[GMCnet] Gmc brake problems [message #270739] |
Thu, 29 January 2015 12:23 |
Advanced Concept Ener
Messages: 112 Registered: December 2014
Karma: 0
|
Senior Member |
|
|
To determine extent of curvature problem how about bluing the drums and making a few stops to see how much of the shoe makes contact? I could then try taking a sander to the spot and trying again until I get 90+ area contact. Once I figure how bad one wheel is I can use dimensions as a template for rest of drums. Anyone know of bluing compound that won't ruin brake linings?
Sent from my iPad
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
Re: [GMCnet] Gmc brake problems [message #270751 is a reply to message #270739] |
Thu, 29 January 2015 14:11 |
kerry pinkerton
Messages: 2565 Registered: July 2012 Location: Harvest, Al
Karma: 15
|
Senior Member |
|
|
I don't think you have to go through all that, just see if the male radius of the shoe matches the female radius of the drum.
This is really a very rare problem in this day and age. Back when local shops would rivet new linings on shoes, it was common to arc the shoes to fit the drum inside diameter. I'd be pretty surprised if this was a problem on your coach unless someone installed the wrong shoes and that should be pretty apparent just by pulling a drum and laying a shoe up against it.
Even then, I'm not sure that the shoes not having a correct arc would effect your pedal. What typically happens is that the shoe doesn't have full contact and therefore more PSI where it does have contact. The shoe wears down in that area pretty quick and 'arcs' itself. I recall back when I was a pup that the conventional wisdom was that shoes needed some time to 'bed in' before being put in hard use.
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
|
|
|
Re: [GMCnet] Gmc brake problems [message #271144 is a reply to message #270739] |
Tue, 03 February 2015 20:39 |
Bob de Kruyff
Messages: 4260 Registered: January 2004 Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
Advanced Concept Ener wrote on Thu, 29 January 2015 11:23To determine extent of curvature problem how about bluing the drums and making a few stops to see how much of the shoe makes contact? I could then try taking a sander to the spot and trying again until I get 90+ area contact. Once I figure how bad one wheel is I can use dimensions as a template for rest of drums. Anyone know of bluing compound that won't ruin brake linings?
Sent from my iPad
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Bluing will not hurt a thing but see my other post on curvature. New linings should only contact the drum in the center 2/3 of the drum!!!
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|
Re: [GMCnet] Gmc brake problems [message #271145 is a reply to message #270751] |
Tue, 03 February 2015 20:42 |
Bob de Kruyff
Messages: 4260 Registered: January 2004 Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
kerry pinkerton wrote on Thu, 29 January 2015 13:11I don't think you have to go through all that, just see if the male radius of the shoe matches the female radius of the drum.
This is really a very rare problem in this day and age. Back when local shops would rivet new linings on shoes, it was common to arc the shoes to fit the drum inside diameter. I'd be pretty surprised if this was a problem on your coach unless someone installed the wrong shoes and that should be pretty apparent just by pulling a drum and laying a shoe up against it.
Even then, I'm not sure that the shoes not having a correct arc would effect your pedal. What typically happens is that the shoe doesn't have full contact and therefore more PSI where it does have contact. The shoe wears down in that area pretty quick and 'arcs' itself. I recall back when I was a pup that the conventional wisdom was that shoes needed some time to 'bed in' before being put in hard use.
With all due respect Kerry, a new shoe should NEVER have full contact with the drum--see my other posts on this. They should have no more than 2/3 contact around the center of the shoe.
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|
Re: [GMCnet] Gmc brake problems [message #271146 is a reply to message #270751] |
Tue, 03 February 2015 20:46 |
Bob de Kruyff
Messages: 4260 Registered: January 2004 Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
kerry pinkerton wrote on Thu, 29 January 2015 13:11I don't think you have to go through all that, just see if the male radius of the shoe matches the female radius of the drum.
This is really a very rare problem in this day and age. Back when local shops would rivet new linings on shoes, it was common to arc the shoes to fit the drum inside diameter. I'd be pretty surprised if this was a problem on your coach unless someone installed the wrong shoes and that should be pretty apparent just by pulling a drum and laying a shoe up against it.
Even then, I'm not sure that the shoes not having a correct arc would effect your pedal. What typically happens is that the shoe doesn't have full contact and therefore more PSI where it does have contact. The shoe wears down in that area pretty quick and 'arcs' itself. I recall back when I was a pup that the conventional wisdom was that shoes needed some time to 'bed in' before being put in hard use.
With all due respect Kerry, a new shoe should NEVER have full contact with the drum--see my other posts on this. They should have no more than 2/3 contact around the center of the shoe.
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|