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03-19-2009, 04:33 PM
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#21
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Master of Universe
2008 25' Safari FB SE
Grand Junction
, Colorado
Join Date: Sep 2007
Posts: 12,813
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Quote:
Originally Posted by gnored
Brake backer plate? Never heard of it.
Gary Nored
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When you remove the brake drum, there's a round plate mounted on the axle with things like brake shoes, springs and such. That, I believe, is the backer plate. I could be wrong, but that's what I recall it to be called.
Gene
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03-19-2009, 04:52 PM
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#22
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Rivet Master 
1991 34' Excella
Princeton
, New Jersey
Join Date: Aug 2003
Posts: 7,070
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This is a shot of the backer plate of the brake assembly. The 2 springs at the top are the return springs. If the forward spring, as you look at the trailer with the brake drum removed, is weak, broken, or the wrong one the brakes will be able to lock up on their own. This is because as the forward shoe comes in contact with the brake drum, turning forward as you drive, it forces the rear brake shoe against the anchor pin, at the top where the 2 springs are hooked on, and with nothing, the spring to overcome this action, the brakes will lock.
Deitz645 beat me to it with the picture of the breakaway switch. Every trailer ever made with electrical brakes had one. If yours is not there someone as bastardized the trailer. I am sup prized that you have had the trailer to shops and they have not picked up on this problem.
__________________
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles
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03-19-2009, 07:55 PM
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#23
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Master of Universe
2008 25' Safari FB SE
Grand Junction
, Colorado
Join Date: Sep 2007
Posts: 12,813
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Howie,
I haven't worked on drum brakes for a long, long time. How often do you replace the springs?
Gene
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03-19-2009, 08:30 PM
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#24
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Rivet Master 
1991 34' Excella
Princeton
, New Jersey
Join Date: Aug 2003
Posts: 7,070
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You real should HAVE to replace the springs. The reason I mentioned them is if they were to fail a possible reaction could be brake lock up as I discribed above.
You clearly do not have a common problem so we may have to look for the uncommon that would result in your problem.
__________________
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles
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03-19-2009, 09:52 PM
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#25
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Master of Universe
2008 25' Safari FB SE
Grand Junction
, Colorado
Join Date: Sep 2007
Posts: 12,813
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Howie,
I don't have any problems, Gary does.
I just wanted to know what you recommend regarding spring replacement. As my memory returns, I think it used to be recommended to replace the springs when the shoes are replaced, but shoes are made so much better now, they may outlast springs.
It appears the electric brakes are not self adjusting. Does that have something to do with being electric, or is it an example of ancient technology living on in Jackson Center?
Gene
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03-19-2009, 10:51 PM
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#26
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Rivet Master 
2003 25' Safari
Kissimmee
, Florida
Join Date: Nov 2002
Posts: 815
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Ancient technology... drum brakes & no self adjust.
__________________
Dan
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03-20-2009, 01:17 AM
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#27
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Rivet Master 

2005 25' Safari
Salem
, Oregon
Join Date: Mar 2006
Posts: 8,438
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Quote:
Originally Posted by CrawfordGene
Howie,
I don't have any problems, Gary does.
I just wanted to know what you recommend regarding spring replacement. As my memory returns, I think it used to be recommended to replace the springs when the shoes are replaced, but shoes are made so much better now, they may outlast springs.
It appears the electric brakes are not self adjusting. Does that have something to do with being electric, or is it an example of ancient technology living on in Jackson Center?
Gene
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 Hi, Gene. As for replaceing the brake springs, it would be the same as with a car with drum brakes.
(1.) Replace the springs when the brake system was at one or more times extremely overheated. [or shoes worn down to the metal] This weakens the springs.
(2.) Replace the springs when they become rusty. Rusty springs get weak and will break. Not real common in this area of the country, but very common in other areas.
(3.) Springs break; From flexing and not being of top quality. Millions of springs are made and a few are going to fail.
(4.) When your trailer brake shoes and magnets are worn out, sometimes it is cheaper the replace them with complete backing plate assemblies instead of piece by piece. [springs included]
An old test we did ages ago was to drop the brake springs on the cement. the good ones would have a little Twang to them and the bad ones would thud, like a piece of lead.
__________________
Bob 2005 Safari 25-B
"Le Petit Chateau Argent" Small Silver Castle
2000 Navigator / 2014 F-150 Eco-Boost / Equal-i-zer / P-3
YAMAHA 2400 / AIR #12144
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03-20-2009, 10:25 AM
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#28
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AnEyeForTexas
1962 26' Overlander
Lockhart
, Texas
Join Date: Oct 2008
Posts: 35
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Thanks for all the suggestions. I'm going to beg a rapairman south of here to take a fresh look at these issues, so maybe something good will come of it.
Regards,
Gary
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