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More 701 brakes

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zsmith3rd(at)earthlink.ne
Guest

Posted: Thu Apr 20, 2006 4:13 am Post subject: More 701 brakes

List --



The 17 feet of  quarter-inch OD Nylon tubing supplied by ZAC for the brake lines was actually only 14 feet.

Either I move the gear forward, rudder pedals aft, or, get more tubing.



Question is: Which tubing in the Spruce catalog is the replacement, "Nylo-Seal" or "Nylaflow"?



Tubing on hand is Nylon and was made in Canada.  It is marked as .170 ID and fits perfectly on the supplied brass "Poly-Flo" fittings.



Regards & Thanks,



Zed/701/R912/90+%/etc

do not archive

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JAPhillipsGA(at)aol.com
Guest

Posted: Thu Apr 20, 2006 8:16 am Post subject: More 701 brakes

Zed, I have the plastic tube brake lines on my XL. If I was building again I 

would not install it and here is why. When I vigorously apply bakes I am 

getting hard pressure, but the plane does not slow as readily as I believe it 

should. I think (without any real proof) that some of the pressure is dissipated by 

the general expansion of 14/17 feet of plastic lines and in effect reducing 

that to the brake calibers. I fly and land my plane, but I have missed more 

than a few turn offs because I simply rolled past them. And I am not happy about 

short airports. If I was building or if I ever have to rebuild ( pray Lord I 

never have to ) I would install steel lines. FWIW, Best regards, Bill of 

Georgia

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planejim(at)bellsouth.net
Guest

Posted: Thu Apr 20, 2006 9:42 am Post subject: More 701 brakes

Bill and List,



If your replace the "plastic" brake line use 5052 aluminun not steel. That's 

what I put on my Midget Mustang I, 35 years ago, using Cleaveland brakes. 

Those would put the Mustang on it's nose if you weren't carefull. I don't 

think there is pressure loss at the brakes due to expansion or flexing of 

the "plastic" line on our Zeniths. Rather I think it's just too small brake 

pads on the Matco brakes, but I could be Wrong AGAIN! I'm replacing the pads 

now on my 601HD after 500 hrs (over 700 landings). They sure are small. They 

won't hold the plane still when checking ignition at 3850 RPM of my 80HP 

Rotax eng. I agree with Bill that unless I really slow down on final and 

make a nice very slow touchdown I roll past some turn-offs. All the more 

reason to make nice slow controlled landings!



do not archive



Jim Hoak

---

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cffd(at)pgrb.com
Guest

Posted: Thu Apr 20, 2006 10:44 am Post subject: More 701 brakes

The geometry of the ZAC brakes is such that you don't get good mechanical

advantage.  A lot has been said about this in the past.  If you are not

"bottoming out" the master cylinder you are not losing braking power due to

expansion of brake lines.

Chuck D.

N701TX

---

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randy(at)shadycreekoutlaw
Guest

Posted: Thu Apr 20, 2006 11:11 am Post subject: More 701 brakes

Seems logical to me...  Since a liquid cannot be compressed, at some point 

the lines would quit expanding and would either burst or apply more force to 

the brake pads...  As long as you have not "bottomed out" the master 

cylinder yet...



Randy B.

N344RB



---

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doug kandle

Joined: 09 Jan 2006
Posts: 33
Location: Boise ID

Posted: Thu Apr 20, 2006 11:57 am Post subject: More 701 brakes

I found out that if you don't break in the pads as the instructions 

state, they don't work very well.  When I break in a new set of 

linings I taxi 2 or 3 thousand feet with the brakes on.  They get hot 

and I see sparks coming off of the disks.  But after they cool, they 

work much better.

---

  When I vigorously apply bakes I

 	  Quote: 	
		   >> > am

 >> > getting hard pressure, but the plane does not slow as readily as I

 > believe

 >> > it

 >> > should. I think (without any real proof) that some of the pressure is

 >> > dissipated by

 >> > the general expansion of 14/17 feet of plastic lines and in effect

 >> > reducing

 >> > that to the brake calibers.

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lllanducci(at)tds.net
Guest

Posted: Fri Apr 21, 2006 5:29 am Post subject: More 701 brakes

As Doug Kandle eluded to, proper break-in of the brakes is essential. I 

have an 801 and even at gross weight with Zenith-supplied plastic brake 

lines I have no trouble stopping. Before the break-in I could not keep 

the plane from creeping forward during 1900 rpm mag tests. The 

polypropylene lines supplied by Zenith are very hard, unlike many other 

plastic types. Another potential problem leading to insufficient 

braking is the presence of some air in the brake lines.



Larry Landucci -- N801LL

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