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Home » Public Forums » GMCnet » Brake Master Cylinder replacement (brake lines seized to fittings)
Brake Master Cylinder replacement [message #352875] Wed, 18 March 2020 10:17 Go to next message
Green machine is currently offline  Green machine   Canada
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Registered: July 2019
Location: North Vancouver BC
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As the title suggests I am replacing my BMC. The bolts holding it on to the booster were a pain the @&% but with the usual combination of penetrating oil, hitting with a punch, heating, tightening and loosening, I finally freed them up.

Now I have the brake line fittings freed up from the BMC, but of course the lines are twisting with the fittings. Ive given the same treatment as above to no avail. My thought was to cut them off and reflare the lines in place as there should be plenty of room with the BMC removed. There is extra line due to the coiling beside the BMC that I'm confident i could manipulate to free up the extra inch or so i would need. Any advice or thoughts on this before I proceed with my plan?

Thanks and stay safe out there.

Shawn Harris North Vancouver, Canada 1977 Palm Beach 403

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Re: Brake Master Cylinder replacement [message #352882 is a reply to message #352875] Wed, 18 March 2020 13:01 Go to previous messageGo to next message
Matt Colie is currently offline  Matt Colie   United States
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Registered: March 2007
Location: S.E. Michigan
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Shawn,

If you can get an hot flame right on the nut and then cool it with AFT, you have a good change that the line will come loose. When you do this operation, be aware that if representative from First People show up, you can just tell them that you didn't know what it said......

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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Re: Brake Master Cylinder replacement [message #352885 is a reply to message #352875] Wed, 18 March 2020 13:36 Go to previous messageGo to next message
6cuda6 is currently offline  6cuda6   Canada
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As Matt suggested...

Rich Mondor, Brockville, ON 77 Hughes 2600

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Re: Brake Master Cylinder replacement [message #352891 is a reply to message #352875] Wed, 18 March 2020 15:54 Go to previous message
Green machine is currently offline  Green machine   Canada
Messages: 184
Registered: July 2019
Location: North Vancouver BC
Karma: 5
Senior Member
Thanks guys. I was too impatient to wait for a response so i just cut it off...anyway. All is well, flared the line, reshaped it a bit and all is well. No leaks.

Word to the wise....after you bleed the brakes don't test the pedal with out drums on the brakes... Confused

Shawn Harris North Vancouver, Canada 1977 Palm Beach 403

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