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Old Jun 19, 2014, 06:40 AM
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Spongy brake pedal
Hi,

I recently bought a 2005 Mitsubishi Lancer Ralliart 5speed Manual tansmission with 120k miles on it . The car had a poor braking. So the mechanic replaced the front brake pads and bled the system for any air in the system. The brake was good for around 30 miles, but late the pedal just sinks and is spongy. The mechanic is asking me to replace the Master brake cylinder. But I don't see any leaks anywhere. What might be the other causes for the issue ?
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Old Jun 19, 2014, 11:34 AM
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Has the fluid level gone down any amount ?
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Old Jun 19, 2014, 08:25 PM
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Originally Posted by 2006_RA
Has the fluid level gone down any amount ?
^sooo much this! lol
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Old Jun 20, 2014, 07:18 AM
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I'm not able to get the Master Brake cylinder!! Not available in US, it needs to be shipped from Japan might take 30 to 45 days to ship!!
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Old Jun 20, 2014, 07:53 AM
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Perhaps before buying parts you would check the fluid level daily and report it on the forum. Just to satisfy my curiosity you see, not really for any further diagnostic purposes.

Did you check Rock Auto for the master cylinder ?
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Old Jun 20, 2014, 09:55 AM
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Originally Posted by jag
I'm not able to get the Master Brake cylinder!! Not available in US, it needs to be shipped from Japan might take 30 to 45 days to ship!!

yeah, that's not true...I don't know where you got that information...
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Old Jun 20, 2014, 11:30 AM
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The brake system was bled twice and after a few miles , the brakes sink again.I noticed that there is a slight leak between cylinder and the booster. I called Rock Auto and the master cylinder is available. Thank you 2006_RA
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Old Jun 20, 2014, 06:52 PM
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a hydraulic system is one of the few that the smallest of leaks will cause a failure. it's not like oil, you can't simply top it up, because the ability of the fluid to resist compression is what makes it work. Even a small amount of air in the system will greatly reduce its performance.
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Old Jun 20, 2014, 07:19 PM
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Old Jun 20, 2014, 10:02 PM
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link is broken
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Old Jun 20, 2014, 10:15 PM
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https://www.flickr.com/photos/125583...n/photostream/
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Old Jun 20, 2014, 10:27 PM
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Does any one have the part number for the master cylinder?
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Old Jun 21, 2014, 04:57 AM
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Jag, you asked for the part number in this thread:
https://www.evolutionm.net/forums/04...t-numbers.html

Cranswick provided the part number 25 minutes after your post.
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Old Jun 21, 2014, 05:30 AM
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Which one is the better of the two?Centric or Dorman

Amazon.com: Dorman M630244 New Brake Master Cylinder: Automotive Amazon.com: Dorman M630244 New Brake Master Cylinder: Automotive

http://www.rockauto.com/catalog/more...888&cc=1431672
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Old Jun 21, 2014, 05:45 AM
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doesn't matter
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