| Rear Brake Shoes [message #244948] |
Tue, 25 March 2014 07:45  |
quadracerx1
Messages: 207
Registered: April 2013
Location: Puyallup, Washington
Karma: 1
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Ok... So now working on the rear brakes, does anyone have current part numbers for the rear shoes and wheel cylinders?
Is the rear disc brake upgrade worth it? I was thinking of the less expensive Cadillac setup? I may go this way if I have to replace drums etc.... Does anyone have current part numbers for this swap? How difficult is it? How expensive at current prices?
Thanks again,
Steve
75 26' GMC Glenbrook
Puyallup, Washington
[Updated on: Tue, 25 March 2014 07:46] Report message to a moderator |
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| Re: Rear Brake Shoes [message #244949 is a reply to message #244948] |
Tue, 25 March 2014 07:52  |
appie
Messages: 902
Registered: April 2013
Location: denmark
Karma: 2
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Well adjusted drum breaks are great We have been driving trucks and busses with drum breaks for ever.
They will need adjustment and are more prone to overheating.
Discs just make live easier, but you can stop a 40 tonner with drums
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: [GMCnet] Rear Brake Shoes [message #244957 is a reply to message #244948] |
Tue, 25 March 2014 08:45 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Steve,
Double Trouble has 80mm calipers on the front wheels, Caddy disks on the middle wheels, and drum brakes on the rear wheels. I am
very happy with the way it stops.
Perusing this link on Brakes should provide you will more information than you want! The Caddy swap is listed.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Steve
Sent: Tuesday, March 25, 2014 11:45 PM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] Rear Brake Shoes
Ok... So now working on the rear brakes, does anyone have current part numbers for the rear shoes and wheel cylinders?
Is the rear disc brake upgrade worth it? I was thinking of the less expensive Cadillac setup? I may go this way if I have to replace
drums etc.... Does anyone have current part numbers for this swap? How difficult is it?
Thanks again,
Steve
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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] Rear Brake Shoes [message #244959 is a reply to message #244957] |
Tue, 25 March 2014 08:46 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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WHAT LINK?
On Tue, Mar 25, 2014 at 6:48 AM, Robert Mueller <robmueller@iinet.net.au>wrote:
> Steve,
>
> Double Trouble has 80mm calipers on the front wheels, Caddy disks on the
> middle wheels, and drum brakes on the rear wheels. I am
> very happy with the way it stops.
>
> Perusing this link on Brakes should provide you will more information than
> you want! The Caddy swap is listed.
>
> Regards,
> Rob M.
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org [mailto:
> gmclist-bounces@temp.gmcnet.org] On Behalf Of Steve
> Sent: Tuesday, March 25, 2014 11:45 PM
> To: gmclist@temp.gmcnet.org
> Subject: [GMCnet] Rear Brake Shoes
>
> Ok... So now working on the rear brakes, does anyone have current part
> numbers for the rear shoes and wheel cylinders?
>
> Is the rear disc brake upgrade worth it? I was thinking of the less
> expensive Cadillac setup? I may go this way if I have to replace
> drums etc.... Does anyone have current part numbers for this swap? How
> difficult is it?
>
> Thanks again,
>
> Steve
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
"Give a man a fish; you have fed him for today --- give him a URL and
-------
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Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: Rear Brake Shoes [message #244966 is a reply to message #244964] |
Tue, 25 March 2014 09:34 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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What is the feeling about using 1 116 or 1 1/8" slave cylinders on the rears drums?
This would be with the reaction arm system.
I'm sure disks would be better but my budget is spent for upgrades this year!
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: Rear Brake Shoes [message #244977 is a reply to message #244948] |
Tue, 25 March 2014 11:23 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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That sure seems to make sense (wider brake pads and mechanism to take advantage of the wider-than-currently-necessary drums). What's the cost of the upgrade?
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: [GMCnet] Rear Brake Shoes [message #244999 is a reply to message #244948] |
Tue, 25 March 2014 12:31 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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I bought the cylinders, shoes, and spring kits from Applied, about the same as the local parts house. I'm just doing the reaction arm with drums in back, I think they'll be sufficient. We're putting disks on Stick's coach, so we'll have something of a comparison when we're done.
--johnny
'76 23' transmode norris
Braselton ga
________________________________
From: Steve <quadracerx@aol.com>
To: gmclist@temp.gmcnet.org
Sent: Tuesday, March 25, 2014 8:45 AM
Subject: [GMCnet] Rear Brake Shoes
Ok... So now working on the rear brakes, does anyone have current part numbers for the rear shoes and wheel cylinders?
Is the rear disc brake upgrade worth it? I was thinking of the less expensive Cadillac setup? I may go this way if I have to replace drums etc.... Does anyone have current part numbers for this swap? How difficult is it?
Thanks again,
Steve
--
75 26' GMC Glenbrook
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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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| Re: [GMCnet] Rear Brake Shoes [message #245000 is a reply to message #244998] |
Tue, 25 March 2014 12:44 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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| A Hamilto wrote on Tue, 25 March 2014 12:31 |
| emerystora wrote on Tue, 25 March 2014 11:44 |
Wider brake shoes will not give you any better braking. You have to understand the relationship between coefficient of friction and force.
The only thing the wider shoe does is to wear longer.
Emery Stora
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Tom Hampton's kit includes larger wheel cylinders so you get increased pressure on the increased area.
I think we go through this clarification every time Tom's kit is mentioned.
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Coefficient of friction is unitless. More area does not equal more friction.
However more area spreads the heat over more brake lining so it has a wee bit less brake fade.
The lining material probably more to do with anything than the shoe size. Good lining won't fade with temperature as much as cheap linings
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] Rear Brake Shoes [message #245002 is a reply to message #245000] |
Tue, 25 March 2014 13:15 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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| Keith V wrote on Tue, 25 March 2014 12:44 |
| A Hamilto wrote on Tue, 25 March 2014 12:31 |
| emerystora wrote on Tue, 25 March 2014 11:44 |
Wider brake shoes will not give you any better braking. You have to understand the relationship between coefficient of friction and force.
The only thing the wider shoe does is to wear longer.
Emery Stora
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Tom Hampton's kit includes larger wheel cylinders so you get increased pressure on the increased area.
I think we go through this clarification every time Tom's kit is mentioned.
|
Coefficient of friction is unitless. More area does not equal more friction.
However more area spreads the heat over more brake lining so it has a wee bit less brake fade.
The lining material probably more to do with anything than the shoe size. Good lining won't fade with temperature as much as cheap linings
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Lining material being equal, a larger shoe with the same size cylinder will produce the same amount of friction as the smaller shoe. Spread out over more area reduces wear.
That's what Emery was saying.
A larger cylinder will put more pressure on the larger shoe.
If the pressure per unit area is the same on the larger shoe with bigger cylinder as the smaller shoe with smaller cylinder,
there will be more pressure overall and more friction, for more energy dissapated per unit of time, and shorter stopping distance.
Like I said, we go through this every time Tom's wider shoe kit comes up, because it is assumed it is just shoes.
THE KIT IS NOT JUST SHOES. IT IS LARGER (1-1/16") CYLINDERS AS WELL. So the larger shoes WITH LARGER WHEEL CYLINDERS decrease stopping distance.
You might get a similar gain with only larger wheel cylinders, but the shoes will wear out quicker.
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| Re: [GMCnet] Rear Brake Shoes [message #245012 is a reply to message #245000] |
Tue, 25 March 2014 14:27 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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| Keith V wrote on Tue, 25 March 2014 11:44 |
| A Hamilto wrote on Tue, 25 March 2014 12:31 |
| emerystora wrote on Tue, 25 March 2014 11:44 |
Wider brake shoes will not give you any better braking. You have to understand the relationship between coefficient of friction and force.
The only thing the wider shoe does is to wear longer.
Emery Stora
|
Tom Hampton's kit includes larger wheel cylinders so you get increased pressure on the increased area.
I think we go through this clarification every time Tom's kit is mentioned.
|
Coefficient of friction is unitless. More area does not equal more friction.
However more area spreads the heat over more brake lining so it has a wee bit less brake fade.
The lining material probably more to do with anything than the shoe size. Good lining won't fade with temperature as much as cheap linings
|
I'm going through this right now with our trailer brakes. What Emery says is true, although the coefficient of friction changes dynamically with temperature. If you think of it, brakes turn kinetic energy into heat. The lining characteristics change with heat, although most lining manufacturers have figured out how to control that. A larger swept area helps moderate the amount of heat generated. Personally I think the greater lining surface will help a bit but not enough to make it worthwhile. Another thing we haven't discussed much recently is the effectiveness of the lining material itself. I'm seeing some dramatic differences in "aggressiveness" of materials.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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