Re: [Amc-list] disk brake hack

[Wrambler242@xxxxxxxxxxx]

I got to ask, Were would you look to find smaller wheel cylinders???

--
Mark Price
Morgantown, WV
1969 AMC Rambler, 4.0L, EFI, T-5
" I was different before people dared to be different" 

 -------------- Original message ----------------------
From: Tom Jennings <tomj@xxxxxxx>
> On Thu, 2007-07-19 at 12:54 -0700, d stohler wrote:
> > 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.
> 
> Just swapping parts around will probably make things WORSE. If the rear
> is grabby now, putting bigger brakes in it will make it grabbier.
> 
> All you need to do is change out rear wheel cylinders to get the
> balance. If it's just a bit grabby, switch to a 1/16" smaller; if it's
> dangerously grabby in the rear, try 1/8" smaller.
> 
> Conversely, you go put a BIGGER wheel cylinder in the front, to make the
> fronts grab faster than the rears (assuing you have drums in front). If
> you have disks up front you're pretty much stuck with adjusting the
> rears to match.
> 
> 
> 
> The hydraulic balance thing isn't hard to understand -- for a given
> master cylinder, when you make a wheel cylinder bore larger that brake
> grabs sooner and harder. 
> 
> What I would do is, find some AMC car that's close in weight and
> distribution (eg. Gremlin vs. station wagon) and start with wheel
> cylinder ratios from that car. Then go plus and minus.
> 
> Wheel cyls are like $10 - $30 each, and all you gotta do afterwards is
> bleed at the wheel. Easy and relatively cheap.
> 
> 
> When you have front to rear balance OK, THEN fiddle the master cylinder.
> Changing it WILL NOT change balance (see note) only overall pressure.
> It's a waste of tim to fiddle that first.
> 
> 
> 
> NOTE: Some wagner master cylinders allegedly have different bores for
> front and rear brakes but I never found one in a TSM or aftermarket
> catalog.
> 
> 
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