[Healeys] 100 front brakes

Sun Feb 26 11:56:06 MST 2023

DON'T MEAN TO BE VAGUE-OLD AGE. THERE IS A LOT ON THE WEB ABOUT
HYDRAULIC FITTINGS AND I SHOULD HAVE BEEN MORE SPECIFIC-ITS ANF
(American National Fine) but the AF(SB: AN) relates the hose sizes to
SAE dimensions. The point I was trying to make is that there were two
different fittings, and they are not compatible or interchangeable due
to thread pitch and spacing. Hopes this helps clarify early
hydraulics. Hank

AN THREAD SIZES

AN fittings range in size from -2 (dash two) to -32 in irregular steps
that each equates to the outer diameter of the tubing. The outer
diameter of the tube or hose that each fitting is to be used for is
correlated with the inner diameter of the fitting itself.The table
below lists the size specifications of AN fittings ranging from
dash-two to dash-thirty-two, along with the corresponding SAE thread
sizes.

	-----------------------------------------From: "Michael Salter" 
To: "Hank Leach"
Cc: "healeys at autox.team.net"
Sent: Saturday February 25 2023 9:49:03PM
Subject: Re: [Healeys] 100 front brakes

  It's a bit more complicated than that. There is actually no such
thread as an AF thread. AF refers to Across the Flats and is
measurement across the hexagonal nut and denotes the spanner (wrench)
size.  i.e. a 5/16" UNF bolt is 1/2" AF. There was a change made in
the name of the thread form early in BN1 production from SAE (Society
of Automotive Engineers) some say (Standard American Engineers but are
wrong) to UNF (Unified National Fine). SAE actually refers to the
"Family" of threads which includes UNC and UNF. These threads have a
thread angle of 60 degrees. The "F" and "C" refer to the pitch or
threads per inch. For the most part the threads used on the brake
lines of Healeys are 3/8" x 24. 3/8" diameter and 24 threads per inch.
 Whitworth refers to a different and older "family " of threads which
have a 55 degree thread angle.  I should mention that there were also
some differences in the shapes used at the bases and peaks of these
different thread forms which Google can help you with if you haven't
already fallen asleep. Hope that doesn't serve to further muddy the
waters. 
 M  
 On Sun., Feb. 26, 2023, 3:26 p.m. Hank Leach via Healeys,  wrote:
  Gary- The note about the type of thread used was what I was
referring to-mentioned earlier. The early BN1 used AF type
threads.(equivalent to a 1949 Chevrolet). All the later cars (and I do
not know where the changeover was-maybe Michael does) had unified
Girling threads. The lines should thread easily or else you have a
different thread count and pitch. I don't think you will find the
early type hoses from any supplier. They will have to be special made
or found in NOS. Hank

	----------------------------------------- From: warthodson at aol.com
 To: "gradea1 at charter.net"
 Cc: "healeys at autox.team.net"
 Sent: Saturday February 25 2023 1:24:04PM
 Subject: Re: [Healeys] 100 front brakes

 This car is a BN1. Yes, I was referring to the brake wheel cylinders
or slave cylinders as opposed to the master cylinder. What are you
referring to when you say "Be sure that you were supplied the correct
threaded hose...most suppliers do not have the early style." How do I
identify an early style hose from a latter style hose?
 Gary Hodson

 -----Original Message-----
 From: Hank Leach 
 To: 'warthodson at aol.com' 
 Cc: 'healeys at autox.team.net' 
 Sent: Sat, Feb 25, 2023 12:59 pm
 Subject: RE: [Healeys] 100 front brakes

  Do you mean "wheel" cylinders and not "slave"...100s have a
mechanical clutch. I understand that on all model Healeys the brake
hoses have one threaded end and one flared end. That flare goes into
the metal line nut. 
 On the early 100 wheel cylinders they used an American AF thread but
switched over to the Girling unified thread on later releases. The
bleeder connection can be either in or out in shape (photo) but if the
bleed screw is flat it uses the check ball (supplied in rebuild kits)
and fits the recessed shape. The pointed bleeder uses no check ball.
Be sure that you were supplied the correct threaded hose...most
suppliers do not have the early style. Use Girling red grease on the
threads. Hank

  ----------------------------------------- From: "warthodson--- via
Healeys"
 To: "healeys at autox.team.net"
 Cc:
 Sent: Friday February 24 2023 5:15:16PM
 Subject: [Healeys] 100 front brakes

  I will be assisting a friend to replace the flexible hoses on his
100 front brakes. He has ordered and received a set of hoses, but the
ends that thread into the slave Cyl do not match the shape of the
mating surface in the slave. The ends of the hoses are flat & it is my
understanding that the cyl. is cone shaped inside. The vender says
this is not a problem. I think it is a problem. What do you say? 
Also, if it is an issue, where can we get a set of flex hoses that
have the correct ends for this application & are also the correct
length (I.E. Not too short)? Gary Hodson
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