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Brake Issue

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gryffinwings View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gryffinwings Quote  Post ReplyReply Direct Link To This Post Topic: Brake Issue
    Posted: 18 Feb 2014 at 2:53pm
Hi, trying to diagnose my brake issue. here is what happens.

Brake power seems rather weak, when I press brake pedal further, wheels lock up.

Things done:
1. Tires Replaced
2. Front Soft Brake Lines Replaced
3. Full Brake Flush including compressing front brake calipers

Anybody know what's up, I don't think I have any air in my lines. Could this be a master cylinder? of even the brake booster?
1984 Nissan 720
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EzCruiser View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EzCruiser Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 2014 at 3:14pm
Can I assume that this is for your 84 720?
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gryffinwings View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gryffinwings Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 2014 at 3:59pm
Yes, it is.  I noticed as well that I have to double pump the brakes to make them work, but it doesn't fix the problem. Any ideas.

Yes this is for my 84 Nissan 720.
1984 Nissan 720
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MOCMAN View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MOCMAN Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 2014 at 10:00pm
Probably air in the lines but could also be the lack of adjustment on the rear brakes. Make sure you can hear the shoes just barely dragging on the drums.
John 3:16
"There's a fine line between "Hobby" and "Mental Illness"
1985 Nissan 720 KingCab 2wd 5spd.
1995 Nissan Hardbody 2wd Reg. Cab
2014 VW passat SEL VR6
1966 VW Beetle
2005 Ford Explorer XLT 4X4
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gryffinwings View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gryffinwings Quote  Post ReplyReply Direct Link To This Post Posted: 19 Feb 2014 at 10:03pm
I don't think it is air, but I've gotten information that it could be the adjusters for the rear drums, so I am going to take a look at those this weekend.
1984 Nissan 720
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EzCruiser View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EzCruiser Quote  Post ReplyReply Direct Link To This Post Posted: 20 Feb 2014 at 11:38pm
I would say that the brakes need adjusting.  My chevy pickup was doing that nearly exactly.  Turned out to be out of adjustment.  Turned the adjustment in until there was a light drag and it stopped!
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FLUX View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FLUX Quote  Post ReplyReply Direct Link To This Post Posted: 08 Apr 2014 at 8:22pm
Try pulling out the parking brake a couple clicks and see if the brake pedal gets any better. If it does then you know you need to adjust the rear shoes.
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ZacharyProhodsky View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ZacharyProhodsky Quote  Post ReplyReply Direct Link To This Post Posted: 08 Apr 2014 at 8:52pm
I had the same problem after replacing everything and found that you had to bleed the brakes a specfic way with that darn N.L.S.V. 
To properly bleed, and it takes a lot of fluid)
Bleed as follows.
1)Master Cylinder front
2)Master Cylinder Rear
3)N.L.S.V. front
4)front wheels
5)rear left(driverside) then rear right 
6)N.L.S.V. rear
7)N.L.S.V. center

The N.L.S.V. is located right under the passenger seat along the frame.

Hope this helps?

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MOCMAN View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MOCMAN Quote  Post ReplyReply Direct Link To This Post Posted: 09 Apr 2014 at 6:01pm
Forgive me but what is a N.L.S.V.?
John 3:16
"There's a fine line between "Hobby" and "Mental Illness"
1985 Nissan 720 KingCab 2wd 5spd.
1995 Nissan Hardbody 2wd Reg. Cab
2014 VW passat SEL VR6
1966 VW Beetle
2005 Ford Explorer XLT 4X4
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ZacharyProhodsky View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ZacharyProhodsky Quote  Post ReplyReply Direct Link To This Post Posted: 09 Apr 2014 at 6:06pm
Stands for 'Nissan load sensing valve' 
I think it controls the amount of brake fluid to each brake.
could be wrong?
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