| Brake work - caliper caution [message #349783] |
Fri, 01 November 2019 11:02  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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I have recently torn down a friends master cylinder to find it not damaged, but full of foreign material in the high pressure seals.
Because I am working to make a 95 Accord safe to drive again, I was watching YouTubes about front bearings. (The bearing has failed and so damaged one brake.)
In the section I was watching, the technician demonstrated that he always clamps off the line to the caliper and vents the fluid out the bleeder. As Greg's coach recently had front brake work and then the master cylinder failed (I mean failed big time - peddle to the floor, but no fluid lost!) I am willing to accept this as a cause.
When I come up for air, I plan to rebuild the good casting and put it on the shelf.
Matt - Break is over, back on my head
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: [GMCnet] Brake work - caliper caution [message #349784 is a reply to message #349783] |
Fri, 01 November 2019 11:08  |
Richard Denney
Messages: 920
Registered: April 2010
Karma: 9
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Senior Member |
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how Did the foreign material get in there? Doesn’t bench bleeding clear
such out of a fresh master cylinder? What does clamping the lines to the
wheels do?
Rick “not understanding” Denney
On Fri, Nov 1, 2019 at 12:03 PM Matt Colie via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I have recently torn down a friends master cylinder to find it not
> damaged, but full of foreign material in the high pressure seals.
>
> Because I am working to make a 95 Accord safe to drive again, I was
> watching YouTubes about front bearings. (The bearing has failed and so
> damaged
> one brake.)
>
> In the section I was watching, the technician demonstrated that he always
> clamps off the line to the caliper and vents the fluid out the bleeder. As
> Greg's coach recently had front brake work and then the master cylinder
> failed (I mean failed big time - peddle to the floor, but no fluid lost!) I
> am willing to accept this as a cause.
>
> When I come up for air, I plan to rebuild the good casting and put it on
> the shelf.
>
> Matt - Break is over, back on my head
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
'73 X-Glacier 230 "Jaws"
Northern Virginia
Offlist email: rick at rickdenney dot com
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| Re: [GMCnet] Brake work - caliper caution [message #349798 is a reply to message #349794] |
Fri, 01 November 2019 19:05 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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I don’t know how crud would go up into the master. Unless the system was
super contaminated and it was bled in reverse?
???
Sully
Bellevue wa
On Fri, Nov 1, 2019 at 2:53 PM Matt Colie via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I don't know where the stuff that fouled the master cylinder came from,
> but a caliper would not be any surprise. I plan to research this as a part
> of
> they brake job that is in process here. (If I can make the bearing come
> out of the knuckle.)
>
> Matt
>
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Brake work - caliper caution [message #349801 is a reply to message #349798] |
Fri, 01 November 2019 20:19 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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sgltrac wrote on Fri, 01 November 2019 20:05I don't know how crud would go up into the master. Unless the system was super contaminated and it was bled in reverse?
???
Sully
Sully,
Coaches tend to be way older than most passcars out there. So crud accumulating in a caliper is very possible.
And, yes, when you compress a caliper to replace the brake pads, you are reverse bleeding it. Albeit unintentionally so.
Greg's coach fits in the category of massively ignored for decades.
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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