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Front calipers...again [message #277145]

Sat, 02 May 2015 15:52

Harry

Messages: 1888
Registered: October 2007
Location: Victoria, BC CANADA

Karma: 3

Senior Member

I ordered front calipers #18 4081, 18 4082 as 80mm.
They do not look like any of the pictures I have seen of 80mm calipers.
There is no bump to grind off.
The piston measures 72mm outside.
The bleeder is in a different position from the 80mm.
What do I have?

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Re: Front calipers...again [message #277148 is a reply to message #277145]

Sat, 02 May 2015 17:18

wally

Messages: 643
Registered: August 2004
Location: Omaha Nebraska

Karma: 5

Senior Member

Harry wrote on Sat, 02 May 2015 15:52

I ordered front calipers #18 4081, 18 4082 as 80mm.
They do not look like any of the pictures I have seen of 80mm calipers.
There is no bump to grind off.
The piston measures 72mm outside.
The bleeder is in a different position from the 80mm.
What do I have?

You have calipers like our original fronts.
You might get 18-4122 right and 18-4123 left. These are listed as 1984 Chevy C20 with JB7 brakes and 3-5/32" pistons.
HTH

Wally Anderson
Omaha NE
75 Glenbrook

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Re: Front calipers...again [message #277149 is a reply to message #277148]

Sat, 02 May 2015 17:38

Harry

Messages: 1888
Registered: October 2007
Location: Victoria, BC CANADA

Karma: 3

Senior Member

Thank you for that.
Hopefully I can take these back.

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Re: [GMCnet] Front calipers...again [message #277185 is a reply to message #277145]

Sun, 03 May 2015 17:55

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma: 6

Senior Member

David,

Photos would be worth a 1000+ words! :-)

Regards,
Rob M.

-----Original Message-----
From: David H. Jarvis

I ordered front calipers #18 4081, 18 4082 as 80mm.
They do not look like any of the pictures I have seen of 80mm calipers.
There is no bump to grind off.
The piston measures 72mm outside.
The bleeder is in a different position from the 80mm.
What do I have?

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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Re: [GMCnet] Front calipers...again [message #277234 is a reply to message #277149]

Mon, 04 May 2015 08:25

powerjon

Messages: 2446
Registered: January 2004

Karma: 5

Senior Member

David and all,

I have uploaded the Parts list for Disk Brake conversion for the coach, the numbers are pretty current. It show the parts needed for the 80 MM front and the rear Cad conversion.

http://www.gmcmhphotos.com/photos/general-pictures/p57922-disk-brake-conversion.html
http://www.gmcmhphotos.com/photos/general-pictures/p57924-disk-brake-conversion.html
http://www.gmcmhphotos.com/photos/general-pictures/p57926-disk-brake-conversion.html

And for those of you that missed the original post of several weeks ago here is how to install the 80MM fronts.

http://www.gmcmotorhome.com/commodore/front_brake/index.html

JR Wright
GMC Great Laker MHC
GMC Eastern States
GMCGL Tech Editor
GMCMHI
78 GMC Buskirk 30’ Stretch
1975 GMC Avion
Michigan

> On May 2, 2015, at 6:38 PM, David H. Jarvis wrote:
>
> Thank you for that.
> Hopefully I can take these back.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan

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Re: [GMCnet] Front calipers...again [message #277240 is a reply to message #277234]

Mon, 04 May 2015 10:35

Harry

Messages: 1888
Registered: October 2007
Location: Victoria, BC CANADA

Karma: 3

Senior Member

Hello Rob;
I sent a picture to you.
DJ

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Re: Front calipers...again [message #277245 is a reply to message #277145]

Mon, 04 May 2015 11:21

Tony Cook

Messages: 121
Registered: August 2014
Location: Torrance CA

Karma: 0

Senior Member

Just finished my conversion on the fronts yesterday along with the process of replacing all existing old steel lines with SS. The mod was fairly easy i think the hardest parts is bending the flex hose fitting at the caliper/Banjo connection to clear ball joint. One thing i am having an issue with are the hose's hitting the steering linkage it's not bad but i dont like the fact that the hoses rub when steering. I used the original mounting locations on the frame but not on the ball joints just didn't seem to work with the newer style hoses .Any ideas as to mounting the hoses differintly . Thanks Tony

Tony Cook 77' Kingsley ' SuperSession 77 ' Torrance Beach,CA

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Re: Front calipers...again [message #277282 is a reply to message #277245]

Mon, 04 May 2015 21:08

wally

Messages: 643
Registered: August 2004
Location: Omaha Nebraska

Karma: 5

Senior Member

Tony Cook wrote on Mon, 04 May 2015 11:21

Just finished my conversion on the fronts yesterday along with the process of replacing all existing old steel lines with SS. The mod was fairly easy i think the hardest parts is bending the flex hose fitting at the caliper/Banjo connection to clear ball joint. One thing i am having an issue with are the hose's hitting the steering linkage it's not bad but i dont like the fact that the hoses rub when steering. I used the original mounting locations on the frame but not on the ball joints just didn't seem to work with the newer style hoses .Any ideas as to mounting the hoses differintly . Thanks Tony

Tony, I hear ya on hose and steering. This is what others did, I did the same but no pics. Short version is an additional support on the upper a arm keeps the hose up off the tie rods.
http://www.gmcmhphotos.com/photos/disc-brakes-2fchuck-aulgur-reaction-arm-install/p40168-right-front.html
http://www.gmcmhphotos.com/photos/member-galleries/p39698-80-mm-front-hose.html
http://www.gmcmhphotos.com/photos/disc-brakes-2fchuck-aulgur-reaction-arm-install/p40164-left-front.html

HTH

Wally Anderson
Omaha NE
75 Glenbrook

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Re: Front calipers...again [message #277292 is a reply to message #277145]

Mon, 04 May 2015 21:54

Tony Cook

Messages: 121
Registered: August 2014
Location: Torrance CA

Karma: 0

Senior Member

Cool that's what I was planning on doing as well mounting to the A arms . Thanks !

Tony Cook 77' Kingsley ' SuperSession 77 ' Torrance Beach,CA

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