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Bad Brand New Master Cylinder


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Philn1's Avatar
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May 27th, 2012, 11:13 AM   #1  
Bad Brand New Master Cylinder

2003 Malibu.
Brake pedal going all the way down to floor so thought I would start with replacing the master cylinder.
Bench bleeding the new one (a "new" Fenco from Autozone) the following happens:
When pushing the rod in, forward port immediately pushes fluid through.
Rear port does not send any fluid through until rod is almost at the end of it's travel.
Thinking there may be a lot of air the rear port, I repeated pushing in the rod 10 times with the same results
This looks like a bad master cylinder to me.
Any opinions?

thanks

 
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May 28th, 2012, 5:42 AM   #2  
Bad Brand New Master Cylinder

I had the same problem and found that fluid was leak from the brake caliper. I changed the caliper and problem solved. Have you replaced the brake booster?

 
Philn1's Avatar
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May 28th, 2012, 6:11 AM   #3  
I am not losing any fluid so no leaks at the calipers.
Have not replaced brake booster.
Thought I would start with the master cylinder.

 
oldchevy's Avatar
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May 28th, 2012, 9:36 AM   #4  
Are you using the correct bench bleeding technique?

 
kevinkpk's Avatar
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May 31st, 2012, 2:43 PM   #5  
Posted By: Philn1 2003 Malibu.
Brake pedal going all the way down to floor so thought I would start with replacing the master cylinder.
Bench bleeding the new one (a "new" Fenco from Autozone) the following happens:
When pushing the rod in, forward port immediately pushes fluid through.
Rear port does not send any fluid through until rod is almost at the end of it's travel.
Thinking there may be a lot of air the rear port, I repeated pushing in the rod 10 times with the same results
This looks like a bad master cylinder to me.
Any opinions?

thanks
Take it bake to AZ, and explain it to them, becuase it's new dosen't mean squat.

 
Philn1's Avatar
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May 31st, 2012, 4:09 PM   #6  
Took it Back

I am using correct bleed procedure.
Got a replacement from Napa. Bled fine.
Thanks,

 
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