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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Fri, Dec-23-2016, 03:21:39 AM   #1
Jimitasse
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Unhappy Clutch Pedal Occasionally Looses Pressure (stuck on the floor)

Good afternoon everyone,

My E36 M3's clutch pedal occasionally drops to the floor and looses most of it's pressure. I would say the clutch pedal gets very soft as well. It eventually comes back and has pressure after giving it some time.

What has been done to the car recently:

I've changed the Clutch Master Cylinder, the Clutch Slave Cylinder, had a mechanic do a clutch job on the car (new clutch, flywheel, and pressure plate resurfaced), & bled the car myself with a BavAuto pressure bleeder.

& the car continued to had this intermittent issue.

So i decided to leave my car at a BMW "specialized" shop and had them look it over. I also had them look at the Slave & Master Cylinders to see if I had installed them properly. He also told me there were no leaks on the lines.

The service advisor called me the next day to tell me that when they had bled the clutch & the brakes, there were ZERO air bubbles in the system & that I had installed the Cylinders properly. He also told me that they drove the car for miles and couldn't replicate the issue...

A few days later, I ran into this problem again .

Hoping to get some suggestions before I take my car into a job just for them to tell me they couldn't find the problem...

Thanks in advance!
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Old Fri, Dec-23-2016, 04:54:05 AM   #2
Braymond141
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Default Re: Clutch Pedal Occasionally Looses Pressure (stuck on the floor)

Clutch Master. Replace it again.
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Old Fri, Dec-23-2016, 06:03:57 PM   #3
unimpressed
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Default Re: Clutch Pedal Occasionally Looses Pressure (stuck on the floor)

I have a similar issue where my clutch pedal will occasionally stick to the floor. Keeping the reservoir over the full line has alleviated it 90% of the time, but I don't have a permanent fix.

Interested if another clutch master cylinder will fix your problem.
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Old Fri, Dec-23-2016, 10:18:54 PM   #4
Jimitasse
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Default Re: Clutch Pedal Occasionally Looses Pressure (stuck on the floor)

Going to try that again & keep you posted.

The mechanic told me that the Master that I had put in wasn't leaking but perhaps it's messed up internally.
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Old Fri, Dec-23-2016, 11:19:04 PM   #5
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Default Re: Clutch Pedal Occasionally Looses Pressure (stuck on the floor)

Quote:
Originally Posted by Jimitasse View Post
Going to try that again & keep you posted.

The mechanic told me that the Master that I had put in wasn't leaking but perhaps it's messed up internally.
External leaks are not the sole indication of functionality.
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Old Sat, Dec-24-2016, 03:44:17 PM   #6
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Default Re: Clutch Pedal Occasionally Looses Pressure (stuck on the floor)

This happened to be when I tried to bleed slave cylinder without taking it off the bellhousing. I believe some of the air inside the system is causing the pedal to stick to the floor because there is not enough hydraulic pressure to resist spring force that is attached the clutch pedal.

Use the correct bleeding method:
1. Move clutch pedal up and down 10 times then put it back to the normal resting ( in the air) position.

2. Go down to the bellhousing and remove the clutch slave cylinder.

3. Press the rod and while pressing it firmly, loosen the bleeder screw with 7mm spanner.

4. Have the air come out, and tighten the bleeder screw WHILE holding the rod tight.

5. After you've tightened the bleeder screw, let go of the rod and put it back to the bellhousing.

Repeat procedure 1-5 as needed.

No more pedal sticking to the floor after I've done this. Traditional brake bleeding method DOES NOT work with clutch bleeding. I only had to do this 5 times because I already had some hydraulic pressure in the clutch line.
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Discussing Clutch Pedal Occasionally Looses Pressure (stuck on the floor) in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)