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#1
10-28-2025, 08:13 PM
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Do you have an infrared thermometer?
Weird flow at the caliper might lead to stuck caliper but if just one you will feel it in the wheel it will pull to the side that sticks but also that will get very hot! You should try driving with the booster disconnected obviously with every needed precaution it will take a lot of force to engage the brakes but it should stop locking up. Or: loosen the two nuts holding the MC and that should confirm if the booster rod is the issue. The front left caliper I would consider that part B. Have you done any of the diagnostic steps to test the booster yet? –awr– Using Tapatalk VIP on iPhone
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) 
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#2
10-29-2025, 12:01 AM
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Yes you would not notice the difference in length unless you used a digital caliper.
–awr– Using Tapatalk VIP on iPhone
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2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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#3
10-29-2025, 06:24 AM
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@E70Jane, What happened to the brake fluid being restricted to front driver's side ??
It might be less confusing if you stick to your original thread.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) Last edited by 80stech; 10-29-2025 at 06:33 AM.
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#4
10-29-2025, 09:23 AM
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I've never seem a BMW with a adjustable MC push rod. Some have a rod length adjustment on the brake pedal side of the booster.
Need to be careful that shimming MC doesn't create a vacuum leak. When the problem occurs, have you tried lifting the brake pedal with your foot to see if brake pressure is released? Is the brake pedal return spring disconnected? Is something interfering with the brake pedal returning fully?
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'21 X5, '15 435i, '10 535i, '08 X5, '98 M3/4
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#5
10-29-2025, 10:20 AM
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I think this another one of those threads getting posted in multiple places/forums and everyone is getting a different piece of the story.
Plus probably some private messaging and Andrew Wynn adding to the confusion.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) Last edited by 80stech; 10-29-2025 at 10:51 AM.
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#6
10-29-2025, 10:24 AM
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No brake pressure on front circuit after master cylinder replacement
Correct.
Regarding [mention]e70jane [/mention]topic of the automatic brakes go here: https://r.tapatalk.com/shareLink/top...ink_source=app –awr– Using Tapatalk VIP on iPhone
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2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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#7
10-29-2025, 01:23 PM
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Quote:
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#8
10-29-2025, 02:04 PM
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It happens all the time when people just reply to the thread last posted. I was just as guilty not checking the thread title.
–awr– Using Tapatalk VIP on iPhone
__________________
2011 E70 • N55 (me) 2012 E70 • N63 (wife)
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