[Roadsters] 68 brake calipers - leak

[Gary and Cindy Ault]

Larry,

The master cylinder puts a lot of pressure on the wheel cylinders  when you 
depress the pedal.  You could have a very small cut or tear in the piston 
seal, and not notice it, but have it be sufficient to allow fliud past when 
the brakes are used.  You didn't mention the condition of the cylinders, but 
I presume there are no pits or other irregularities.

Minor pits can be removed by honing, but I don't know how to do that with 
the center pin in the cylinder.  The cylinders can be sleeved, or replaced 
at no small cost.

Gary

----- Original Message ----- 
From: "Larry Dziuba" <roadster68 at shaw.ca>
To: "Datsun Roadster List" <datsun-roadsters at autox.team.net>
Sent: Sunday, March 11, 2012 10:15 PM
Subject: [Roadsters] 68 brake calipers - leak


> Hello Everyone,  There has always been poor performance from my front disc 
> brakes.  I pulled the passenger side and found one pad was wet and would 
> not come out without some force.  It looks like brake fluid saturated it. 
> I could not see any brake lines that were leaking.  I then pulled the 
> piston. It appeared to be wet inside the dust boot.  I could not see any 
> tears or even marks on the seal or any scratches on the cylinder wall.  I 
> did put in brake kits about 5 years ago but have minimal miles on the 
> roadster.  The lines have been bled a number of times over the years. 
> Could the seal leak without a tear.  It looks good.  Puzzled.  PS: the 
> caliper is still thick enough.  Larry.
>
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