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School Me On Master Cylinders

 
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deermjd



Joined: 19 Jul 2010
Posts: 459
Location: Birmingham, Alabama

PostPosted: Fri Nov 01, 2013 3:59 am    Post subject: School Me On Master Cylinders Reply with quote

I will be installing a new master cylinder this weekend. Does anyone have experience replacing one on an R51 Pathfinder? Or any tips in general for installing a master cylinder? I have experience replacing brake pads, rotors, and calipers. I have flared and bent hard brake lines. I have worked on just about every other part of the brake system so I guess it's time to learn about master cylinders. I've looked at the service manual and it seems pretty straightforward. Any suggestions?
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05 SE 2wd

Bilstein shocks/struts, K&N air filter, transmission cooler bypassed
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Joined: 13 Aug 2008
Posts: 2684
Location: Winnipeg, Canada

PostPosted: Fri Nov 01, 2013 5:52 am    Post subject: Reply with quote

is it actually leaking? Or just a spongy brake pedal?

Pretty sure its a simple install. The trick is getting all the air out during the bleeding process.

t
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Terry in Winnipeg

'05 Pathfinder SE Premium 4x4 - 315000kms (195000mi) - weekend warrior, Cortex Superchips on 87 Octane Tune, K&N filtercharger, Airlift 1000, Prodigy Brake controller, 7 pin trailer hookup, Prostart Remote Starter, Bilstein 4600 rear shocks, Cooper Discoverer ATw P265/70/16
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deermjd



Joined: 19 Jul 2010
Posts: 459
Location: Birmingham, Alabama

PostPosted: Fri Nov 01, 2013 6:33 am    Post subject: Reply with quote

Spongy brake pedal. Bleeding the brakes didn't seem to help so the master cylinder appears to be the culprit.
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05 SE 2wd

Bilstein shocks/struts, K&N air filter, transmission cooler bypassed
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Location: Winnipeg, Canada

PostPosted: Fri Nov 01, 2013 10:06 am    Post subject: Reply with quote

Have a read on this post:

http://www.thenissanpath.com/viewtopic.php?t=7749

I know its different symptoms, but might be worth looking at.
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Terry in Winnipeg

'05 Pathfinder SE Premium 4x4 - 315000kms (195000mi) - weekend warrior, Cortex Superchips on 87 Octane Tune, K&N filtercharger, Airlift 1000, Prodigy Brake controller, 7 pin trailer hookup, Prostart Remote Starter, Bilstein 4600 rear shocks, Cooper Discoverer ATw P265/70/16
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deermjd



Joined: 19 Jul 2010
Posts: 459
Location: Birmingham, Alabama

PostPosted: Sat Nov 02, 2013 2:13 pm    Post subject: Reply with quote

Thanks. That's good to know for future reference.

I installed the new master cylinder this morning. The brakes feel much stronger and more responsive. however there is air in the brake lines that I have not been able to get out. I bench bled the new master cylinder and bled the line fittings on it after it was installed. I then bled all 4 calipers with no improvement. I have a couple of ideas. The brake lines going from the master cylinder to the ABS module are higher than the master cylinder and is the highest point in the system. Is it possible that air could be trapped here? Also do I need a special scan tool to allow the ABS system to be bled? The service manual does not mention that such a tool is needed.
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05 SE 2wd

Bilstein shocks/struts, K&N air filter, transmission cooler bypassed
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deermjd



Joined: 19 Jul 2010
Posts: 459
Location: Birmingham, Alabama

PostPosted: Sun Nov 03, 2013 5:58 pm    Post subject: Reply with quote

Some pictures from replacing the master cylinder. Replacing the master cylinder itself is a stupid easy job. It's only two bolts. The tricky part comes in bench bleeding the new master cylinder and bleeding air from the brake system after installation. I referenced the service manual during the job but found it to be a bit lacking for the typical shade tree mechanic.

Removal: Disconnect negative battery cable and remove brake fluid pressure and level sensors. Remove brake lines from master cylinder and remove master cylinder from brake booster. Here's where I deviated from the service manual. The manual says to open bleeder valves at each brake caliper and drain brake fluid. I did not. My intent was to avoid bleeding each wheel cylinder if at all possible.

[URL=http://s947.photobucket.com/user/deermjd/media/P1010124_zps35eb4815.jpg.html]

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Close up shot
[URL=http://s947.photobucket.com/user/deermjd/media/P1010126_zpsc5ec9746.jpg.html]

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Master cylinder removed
[URL=http://s947.photobucket.com/user/deermjd/media/P1010130_zpsc26f2c7c.jpg.html]

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Bench bleeding. There are numerous tutorials on this and the new master cylinder should come with instructions so I won't go into detail on this. It can be a bit messy so be prepared.

[URL=http://s947.photobucket.com/user/deermjd/media/P1010132_zps94158fcc.jpg.html]

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New master cylinder installed.

[URL=http://s947.photobucket.com/user/deermjd/media/P1010134_zps23057f3a.jpg.html]

[/URL]
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Bilstein shocks/struts, K&N air filter, transmission cooler bypassed
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