Even after doing some research and reading the bently, I just want to double check what the symptoms of a bad master cylinder are. I've replaced the calipers, pads and rotors all around, and I've bled the brakes probably 4 times now with a pressure bleeder. Every time I quickly stomp on the pedal the brakes immediately grab, but every time I slowly and gradually apply the brakes the pedal goes to the floor. If I slowly press the brakes but then stomp on the pedal then the brakes instantly grab. I'm like 95% sure I've bled the brakes correctly, only pumping to about 12psi, along with working the brake pedal, and there's no leaks.
Announcement
Collapse
No announcement yet.
Symptoms of bad master cylinder
Collapse
X
-
Sounds like a bad master cylinder. Pumping builds pressure but holding it down and having it slowly go to the floor means it's losing pressure when it shouldn't. Had one do this and found it was leaking inside the brake booster. It wouldn't put this off as brakes are kinda important."I'd probably take the E30 M3 in this case just because I love that little car, and how tanky that inline 6 is." - thecj
85 323i M TECH 1 S52 - ALPINEWEISS/SCHWARZE
88 M3 - LACHSSILBER/SCHWARZE
89 M3 - ALPINEWEISS II/M TECH CLOTH-ALCANTARA
91 M TECHNIC CABRIO TURBO - MACAOBLAU/M TECH CLOTH-LEATHER
-
It does sound like a master cylinder. If it's also leaking In to the booster you will need to replace that too since brake fluid will break down the diaphragm in the boosterSeat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com
https://www.r3vlimited.com/board/sho...86#post4944786
Alice the Time Capsule
http://www.r3vlimited.com/board/showthread.php?t=360504
87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220
Comment
-
Originally posted by E30 Wagen View PostIt's possible to replace a master cylinder using a pressure bleeder, right? Or do I have to do that bench bleeding procedure?Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com
https://www.r3vlimited.com/board/sho...86#post4944786
Alice the Time Capsule
http://www.r3vlimited.com/board/showthread.php?t=360504
87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220
Comment
Comment