[JAGNUTS] Brake Issue

[Ron McLean]

You could put a little piece of plastercyne or soft putty in the break master
cyl and then bolt it to the booster. It will squish the putty out and you will
be left with the clearence. look to see if the putty has been squished out to
far and is showing metal in the master cyl piston where it has touched or to
much putty where it has not squished out enough. There should be a very thin
amount of putty left in the back of the piston, this is so the piston can come
all the way back to the end of the bore to alow the break system to release
all of the break fluid back to the master cyl. resovoir so as to not have the
breaks pump up and stay on.            Ron

> Date: Fri, 4 Jun 2010 15:50:38 -0600
> From: rje.bob at sasktel.net
> To: jagnuts at autox.team.net
> Subject: Re: [JAGNUTS] Brake Issue
>
> Thanks Ron ... but no I have not checked this ... how do you check this?
...
> it is easy enough to pull off the master cylinder and the pin from the
> booster is treaded so I am assuming there is some adjustment ... I didn't
> see anything in the manual as to how to check this either ... any
> suggestions? ... Bob
>
> -----Original Message-----
> From: jagnuts-bounces at autox.team.net
[mailto:jagnuts-bounces at autox.team.net]
> On Behalf Of Ron McLean
> Sent: June 4, 2010 12:35 PM
> To: jagnuts at autox.team.net
> Subject: Re: [JAGNUTS] Brake Issue
>
> Have you checked the clearence between the push rod comming out of the
> booster
> and going into the back piston of the master cyl. Some times rebuilt master
> cyl. may have a new piston that is not exatly like the original. This might
> make the foot pedal travel to far and possibly beyond the boosters usable
> range. Ron
>
> > Date: Fri, 4 Jun 2010 09:41:39 -0600
> > From: rje.bob at sasktel.net
> > To: jagnuts at autox.team.net
> > Subject: [JAGNUTS] Brake Issue
> >
> > I have a bit of a problem and I'm hoping some brake expert (like Mike!)
> out
> > there might be able to help.
> >
> > Over the winter the master cylinder on the XJ6 decided to spring a leak.
> > Bought a new master, replaced old with new, and bled brakes.
> >
> > Now, the pedal travel is now quite long before braking starts, and
> requires
> > more pressure to brake (like I am getting no boost). Brakes don't seem
> > spongy.
> >
> > Last night I pulled the master away from the booster without
disconnecting
> > brake lines, and new master does not seem to have an external leak.
Pulled
> > the vacuum line off the booster (with car shut off) and vacuum was being
> > held, as there was a definite rush of air when the vacuum pipe was
pulled.
> > No leaks at any brake lines or joints that I can see. Flex brake lines
are
> > likely original, but no signs of swelling.
> >
> > Rear brake pads likely will need to be replaced in the not too distant
> > future, but are OK.
> >
> > Any thoughts?
> >
> > Bob
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