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Rear Disc Brakes Rotor Replacement

TP
Trevor Pordage
Sun, Sep 12, 2021 7:21 AM

Hi
I have had a rear caliper stick and take out my rear Passenger rotor. my rear discs were installed by Bobby Moore.
when we purchased the coach there was a spare rotor hidden under one of the beds.
the numbers on this rotor equate to a caddilac/toronado front rotor and it appears
to have had 1 factory hole elongated and then 3 extra holes drilled out to give 4 holes at 90 degrees apart.
i have just pulled off the rear hub and the disk that was installed had 8 mounting holes.

am i correct in assming that maybe Bobby installed an original GMC motor home front rotor

i have looked in the parts manual but it shows the front hub as a N.S.S. (which i assume means Not Serviced Separately)
but there is 8bolts required to hold the rotor on

i see from Applied website that the replacement front rotors look like my rear rotor

is it safe to assume that it is considered that 4 bolts are enough to hold the rotor to the Hub

i also need to recreate a spare rotor  and have access to a lathe and milling machine
as i am in australia it has been easier for me to souce Eldorado Rotors
also my front rotors are below min thickness does anyone have the diameter required to turn out the center bore of the rotor  for the fronts

--
Trevor
Brisbane Australia
Siesta Koala 76 Edgemont (old Bobby Moores)
71 Cadillac Eldo Convert
58 Cadillac Eldorado Brougham Project

Hi I have had a rear caliper stick and take out my rear Passenger rotor. my rear discs were installed by Bobby Moore. when we purchased the coach there was a spare rotor hidden under one of the beds. the numbers on this rotor equate to a caddilac/toronado front rotor and it appears to have had 1 factory hole elongated and then 3 extra holes drilled out to give 4 holes at 90 degrees apart. i have just pulled off the rear hub and the disk that was installed had 8 mounting holes. am i correct in assming that maybe Bobby installed an original GMC motor home front rotor i have looked in the parts manual but it shows the front hub as a N.S.S. (which i assume means Not Serviced Separately) but there is 8bolts required to hold the rotor on i see from Applied website that the replacement front rotors look like my rear rotor is it safe to assume that it is considered that 4 bolts are enough to hold the rotor to the Hub i also need to recreate a spare rotor and have access to a lathe and milling machine as i am in australia it has been easier for me to souce Eldorado Rotors also my front rotors are below min thickness does anyone have the diameter required to turn out the center bore of the rotor for the fronts -- Trevor Brisbane Australia Siesta Koala 76 Edgemont (old Bobby Moores) 71 Cadillac Eldo Convert 58 Cadillac Eldorado Brougham Project
WA
Wally Anderson
Sun, Sep 12, 2021 4:24 PM

cadelec wrote on Sun, 12 September 2021 02:21

Hi
I have had a rear caliper stick and take out my rear Passenger rotor. my rear discs were installed by Bobby Moore.
when we purchased the coach there was a spare rotor hidden under one of the beds.
the numbers on this rotor equate to a caddilac/toronado front rotor and it appears
to have had 1 factory hole elongated and then 3 extra holes drilled out to give 4 holes at 90 degrees apart.
i have just pulled off the rear hub and the disk that was installed had 8 mounting holes.

the rotor i am replacing has 8 holes evenly spaced so this is not an converted eldorado rotor
i am wondering why there are 8 holes

i have looked in the parts manual but it shows the front hub as a N.S.S. (which i assume means Not Serviced Separately)

i see from Applied website that the replacement front rotors look like my rear rotor

is it safe to assume that it is considered that 4 bolts are enough to hold the rotor to the Hub

i also need to recreate a spare rotor  and have access to a lathe and milling machine
as i am in australia it has been easier for me to souce Eldorado Rotors
also my front rotors are below min thickness does anyone have the diameter required to turn out the center bore of the rotor  for the fronts

Rotor information here
http://www.gmcmhphotos.com/photos/g6949-toronado-rotors-for-front.html
http://www.gmcmhphotos.com/photos/g6949-toronado-rotors-for-front.html
Just what we did

Wally Anderson
Omaha NE
75 Glenbrook
Megasquirt III injection
Bosch Hydro-Max
Manny reaction arm system
Branscombe Kelsey Hayes park brake
http://wallyandsue.blogspot.com/

cadelec wrote on Sun, 12 September 2021 02:21 > Hi > I have had a rear caliper stick and take out my rear Passenger rotor. my rear discs were installed by Bobby Moore. > when we purchased the coach there was a spare rotor hidden under one of the beds. > the numbers on this rotor equate to a caddilac/toronado front rotor and it appears > to have had 1 factory hole elongated and then 3 extra holes drilled out to give 4 holes at 90 degrees apart. > i have just pulled off the rear hub and the disk that was installed had 8 mounting holes. > > the rotor i am replacing has 8 holes evenly spaced so this is not an converted eldorado rotor > i am wondering why there are 8 holes > > i have looked in the parts manual but it shows the front hub as a N.S.S. (which i assume means Not Serviced Separately) > > > i see from Applied website that the replacement front rotors look like my rear rotor > > is it safe to assume that it is considered that 4 bolts are enough to hold the rotor to the Hub > > i also need to recreate a spare rotor and have access to a lathe and milling machine > as i am in australia it has been easier for me to souce Eldorado Rotors > also my front rotors are below min thickness does anyone have the diameter required to turn out the center bore of the rotor for the fronts Rotor information here http://www.gmcmhphotos.com/photos/g6949-toronado-rotors-for-front.html http://www.gmcmhphotos.com/photos/g6949-toronado-rotors-for-front.html Just what we did -- Wally Anderson Omaha NE 75 Glenbrook Megasquirt III injection Bosch Hydro-Max Manny reaction arm system Branscombe Kelsey Hayes park brake http://wallyandsue.blogspot.com/
TP
Trevor Pordage
Sun, Sep 12, 2021 8:24 PM

Thanks Wally
Exactly what I was looking for

Trevor
Brisbane Australia
Siesta Koala 76 Edgemont (old Bobby Moores)
71 Cadillac Eldo Convert
58 Cadillac Eldorado Brougham Project

Thanks Wally Exactly what I was looking for -- Trevor Brisbane Australia Siesta Koala 76 Edgemont (old Bobby Moores) 71 Cadillac Eldo Convert 58 Cadillac Eldorado Brougham Project
JK
Jim Kanomata
Mon, Sep 13, 2021 4:22 AM

You might see if the rear hose could have collapsed and cause the lock up.

On Sun, Sep 12, 2021 at 1:24 PM Trevor Pordage 5758brougham@gmail.com
wrote:

Thanks Wally
Exactly what I was looking for

Trevor
Brisbane Australia
Siesta Koala 76 Edgemont (old Bobby Moores)
71 Cadillac Eldo Convert
58 Cadillac Eldorado Brougham Project


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--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502

You might see if the rear hose could have collapsed and cause the lock up. On Sun, Sep 12, 2021 at 1:24 PM Trevor Pordage <5758brougham@gmail.com> wrote: > Thanks Wally > Exactly what I was looking for > -- > Trevor > Brisbane Australia > Siesta Koala 76 Edgemont (old Bobby Moores) > 71 Cadillac Eldo Convert > 58 Cadillac Eldorado Brougham Project > _______________________________________________ > GMCnet mailing list > Unsubscribe or Change List Options: > -- Jim Kanomata ASE Applied/GMC, Newark,CA jimk@appliedairfilters.com http://www.gmcrvparts.com 1-800-752-7502
TP
Trevor Pordage
Mon, Sep 13, 2021 10:09 PM

Thanks jim
The hose is OK i had a split in the caliper dust seal causing i pad to drag

Trevor
Brisbane Australia
Siesta Koala 76 Edgemont (old Bobby Moores)
71 Cadillac Eldo Convert
58 Cadillac Eldorado Brougham Project

Thanks jim The hose is OK i had a split in the caliper dust seal causing i pad to drag -- Trevor Brisbane Australia Siesta Koala 76 Edgemont (old Bobby Moores) 71 Cadillac Eldo Convert 58 Cadillac Eldorado Brougham Project
CS
Carl Stouffer
Tue, Sep 14, 2021 12:28 AM

The rotors on mine (Applied GMC Disc Brake conversion with Reaction Arms) are mounted to the hubs with four bolts:

http://www.gmcmhphotos.com/photos/disc-brakes-2fchuck-aulgur-reaction-arm-install/p40070-spacer-installed.html

Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles,
Solar battery charging.  GMCSJ and GMCMI member

The rotors on mine (Applied GMC Disc Brake conversion with Reaction Arms) are mounted to the hubs with four bolts: http://www.gmcmhphotos.com/photos/disc-brakes-2fchuck-aulgur-reaction-arm-install/p40070-spacer-installed.html -- Carl Stouffer '75 ex Palm Beach Tucson, AZ. Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member