Re: [Amc-list] rear wheel lock up problem still

[Matt Haas <mhaas@xxxxxxx>]

Wagner drums were used on American's as well. I know 1966 and early 1967 
used them. Besides Studebaker, they were also used by Volvo and 
International (maybe a couple of others as well). Also, I think that 
Wagner bought out Lockheed's (yes, the same Lockheed involved in 
areospace) brake operation. There were a lot of cars that used Lockheed 
hydraulic brakes but I'm not sure how different those systems are from 
what AMC was using. Wagner also is still in the OEM brake business but 
drums are a dying breed outside of big trucks.

Matt

farna@xxxxxxx wrote:
> The bad news is that you have Wagner rear brakes. From 58-69 ALL Series 10 six cylinder cars used Wagner brakes, all others used Bendix. Unfortunately the 15/16 wheel cylinders you have now are the smallest Wagner wheel cylinders AMC used. So a wheel cylinder change is not likely. I don't know if any other makes used Wagner brakes, Ford used Bendix. Wheel cylinders, backing plates, and top anchor blocks are different between Wagner and Bendix -- to different to consider modifying. You'd have to replace the backing plates and all on your axle with those from an American. Since you were contemplating an axle swap later, you should go ahead and get an adjustable proportioning valve. It's safe to use behind the combo valve you have now -- it will only reduce pressure to the set point. 
> 
> Studebaker may have used Wagners. If so, the six cylinder Lark may have used smaller wheel cylinders -- the 58-63 American used 13/16" wheel cylinders and was about the same size as the Lark. That's a 1/8" drop, the max I'd go, but would be worth a try. 
> 
> --
> Frank Swygert
> Publisher, "American Motors Cars" 
> Magazine (AMC)
> For all AMC enthusiasts
> http://farna.home.att.net/AMC.html
> (free download available!)
> 
>  -------------- Original message ----------------------
> From: "Swygert, Francis G MSgt 436 CES/CECM" <Francis.Swygert3@xxxxxxxxxxxx>
>> In my long winded post on brakes, I forgot to mention changing the rear
>> wheel cylinder size!! Thanks Tom J, for posting that!! 
>>
>> Check your TSM, Dave, for the wheel cylinder size. Americans typically
>> used a 1/16" smaller wheel cylinder. Wheel cylinders have the opposite
>> effect as master cylinders. They operate on the total amount of surface
>> area that has pressure applied, so a large diameter wheel cylinder has
>> more power than a small one, though it takes a slight amount of
>> additional volume to move it as far. Again, this can cost a little --
>> you have to move in 1/16" increments. In your case a 1/16" smaller one
>> will probably do the trick. 
>>
>> I'll have to check my TSMs when I get home to give a recommendation. 
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-- 
mhaas@xxxxxxx
Cincinnati, OH
http://www.mattsoldcars.com
1967 Rambler American wagon
1968 Rambler American sedan
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