Re: Disc brakes.

[William Cole <wedge64@xxxxxxxxxxx>]

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

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