Master cylinder
Elder User
Joined: Nov 1999
Posts: 796
Likes: 3
From: Anderson Northern Ca
Brake fluid leak
rdweathers,the only thing I can think is that the cover was not aligned right and left a small gap for the fluid to escape from or possibly a small piece of dirt or grit between the seal and the master cylinder allowing a small amount of fluid to leak out when you brake.You did not say how much fluid you were losing and the time it took to lose it.That's all I got.
"bowties in the rearview mirror"
"bowties in the rearview mirror"
Thread Starter
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Senior User
Joined: May 2010
Posts: 223
Likes: 0
From: Florida
It is a small amount. It did the same thing before i replaced the master cylinder, but a lot more. I have also replaced the front calipers and flexible brake hoses. I need to get the rotors turned due to when braking hard there is a grab-release feeling, would this pulsating when braking cause this? I do not feel the pedal moving back and forth when braking.
Fleet Mechanic
Joined: Feb 2007
Posts: 1,326
Likes: 48
From: Middle TN
I have noticed that lately the cast iron rim on most master cylinders for our trucks seem to be really rough. Years ago I don't remember them being this rough. The last two I have bought, I turned them on it's side, clamped in a vise and filed the rim until it was semi-smooth and made a good seal with the rubber gasket before I installed it. It needs a good seal or it can absorb moisture.
