Replacing front brake rotor - removing bearings?

A

armand minnie

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The maintenance manual says to remove and repack the OEM front bearing as part of replacing the rotor and I am trying to understand why. I think it is
because you have the opportunity. But, I have the zerk fittings on my hubs and shoot some grease in there annually with the axle bolts loosened -
repacking the easy way. I am thinking that removing and replacing the hub without repacking, assuming it can be done cleanly, is all that I need to do
- unless there is an obvious problem. What do you all recommend? Thanks.
--
Armand Minnie
Marana, AZ
'76 Eleganza II TZE166V103202
http://www.minniebiz.com
http://www.gmcws.org
 
You can't get at the rotor mounting bolts with the hub on the coach if I remember right.

Great design!

Basically be very very careful of your rotors!

________________________________
From: Gmclist on behalf of Armand Minnie
Sent: Thursday, July 13, 2017 2:10:53 PM
To: gmclist
Subject: [GMCnet] Replacing front brake rotor - removing bearings?

The maintenance manual says to remove and repack the OEM front bearing as part of replacing the rotor and I am trying to understand why. I think it is
because you have the opportunity. But, I have the zerk fittings on my hubs and shoot some grease in there annually with the axle bolts loosened -
repacking the easy way. I am thinking that removing and replacing the hub without repacking, assuming it can be done cleanly, is all that I need to do
- unless there is an obvious problem. What do you all recommend? Thanks.
--
Armand Minnie
Marana, AZ
'76 Eleganza II TZE166V103202
http://www.minniebiz.com
http://www.gmcws.org

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I'm easy. If it does not have obvious slack, has been taking grease well and
expelling the old, keep it simple. Leave well enough alone. If it ain't broke,
...

my nickel's worth
bdub

-----Original Message-----
From: Gmclist On Behalf Of Armand Minnie
Sent: Thursday, July 13, 2017 2:11 PM

The maintenance manual says to remove and repack the OEM front bearing as part
of replacing the rotor and I am trying to understand why. I think it is because
you have the opportunity. But, I have the zerk fittings on my hubs and shoot
some grease in there annually with the axle bolts loosened - repacking the easy
way. I am thinking that removing and replacing the hub without repacking,
assuming it can be done cleanly, is all that I need to do
- unless there is an obvious problem. What do you all recommend? Thanks.
 
Read here
http://bdub.net/gmcmotorhome.info/front.html

> The maintenance manual says to remove and repack the OEM front bearing as
> part of replacing the rotor and I am trying to understand why. I think it is
> because you have the opportunity. But, I have the zerk fittings on my hubs
> and shoot some grease in there annually with the axle bolts loosened -
> repacking the easy way. I am thinking that removing and replacing the hub
> without repacking, assuming it can be done cleanly, is all that I need to do
> - unless there is an obvious problem. What do you all recommend? Thanks.
> --
> Armand Minnie
> Marana, AZ
> '76 Eleganza II TZE166V103202
> http://www.minniebiz.com
> http://www.gmcws.org
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://bdub.net/gmcmotorhome.info/
Alternator Protection Cable
http://bdub.net/gmcmotorhome.info/APC.html
 
>
> Read here
> http://bdub.net/gmcmotorhome.info/front.html
>

And the good news is.. If you screw it up,you can always go with the one
ton final answer..

>
>
> On Thu, Jul 13, 2017 at 12:11 PM Armand Minnie

>
>> The maintenance manual says to remove and repack the OEM front bearing as
>> part of replacing the rotor and I am trying to understand why. I think it is
>> because you have the opportunity. But, I have the zerk fittings on my
>> hubs and shoot some grease in there annually with the axle bolts loosened -
>> repacking the easy way. I am thinking that removing and replacing the hub
>> without repacking, assuming it can be done cleanly, is all that I need to do
>> - unless there is an obvious problem. What do you all recommend? Thanks.
>> --
>> Armand Minnie
>> Marana, AZ
>> '76 Eleganza II TZE166V103202
>> http://www.minniebiz.com
>> http://www.gmcws.org
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> --
> Gene Fisher -- 74-23,77PB/ore/ca
> “Give a man a fish; you have fed him for today --- give him a URL and
> -------
> http://bdub.net/gmcmotorhome.info/
> Alternator Protection Cable
> http://bdub.net/gmcmotorhome.info/APC.html
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://bdub.net/gmcmotorhome.info/
Alternator Protection Cable
http://bdub.net/gmcmotorhome.info/APC.html
 
Armand,

I agree with your logic; I have Dave Lenzi hubs and knuckles on both my Avions and a set to put on my Kingsley. I grease the Avion
in the USA yearly as well.

Having noted this if I were you I'd take the front bearing apart "for the hell of it" to see how my yearly greasing program was
working.

All it will cost you is a new seal, some grease, and time.

It is most important that you use the lower tool in this picture when replacing the seal to locate it properly in the knuckle.

http://www.appliedgmc.com/prod.itml/icOid/778

Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808


-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Armand Minnie
Sent: Friday, July 14, 2017 5:11 AM
To: gmclist
Subject: [GMCnet] Replacing front brake rotor - removing bearings?

The maintenance manual says to remove and repack the OEM front bearing as part of replacing the rotor and I am trying to understand
why. I think it is because you have the opportunity. But, I have the zerk fittings on my hubs and shoot some grease in there
annually with the axle bolts loosened - repacking the easy way. I am thinking that removing and replacing the hub without repacking,
assuming it can be done cleanly, is all that I need to do - unless there is an obvious problem. What do you all recommend? Thanks.
--
Armand Minnie
Marana, AZ
'76 Eleganza II TZE166V103202
http://www.minniebiz.com
http://www.gmcws.org
 
In order to remove the rotor you must press the bearings off the hub. The center hole in the rotor is to small to allow bearings to go thru.
--
C. Boyd
76 Crestmont
East Tennessee
 
I wouldn't touch the front wheel bearings till they need to be touched.

Too easy to screw things up by opening them up

________________________________
From: Gmclist on behalf of Rob Mueller
Sent: Thursday, July 13, 2017 5:56:57 PM
To: gmclist
Subject: Re: [GMCnet] Replacing front brake rotor - removing bearings?

Armand,

I agree with your logic; I have Dave Lenzi hubs and knuckles on both my Avions and a set to put on my Kingsley. I grease the Avion
in the USA yearly as well.

Having noted this if I were you I'd take the front bearing apart "for the hell of it" to see how my yearly greasing program was
working.

All it will cost you is a new seal, some grease, and time.

It is most important that you use the lower tool in this picture when replacing the seal to locate it properly in the knuckle.

http://www.appliedgmc.com/prod.itml/icOid/778

Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808

-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Armand Minnie
Sent: Friday, July 14, 2017 5:11 AM
To: gmclist
Subject: [GMCnet] Replacing front brake rotor - removing bearings?

The maintenance manual says to remove and repack the OEM front bearing as part of replacing the rotor and I am trying to understand
why. I think it is because you have the opportunity. But, I have the zerk fittings on my hubs and shoot some grease in there
annually with the axle bolts loosened - repacking the easy way. I am thinking that removing and replacing the hub without repacking,
assuming it can be done cleanly, is all that I need to do - unless there is an obvious problem. What do you all recommend? Thanks.
--
Armand Minnie
Marana, AZ
'76 Eleganza II TZE166V103202
http://www.minniebiz.com
http://www.gmcws.org

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IF the rotor is within spec...In terms of thickness, or not gouged up, or warped..... because these rotors are so rare and expensive, what I do is put
some 80 grit emery cloth or 80 grit sand paper on a random orbital sander and scratch the shit out of them. Do only enough to rough up and break the
glaze. New pads will then wear into that scratched up metal. You can do this without removing the knuckle. Just spin the rotor as you are doing it.
Trick is to do the maintenance BEFORE the pads get down to the metal backing and score the rotor. Do it that way and you may never have to replace
rotors in your lifetime. JMHO
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.
 
Larry,

I agree, prepping the disks as you note is especially important if you use Performance Friction pads:

https://www.amazon.com/Performance-Friction-0052-20-Carbon-Metallic/dp/B000EJBSZI

The pores in the cast iron are opened up by the sanding and material gets transferred from the pads to the disk. Dave Lenzi noted
that his disks haven't shown any wear in 80,000 miles.

Plus they stop a hell of a lot better. As far as needing to be warm to stop a myth as Double Trouble stops well the first time I hit
the brakes.

Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808


-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Larry
Sent: Saturday, July 15, 2017 4:37 AM
To: gmclist
Subject: Re: [GMCnet] Replacing front brake rotor - removing bearings?

IF the rotor is within spec...In terms of thickness, or not gouged up, or warped..... because these rotors are so rare and
expensive, what I do is put
some 80 grit emery cloth or 80 grit sand paper on a random orbital sander and scratch the shit out of them. Do only enough to rough
up and break the
glaze. New pads will then wear into that scratched up metal. You can do this without removing the knuckle. Just spin the rotor as
you are doing it.
Trick is to do the maintenance BEFORE the pads get down to the metal backing and score the rotor. Do it that way and you may never
have to replace
rotors in your lifetime. JMHO
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.

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