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threading brake slave cylinders

Posted by DougA

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threading brake slave cylinders #1
DougA Doug Anderson Kirkland, WA, USA 1965 MG MGB "Lady"	Posted: June 18, 2012 12:20AM Registered: 5 years ago Posts: 37

Hi folks,
I finally got a little time to start putting the rear breaks back together today and ran into a snag getting the slave cylinders to thread onto the nut on the brake line. I finally gave up and pulled the brake line to try and get it to thread while being able to move both pieces with no luck. Is there some trick I'm missing?

It's possible the threads on the nut are screwed up, if so, I need to get new lines, right?

Your thoughts appreciated.
D

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Re: threading brake slave cylinders #2
stuart sinclair honiton, United Kingdom 1979 MG MGB GT 1998 MG F "RITA"	Posted: June 18, 2012 03:11AM Registered: 1 year ago Posts: 618

The way i do them is to turn the brake line nut thing the wrong way until you feel it step down on the thred and the turn the right way, It's very easy to cross thred them,.

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Re: threading brake slave cylinders #3
rrmgb robert schau Reston, VA., USA 1973 MG MGB 1973 MG MGB	Posted: June 18, 2012 05:15AM Registered: 6 years ago Posts: 8,988

Yes it's possible the threads are messed up. Examine carefully.
Best to leave things loose but I think you did that when you took them off.
Also the fitting could have been overtightened many times and the flare is not seating.
A fine file all around the outer edge of the bubble will fix that problem.
RS

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Re: threading brake slave cylinders #4
twigworker Jack Austin Blowing Rock, NC, USA	Posted: June 18, 2012 06:58AM Registered: 7 years ago Posts: 20,766

X2 on Robert

In other words, when the line was inserted into the OLD cylinder and the fitting turned in tight, the flare at the end of the TUBE and the flare of the FITTING spread out, and although you were able to withdraw it/them they are not going to fit into the opening properly.

The fix though is simple. Use a flat file to stroke the business end edges of the tube flare and the spread out fitting. Do it with care and try to get a reasonably round profile.

When re-installing, push the tube down into the hole first and follow by screwing the fitting in while it has some level of play available.

Never, ever, start a hydraulic line with a wrench. It is really crucial that you make several revolutions BY FINGER before the wrench is applied, otherwise you are just asking to cross thread the thing and end up ruining one or both parts.

Jack

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Re: threading brake slave cylinders #5
ddubois Dave DuBois Bremerton, WA, USA	Posted: June 18, 2012 11:15AM Registered: 7 years ago Posts: 4,291

Jack - Thanks for the tip about filing the OD of the flair to get it into the cylinder. I have done that myself, but always wondered if that was a kosher procedure or if the final result would fail after time (guess that 20 years without a failure should tell me something).
Cheers,

Dave DuBois
1953 MGTD
1966 MGB
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