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Brake failiure. Master cylinder?

 
 
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mattsccm
Just got MTs


Joined: 21 Sep 2005
Odometer: 421




PostPosted: Mon Aug 14, 2017 9:14 am    Post subject: Brake failiure. Master cylinder? Reply with quote

Had a moment of excitement when I needed to stop quickly to miss a sheep. My foot went to the floor with the brake pedal and nowt happened. These brake have always been fine and only a few minutes before I was braking perfectly and hard down hill.
I cannot see any leaks from any of the pipework or brakes. Is it likely hat the master cylinder has failed?
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** GED **
Mud Obsessed


Joined: 18 Jun 2014
Odometer: 2039
Location: Scouser



PostPosted: Mon Aug 14, 2017 9:27 am    Post subject: Reply with quote

was it a one off or is it still doing it?
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the other co-founder of the DCJC

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Nightbar
Difflock Royalty


Joined: 30 Sep 2003
Odometer: 20799
Location: In a state of anticipation...


1999 Land Rover Defender

PostPosted: Mon Aug 14, 2017 9:50 am    Post subject: Reply with quote

Did the brake pedal firm up when pumped a few times?
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The ex-Difflock Ambassador to Naples, Sir Nightbar DCJC DFS and 2 bars.

Plant a tree for the Difflock 3
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mattsccm
Just got MTs


Joined: 21 Sep 2005
Odometer: 421




PostPosted: Mon Aug 14, 2017 10:04 am    Post subject: Reply with quote

Big SPAM nothing there. Can push the pedal down with a finger. and it doesn't pump up. When it happened the reservoir didn't lose any fluid but 48 hours later the level has dropped.
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Nightbar
Difflock Royalty


Joined: 30 Sep 2003
Odometer: 20799
Location: In a state of anticipation...


1999 Land Rover Defender

PostPosted: Mon Aug 14, 2017 10:27 am    Post subject: Reply with quote

Hmmm - if no obvious leak then I think that points to the master cylinder...

...mind you I had a similar failure a few years back and it was traced to a teeny weeny hole in a brake line which had let air into the system. Bleeding the brakes might sort out if there is air in the pipework which might rule that out if the problem continues.

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The ex-Difflock Ambassador to Naples, Sir Nightbar DCJC DFS and 2 bars.

Plant a tree for the Difflock 3
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mattsccm
Just got MTs


Joined: 21 Sep 2005
Odometer: 421




PostPosted: Mon Aug 14, 2017 10:31 am    Post subject: Reply with quote

Thanks. As far as I can tell the system is bone dry and I would expect a tiny hole to show at least a spec of moisture.
All I have to do know is work out which cylinder is needed. Every source tells me I have to chose from 2. Oh well.
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Nightbar
Difflock Royalty


Joined: 30 Sep 2003
Odometer: 20799
Location: In a state of anticipation...


1999 Land Rover Defender

PostPosted: Mon Aug 14, 2017 10:43 am    Post subject: Reply with quote

mattsccm wrote:
Thanks. As far as I can tell the system is bone dry and I would expect a tiny hole to show at least a spec of moisture.
All I have to do know is work out which cylinder is needed. Every source tells me I have to chose from 2. Oh well.


Sounds about right until someone comes along and corrects me Cool

Best of luck.

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The ex-Difflock Ambassador to Naples, Sir Nightbar DCJC DFS and 2 bars.

Plant a tree for the Difflock 3
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Scrunt44
Just got MTs


Joined: 11 Apr 2016
Odometer: 137
Location: Scotland.



PostPosted: Tue Aug 15, 2017 5:45 am    Post subject: Reply with quote

I take it is some kind of Land Rover, any chance of saying what vehicle it is that is being discussed?
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w3526602
Difflock Royalty


Joined: 10 Jun 2002
Odometer: 10758
Location: Glynneath, South Wales



PostPosted: Fri Sep 29, 2017 10:48 am    Post subject: Reply with quote

Hi,

if you have a garage, cover the floor with newspaper, park on top of it, let your truck drip overnight.

602

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Don't force it, use a bigger hammer, cos if it doesn't fit, the hammer is not big enough.
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