[Roadsters] Right rear brake cylinder leak

[Gary and Cindy Ault]

Dave,

I keep a reasonably complete set of both metric and SAE wrenches in my
box.  I have encountered a number of situations working on roadsters, almost
exclusively low-windshield cars, where the wrench which is supposed to fit
won't, but it's metric companion or vice-versa, will.  Also, had to carefully
file down the flats on a couple of brake line fittings, and use metric when
the SAE fittings were corroded.  Never regretted having spent the money on
both.

Gary


________________________________
 From: D Riedel
<stamuki at gmail.com>
To: Stan Chernoff <az589 at lafn.org> 
Cc: Gary and Cindy
Ault <aultgc at att.net>; "datsun-roadsters at autox.team.net"
<datsun-roadsters at autox.team.net> 
Sent: Friday, July 11, 2014 1:18 PM
Subject: Re: [Roadsters] Right rear brake cylinder leak
 


Thanks fellas,
good advice.  I'll grab a cylinder from Ross once I confirm that's the
problem, see below.

That's interesting about the metric/SAE wrench issue.  I
thought they were SAE - I have a 3/8 + 7/16 combo line wrench which I bought
to work on the Roadster... I've used it on the clutch slave, certainly.
 Somehow, it really didn't seem to fit, so I grabbed a 10mm/11mm.

11mm =
0.4331"
7/16 =    0.4375"

Not sure how I'd fail to get the slightly larger
7/16" on there... maybe it's because I was lying upside down on the driveway
with my head under a car at 8:30 at night?

Meanwhile, having popped the drum
off, everything inside looks good.  Shoes are ~new, which is nice, and there's
no brake fluid in there.  The cylinder doesn't really seem to be losing fluid
- not from that side, anyway.  I've flushed and bled that corner and topped-up
the M/C and haven't lost any fluid since.  Mysterious?

-dave




On Tue, Jul
8, 2014 at 6:33 PM, Stan Chernoff <az589 at lafn.org> wrote:

Dave,
>
>The hex
dimension on the tube fitting for the rear brake cylinder is 7/16" .  While
11mm is close to 7/16" you would waste your money if you purchased metric
tubing wrenches to work on a Datsun roadster since all of the brake tubing
fittings are SAE.
>
>Stan
>////////////
>
>
>At 05:52 PM 7/8/2014, Gary and
Cindy Ault wrote:
>
>Dave,
>>
>>Although Graeme's advice is always well
thought-out, and you can't go
>>wrong with new cylinders, if you have the
additional time, I'd take the
>>leaking cylinder apart, and check the bore.
 If it is smooth (not pitted) and
>>the piston is not corroded, I'd use a
repair kit, and I have done so
>>successfully.
>>
>>As to the size of the
nuts, do yourself a favor and buy a set
>>of metric flare nut wrenches:  9 x
11 and 10 x 12, or the equivalent.  They
>>grip the nuts on nearly all sides,
don't slip, and one of those sizes will fit
>>the nuts.  My guess is 10mm.  (I
have both metric and SAE flare nut wrenches
>>in my box.)
>>
>>Gary
>>
>>________________________________
>> From: D Riedel
>><stamuki at gmail.com>
>>To: datsun-roadsters at autox.team.net
>>Sent: Monday, July 7,
>>2014 3:57 PM
>>Subject: [Roadsters] Right rear brake cylinder leak
>>
>>
>>Looks like
>>my
right rear cylinder is leaking.  A quick confirmation,
>>please:  are the
>>nuts on the brake lines for a '69 2000 10mm?
>>
>>Also, what are my options
here
>>and which is(are) preferred?  New cylinder?
>>Rebuild kit?  Alternative
>>cylinder?
>>
>>Thanks everyone...
>>
>>--
>>Dave Riedel
>>'69 2000
>>Victoria, BC
>>
>>
>>
>>
>>________________________________________
>>
>
>
>
-- 
Dave Riedel
'69 2000
Victoria, BC