| One-ton front caliper has been rubbing on disk [message #325756] |
Sat, 04 November 2017 13:29  |
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RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
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Senior Member |
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While flushing and bleeding my brakes, I broke the siezed front passenger bleeder off. I had kept all the part numbers from when I did the one-ton upgrade, so I got another Raybestos FRC4417 caliper. When I pulled the old caliper, I noticed the disk edge had been rubbing on the caliper. It touches at the last inch or so on each end of the caliper, there is plenty of clearance in the middle. The worse area is 0.038" deep.
Question is, should I grind out this area on the new caliper (would this weaken the caliper?). Or should I just let the new one wear in like the old one did?.
Posted some photos:
http://www.gmcmhphotos.com/photos/g7108-calipers-rubbing-on-disk.html
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
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| Re: [GMCnet] One-ton front caliper has been rubbing on disk [message #325757 is a reply to message #325756] |
Sat, 04 November 2017 14:20  |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Bruce,
Grind for clearance plus .020 and you should be just fine. 0.050 to .060 is not going to weaken the mount.
J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 30’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan
> On Nov 4, 2017, at 2:29 PM, Bruce Hislop wrote:
>
> While flushing and bleeding my brakes, I broke the siezed front passenger bleeder off. I had kept all the part numbers from when I did the one-ton
> upgrade, so I got another Raybestos FRC4417 caliper. When I pulled the old caliper, I noticed the disk edge had been rubbing on the caliper. It
> touches at the last inch or so on each end of the caliper, there is plenty of clearance in the middle. The worse area is 0.038" deep.
> Question is, should I grind out this area on the new caliper (would this weaken the caliper?). Or should I just let the new one wear in like the old
> one did?.
>
> Posted some photos:
> http://www.gmcmhphotos.com/photos/g7108-calipers-rubbing-on-disk.html
>
> --
> Bruce Hislop
> ON Canada
> 77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
> Hubler 1 ton front end
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
> My Staff says I never listen to them, or something like that
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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: One-ton front caliper has been rubbing on disk [message #325758 is a reply to message #325756] |
Sat, 04 November 2017 15:01 |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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Senior Member |
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If the new caliper rubs also, first check the wheel bearing play. Put the wheel back on to check it so you have enough leverage. Check the rotor diameter versus the brake pad wear area, maybe you have some extra metal there to get rid of, especially if it is aftermarket and not original GM stuff. I've had to clearance some calipers for aftermarket rotors before, and like J R said that 50 or 60 thousandths is not going to effect the strength of that iron casting.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: [GMCnet] One-ton front caliper has been rubbing on disk [message #325769 is a reply to message #325764] |
Sun, 05 November 2017 05:15 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Bruce,
Thanks for posting the 1-Ton brakes topic. I noticed a few thousand miles
ago that my pads were getting a little low. Hopefully your reminder will
cause a roundtuit to grow here soon. And I'll be sure to check for
interference too.
Ken H
On Sat, Nov 4, 2017 at 10:42 PM, Bruce Hislop wrote:
> Harry,
> I thought of doing that, but Murphy's law is always hot on my tail. I
> figured I'd get it all out of round too. I tried using the bench grinder
> on the
> caliper but I could not get it close enough inside. So I ended up putting
> the caliper in the vise and using a die grinder. The pain was getting the
> piston protected from the filings. It took a couple times testing it, but
> there is no rubbing now.
>
> I should also say that before I pulled the wheel, I gave it a few good
> vertical pulls to be sure the bearing was good.
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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