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      07-04-2022, 08:13 AM   #1
Jims M3
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Master Cylinder replacement

I took off my calipers to get them powdercoated and rebuilt after a couple of years of track use, I put them back on the car and started bleeding the brakes from rear to front. I use a pressure side bleeder on the cap, but then for the final bleed I usually do a two person method to get all the air out.

When I got to the front I saw that the powdercoater hadn't tighten the bleeders when he re-assembled the brakes and fluid was shooting out of the bleeders. I sealed them up cleaned up the mess and started over in the rear, the pedal is soft and after no air bubbles coming out, I can only assume that it wrecked the internal seal on the Master as the pedal will nearly sink to the floor, no leaks anywhere else.

So I ordered a new master cylinder, but I can't find any tutorial's on the F80 replacement. Does anybody have a link to a shop manual showing how this is done on this car? I just want to make sure I do it right.
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      07-04-2022, 02:10 PM   #2
knightarmor
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I don't know the answer to your question but if you pressure bled how were you able to build up pressure with bleed screws open??
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      07-04-2022, 03:05 PM   #3
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I doubt the master is ruined. If you run the system dry it just takes some work. You need to hook up the power bleeder and put 15psi on it and have friend help with a manual pedal bleed and probably need to do it with the car running. Also you can tap the caliper with a rubber mallet. You might have to do this a few times to get most of the air out.

Then you will to an ABS bleed with software.
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      07-04-2022, 03:14 PM   #4
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Quote:
Originally Posted by knightarmor View Post
I don't know the answer to your question but if you pressure bled how were you able to build up pressure with bleed screws open??
I closed them and re-bled everything twice now...I haven't tried with the car running though.
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      07-04-2022, 03:27 PM   #5
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Try it with the car running, On my E46 i had them off for a weeks when i had my BBK re done and it helped with the car running, but had to an ABS bleed also.

How much pedal do you have now? Also make sure there isn't any fluid around the pads, did the powder coater fully disassemble and rebuild? if not he could have ruined some piston seals in the oven.
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      07-04-2022, 04:24 PM   #6
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Quote:
Originally Posted by sly1types View Post
I doubt the master is ruined. If you run the system dry it just takes some work. You need to hook up the power bleeder and put 15psi on it and have friend help with a manual pedal bleed and probably need to do it with the car running. Also you can tap the caliper with a rubber mallet. You might have to do this a few times to get most of the air out.

Then you will to an ABS bleed with software.
Thanks so much this fixed it. 4th time bleeding it but it was the master that had the air in it. Hard pedal now....much appreciated!!
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      07-04-2022, 04:47 PM   #7
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You need ISTA and see video below. You have air and have to DSC bleed.

https://youtu.be/o7XsCMqZXw0
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