 3 times in a week and everytime it last about 1-2 trips and then loses pressure. Gains no pressure to slip it into gear what so ever.

Later we took a look at the sticker on the brake booster (because the clutch master and brake master rely on the same reservior for fluid) that says "Use only DOT 4 fluid." ***!! There was DOT 4 in the 80's? God almighty. The whole time he had this month long fiasco he had used DOT 3. We don't know what the mechanics used a year ago but it had been working fine all up until last month.

I brainstormed and thought, "why don't we set the car on 4 jackstands and then bleed it instead of the front left in the air only." (because this was in the parking lot of our store) So we bleed it again. We made sure it would hold pressure before we dared to drive back to his house. It made it home fine and he parked it in the garage. We decided to wait a weeks time and see if it still holds pressure. It didn't, of course.

SO, what you thinkin' there?

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Old 10-02-2007, 09:38 PM
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This is straight from Mitchell On-Demand:

HYDRAULIC SYSTEM BLEEDING
Ensure fluid reservoir remains full. Attach hose to bleed valve on slave cylinder. Submerge other end of hose in partially filled container of brake fluid.
Slowly pump clutch pedal several times. Hold pedal down on last stroke. Loosen bleed valve to allow air to escape. Close bleed valve and repeat until air is bled from system.
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Old 12-29-2007, 11:23 AM
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We did the correct bleeding procedure every time. He broke down and took it to a mechanic and he got the hoses from the dealer and tried it again. He drove it all the way to our store and once again it failed.

Do you think we should replace it with the original BMW master cylinder?
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