Is This the Master Cylinder?
Thread Starter
Melting Slicks
Joined: Jun 2004
Posts: 3,253
Likes: 2
From: Castro Valley CA
Is This the Master Cylinder? Part 2
A couple facts first:
Original 1994 Master Cylinder
C5 Front Brakes
Well Bled system
No external Leaks
No idiot lights on dash indicating a brake problem
On first push, pedal sinks to the floor, I can pump it up and then get a firm pedal that does not sink to the floor. This is all stationary in the garage with or without the engine on. I have not driven it in this condition.
Original 1994 Master Cylinder
C5 Front Brakes
Well Bled system
No external Leaks
No idiot lights on dash indicating a brake problem
On first push, pedal sinks to the floor, I can pump it up and then get a firm pedal that does not sink to the floor. This is all stationary in the garage with or without the engine on. I have not driven it in this condition.
Last edited by Sidney004; Nov 5, 2011 at 12:50 AM.
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
Thread Starter
Melting Slicks
Joined: Jun 2004
Posts: 3,253
Likes: 2
From: Castro Valley CA
The air in the lines and the need for bleeding does not make a whole lot of sense for me. The car is basically a race car with speedbleeders on every corner. As I said in the original post, the brakes were freshly bled; there is no air in the lines. I bleed the brakes after every event. Thanks for the feedback though.
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Le Mans Master
Joined: Aug 2010
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if you still have the abs working , reverse pressure bleed from the rears to and thru the abs. something else you can do is to pull the abs fuse and see if it duplicates the issue
Last edited by oldalaskaman; Oct 16, 2011 at 11:01 PM.
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Thread Starter
Melting Slicks
Joined: Jun 2004
Posts: 3,253
Likes: 2
From: Castro Valley CA
Okay an update. Changed master cylinder, bench bled master cylinder with cardone syringe tool, bled all calipers(I have speedbleeders) and after all that; basically same deal pedal sinks on first push(maybe not as bad as before) and will be normal after you pump it up. Removed the ABS fuse(behind battery) and no difference. Oh yeah, to top it off the alternator stopped charging in the middle of all this
What do you think I should try next; is there any way to positively eliminate the ABS as a possible source of an internal leak. Its beginning to look like my track events are over until next year unless I can get this solved. Thanks for everyone's help.
What do you think I should try next; is there any way to positively eliminate the ABS as a possible source of an internal leak. Its beginning to look like my track events are over until next year unless I can get this solved. Thanks for everyone's help.
Thread Starter
Melting Slicks
Joined: Jun 2004
Posts: 3,253
Likes: 2
From: Castro Valley CA
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
However the only thing that comes to mind is if the master had some trapped air in it (or in a connecting line close by), and possibly back bleeding it pushed the air thru the master and out.
