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Re: [GMCnet] Maintaince [message #288822 is a reply to message #288817] Thu, 15 October 2015 16:44 Go to previous messageGo to previous message
USAussie is currently offline  USAussie   United States
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
Senior Member
Ken,

I don't think anyone on this forum can argue with the theories of Blaise Pascal regarding fluid pressure in a closed system; here's
a link to the first in a series of videos that explain his theories:

https://www.youtube.com/watch?v=z5JLF6Bjg4g

Regards,
Rob M.
The Pedantic Mechanic

-----Original Message-----
From: Ken Henderson

Darn you, Jim! You kept me awake last night! Thinking about the
"fix" for your brakes.

I hate to break it to you (and probably start an argument), but
changing the lines should not affect the performance of properly bled
brakes. In fact, you could connect them with either 0.010" ID lines
or 1.0" ID lines without affecting anything except response time or
required force on the MC.

Look at it this way: In a sealed system like brakes, a caliper
responds only to the volume of fluid and pressure supplied to it. So,
if the MC supplies 1 ci of fluid, the caliper will receive that 1 ci,
no more and no less, regardless of any intervening rigid container,
such as the brake lines. (The 1 ci is an arbitrary volume --
obviously the caliper will receive only enough volume to move it the
distance imposed by the force applied; the point is that the volume
can only be exactly what's supplied by the MC, in every case.)

I yield the podium.

Ken H.

On Wed, Oct 14, 2015 at 9:03 PM, Jim Galbavy wrote:
> Came home last week after being out on the road for 3 weeks. The roads
> in New Jersey beat the hell out of ANNIE. ChuckB helped keep her together
> long enough to get her home. Turns out things were looked into.
>
> 1/ The hi strength adjusting bolt for the torsion bar was stripped and
> Chuck was able to raise the front end 3 1/2 inches with a good used
> bolt and nut. Turns out Chuck was right, the torsion bar was worn out and
> replaced at the COOP.
>
> 2/ My brakes sucked on that trip. Chuck seconded that. Turns out the reason
> was the hard brake lines had a too large ID. Means after a few uses of the brake
> pedal the pedal had to almost bottom out. I just was used to it after 13 years.
> Got new lines in the right size from the COOP.
>
> Lessons learned: With a 43 year old motorhome, don't believe anything that the PO
> or his PO did or had done was done correctly. "Trust but verify".
>
> jim galbavy
> '73 x-CL ANNIE
> Lake, Fl


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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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