| Changing front rotors if doing bearings? [message #351974] |
Wed, 05 February 2020 19:48  |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
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Are you guys changing rotors if pulling hubs or bearings? Im going to pull the hubs in the spring and repack/replace seals....
I know this is a subjective question as the rotor may still be in spec...currently i do not have vibration (well not when i parked it in the fall anyways...lol.) but can forsee possibly not the nicest rotor faces from sitting all winter though.
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: Changing front rotors if doing bearings? [message #351980 is a reply to message #351974] |
Wed, 05 February 2020 21:21  |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Rarely do I see anyone swap out rotors. Just make sure you always have good pads, and I think you will not last as long as our rotors will.
Rotors for gmc are also expensive
And hard to find.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: Changing front rotors if doing bearings? [message #351987 is a reply to message #351974] |
Thu, 06 February 2020 09:14 |
rjw
Messages: 697
Registered: September 2005
Karma: 4
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6cuda6 wrote on Wed, 05 February 2020 20:48Are you guys changing rotors if pulling hubs or bearings? Im going to pull the hubs in the spring and repack/replace seals....
I know this is a subjective question as the rotor may still be in spec...currently i do not have vibration (well not when i parked it in the fall anyways...lol.) but can forsee possibly not the nicest rotor faces from sitting all winter though.
The front rotors on my GMC were last replaced in 1991 (over 140,000 miles ago). They were touched up by Dave Lenzi a few years ago when I had him replace my bearings and drill holes for zerk fittings. Too bad the rotors on my cars don't last that long.
Richard
76 Palm Beach
SE Michigan
www.PalmBeachGMC.com
Roller Cam 455, TBI+EBL, 3.42 FD, 4 Bag, Macerator, Lenzi (brakes, vacuum system, front end stuff), Manny Tranny, vacuum step, Tankless + OEM water heaters.
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| Re: [GMCnet] Changing front rotors if doing bearings? [message #351988 is a reply to message #351984] |
Thu, 06 February 2020 09:29 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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They, (GMC) were not too concerned about that, as they had lathes, and
turned the whole shebang after assembly.
Where we run into issues with wobbly rotors is when we replace them,
and get high tolerance mixed with low tolerance pieces mated together. Like
Dave L. says, easy enough to fix if you have access to a good lathe.
Better is changing out linings before you get to metal on metal
contact.
The day I brought my coach home, I had just come from the tire shop
where I noticed as they were installing new tires that my pads were shot.
So, I drove the nose into the shop, and jacked it up, thinking that I
would throw a new set of pads on it that afternoon. Yeah, right!
Two months later, after I had rounded up all those very scarce (and
very expensive pieces) I had new rotors, hubs, knuckles wheel bearing sets,
upper and lower control arm bushings and ball joints, tie rod ends, and
sway bar links and bushings, along with a steering stabilizer and new KYB
shocks, Oh Yes! new semi metallic riveted brake linings. My coach sat
there in my open shop door, half in, and half out of the shop on jack
stands for almost 2 months. My bargain coach just to be a lot less of a
bargain, quick.
So, when you hear a squeal from the front end when you apply the brakes,
check stuff sooner than later.
Jim Hupy
Salem, Oregon
On Thu, Feb 6, 2020, 6:00 AM Matt Colie via Gmclist
wrote:
> lqqkatjon wrote on Wed, 05 February 2020 22:21
>> Rarely do I see anyone swap out rotors. Just make sure you always have
> good pads, and I think you will not last as long as our rotors will.
>>
>> Rotors for gmc are also expensive
>> And hard to find.
>
> And,
> There is another issue that Dave Lenzi has mentioned. The pads on the hub
> where the rotor secure are not square to the axis and often not very true.
> Anybody with a lathe can fix this real fast.
>
> 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
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| Re: Changing front rotors if doing bearings? [message #352003 is a reply to message #351974] |
Thu, 06 February 2020 18:34 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
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Senior Member |
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Thanks guys for the reply....the mechanic in me says "only tare into that stuff once if possible" as nothing would burnt my *ss more than to have to re/re that set up twice just to replace the rotors after.
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: Changing front rotors if doing bearings? [message #352012 is a reply to message #351974] |
Fri, 07 February 2020 07:20 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Lathe and a tool post grinder.... get them square and smooth all to once.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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