Re: [Amc-list] disk brake hack

[Frank Swygert <farna@xxxxxxx>]

If you can get them try just bigger wheel cylinders. Sounds like you're putting more fluid to the back than needed. A larger wheel cylinder will need the greater volume of fluid and won't lock the brakes. You may have to get 2-3 sets of wheel cylinders to find out what size you need though. Six cylinder 62 Classics used 15/16" rear wheel cylinders, V-8s used 7/8". The 7/8" wheel cylinder applied more pressure than a 15/16". You probably need a 1" or 1-1/16" rear wheel cylinder. Unfortunately those are Wagner rear brakes (there is a short rod between the shoe and wheel cylinder -- Bendix have no rod, the piston acts directly on the shoe, or rather the "rod" is part of the shoe stamping) and larger wheel cylinders will be tough to find. 

Sounds like the best (and cheapest) bet is an adjustable proportioning valve in the rear line. The 2.5" wide drums use the smaller wheel cylinder, which would make matters worse, not better. Braking area isn't the problem, lack of space for the amount of fluid being pushed back there is. A proportioning valve will reduce the amount of fluid and pressure. 

---------------------------
Date: Thu, 19 Jul 2007 12:54:02 -0700 (PDT)
From: d stohler <das24rules@xxxxxxxxx>

so, i got the MUCH bigger, better, more responsive
master cylinder on. still have rear brake lock up
first. i have the little 9x2 rear brakes with the
little wheel cylinders. does anybody have a heavy duty
9x2.5 rear brake set up with the big wheel cylinders
they would be willing part with? i would love to
upgrade to disks back there also, but i dont have the
money for that right now. any help would be great.

-- 
Frank Swygert
Publisher, "American Motors Cars" 
Magazine (AMC)
For all AMC enthusiasts
http://farna.home.att.net/AMC.html
(free download available!)

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