RE: Disc brakes.

[Kevin Merkley <krmerkley@xxxxxxxxx>]

Hi Bill,

When I did my brake swap I made sure that I bought the master cylinder 
for a 74 Dart with manual brakes (discs in front).  If they gave you a 
master cylinder from a drum/drum car, you may end up with the symptoms 
you are experiencing.

I have manual brakes on my 64 440 and they work fine.  All my brakes 
were from a 74 Dart and i used the prop valve from the 74 Dart.  My 
calipars are on the front as they were on the Dart.

Regards,

K.

William Cole wrote:
> 
> Menko,
> I've never locked up the brakes at all, never had to. I have had to stop
> quickly a couple of times but never had anything lock up. I'm sure the
> front brakes are working like they're supposed to. I have a line lock
> and if I engage it, it will hold the car and let me spin the back tires.
> I don't have an adjustable prop. valve. Just one of the regular ones.
> And if I hold the brakes, you can't turn the rear tires at all, so, I
> assume the system is bled correctly and all 4 are working like they
> should.
> I don't know what the piston size is on the MP I have and I'm pretty
> sure the MP I got was from a car that wouldn't have had disc on the
> back.
> The rotors I have are for the 73-76 A body cars.
> Thanks for all the input guys!
> 
> Bill
> PS: Menko,the computer is working just perfect yet.
> On Thu, 12 Apr 2007 09:26:51 -0700, "Menko" <menkoj@xxxxxxxxx> said:
> > Ok, here's my .02 worth on figuring out your brake issue.  There are 2
> > separate issues from what I have heard: difficult pedal action, and
> > poor stopping ability.  That could indicate multiple problems, and
> > since you bled them very well, we should look at other things.
> > 
> > Besides being difficult to stop, what happens when you lock up the
> > brakes?  Do the fronts lock first for the rears?  If the rears are
> > locking, its possible your front discs are not engaging fully,
> > preventing full braking power.  You would need to check adjustment on
> > your prop valve, to lessen the amount being sent to the rear.
> > 
> > Something else stuck in my head--you used a master cylinder from a
> > disc/disc car.  Unless you put a residual pressure valve on the rear
> > drums, or replaced the rear wheel cylinders with modern ones, the rear
> > drums are not getting the residual pressure they need for energizing.
> > 
> > Master Cylinder: the bore size people are talking about is really an
> > issue.  later model cars have 15/16" bore master cylinders for power
> > brakes that allow the pedal to travel further which would let you
> > modulate it more.  The same amount of pressure if required, but you
> > have more travel to apply it in.  Conversely, some of the manual brake
> > master cylinders for E body cars or the aluminum MP master cylinder
> > can be as large as 1 1/16.  Unless you are running 13" or larger
> > rotors, this would probably be more pressure than most people want.
> > 
> > That's where I would start looking, hope it helps Bill!
> > 
> > MJ
> -- 
>   William Cole
>   wedge64@xxxxxxxxxxx
> 
> -- 
> http://www.fastmail.fm - Access all of your messages and folders
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> 



Kevin R. Merkley
Thunder Bay, Ontario
64 Dodge 440 2dr HT (Cdn)


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