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Brake problems
Posted: Mon Apr 22, 2002 11:57 am
by yusynth
Good morning All:
About a year ago, because of a rust problem I changed brake fluid from
conventional to silicone.
I purged the system twice using the silicone fluid and then again about 6
months ago I purged a third time.
Recently I've had considerable trouble stopping. Upon, removing the drums I
found the rubber cups in the wheel cylinders stuck in the bores. I have not
had the master cylinder off, maybe its all swelled up too.
Has anyone had experience with silicone fluid?
Did it attack the rubber cups?
I'd hate to go back to the old Dot 4 stuff.
Any suggestions?
Many thanks.
Earl Nowicke
TC49EXU@aol.com
Re: Brake problems
Posted: Mon Apr 22, 2002 12:14 pm
by Gene Gillam
Eric asks:
>Has anyone had experience with silicone fluid?Did it attack the rubber cups?
Eric,
When I rebuilt my brake system I used new lines and rebuilt all my brake cylinders as well as totally removing my master cylinder and cleaning all traces of fluid from it before adding new silicone fluid to the system. This was about 7 years ago. My chassis sat like that for about 4 more years before I got the car finished. My brakes are still like new and the silicone fluid hasn't caused any break down in the rubber components at all.
The only thing I can think of was your system wasn't totally purged of the old fluid.
Gene Gillam
1949 MG TC
Saucier, MS
Re: Brake problems
Posted: Mon Apr 22, 2002 1:28 pm
by Frank O_ The Mountain
In a message dated 4/22/02 12:01:51 Pacific Daylight Time,
TC49EXU@aol.com
writes:
>
Earl, a lot of us have used Silicone for years and years with no
problems........some do have problems.......this is a subject that is very
much antenodal. If you didn't change all your rubbers when you put silicone
in the system......then that is most likely your problem. Replace all rubber
components in your system with new, not NOS, Go to Napa and get the
cups....they also have silicone brake fluid. Take .050 off your M/C piston
and then refill and bleed.......you should then be able to let the good times
roll........
Terry
Re: Brake problems
Posted: Mon Apr 22, 2002 4:41 pm
by Ray
Sounds as if all the old stuff didn't make it out the bleed nipples.....
Best,
Ray
----- Original Message -----
From: TC49EXU@aol.com>
To: mg-tabc@yahoogroups.com>
Sent: Monday, April 22, 2002 1:57 PM
Subject: [mg-tabc] Brake problems
> Good morning All:
> About a year ago, because of a rust problem I changed brake fluid from
> conventional to silicone.
> I purged the system twice using the silicone fluid and then again about 6
> months ago I purged a third time.
> Recently I've had considerable trouble stopping. Upon, removing the drums
I
> found the rubber cups in the wheel cylinders stuck in the bores. I have
not
> had the master cylinder off, maybe its all swelled up too.
> Has anyone had experience with silicone fluid?
> Did it attack the rubber cups?
> I'd hate to go back to the old Dot 4 stuff.
> Any suggestions?
> Many thanks.
> Earl Nowicke
>
TC49EXU@aol.com
>
>
>
> Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
>
>
Re: Brake problems
Posted: Mon Apr 22, 2002 8:33 pm
by Donald Wilkinson
Hey Terry:
Whut's "antenodal", huh?
Don
TC 7993
>From:
taterry@aol.com
>To:
TC49EXU@aol.com,
mg-tabc@yahoogroups.com
>Subject: Re: [mg-tabc] Brake problems
>Date: Mon, 22 Apr 2002 16:28:20 EDT
>
>In a message dated 4/22/02 12:01:51 Pacific Daylight Time,
TC49EXU@aol.com
>writes:
>
> Did it attack the rubber cups?
> I'd hate to go back to the old Dot 4 stuff.
> Any suggestions? >>
>
>Earl, a lot of us have used Silicone for years and years with no
>problems........some do have problems.......this is a subject that is very
>much antenodal. If you didn't change all your rubbers when you put
>silicone
>in the system......then that is most likely your problem. Replace all
>rubber
>components in your system with new, not NOS, Go to Napa and get the
>cups....they also have silicone brake fluid. Take .050 off your M/C piston
>and then refill and bleed.......you should then be able to let the good
>times
>roll........
>Terry
>
>
>
>Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
>
>
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Re: Brake problems
Posted: Mon Apr 22, 2002 8:56 pm
by AJChalmers@aol.com
Terry's from Looosiana, so you got to cut him some slack.
Re: Brake problems
Posted: Mon Apr 22, 2002 9:28 pm
by Donald Wilkinson
Oh, OK, dint know that; he straitened me out anyway.
Don
TC7993
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Fwd: [mg-tabc] Brake problems
Posted: Tue Apr 23, 2002 2:12 am
by GRaw505@aol.com
Re: Brake problems
Posted: Tue Apr 23, 2002 2:31 am
by Dave & Diana Dwyer
Earl
Some years ago I rebuilt a system using NOS cylinders, new hoses and silicon
fluid.
After about 12 months I noticed some brake drag (several seconds on my lap
times!). When I stripped the brakes, everything was sparkling clean - I'd
never experienced #that# with ordinary brake fluid - but the primary cup in
the master cylinder had swelled as if perished, and was blocking the bleed
hole into the reservoir, causing the brake not to fully release.
I put it all back together with a new kit in the master cylinder and it's
been fine ever since - about 12 or 13 years.
I'd had all the bits on #my# shelf for some years, so maybe the cup simply
was perished.
Make sure that you thoroughly clean the parts before assembly so there is
only silicon fluid present: I've found that the lubricant in new brake
cylinders is not compatible with silicon fluid.
In summary, I'm totally satisfied with silicon fluid and I wouldn't dream of
changing back.
Regards
Dave Dwyer
J2, TA, TC
Brake problems
Posted: Sat Aug 19, 2006 3:38 am
by banjomey2@aol.com
Hi Peter,
looks like you solved my brake-problems with your advice to check the piston
of the MC. I took the MC out agian (bought from Moss Europe), checked the
piston on compared it with the piston of the old MC. The new piston is about 2mm
longer than the one of the old unit and will block the relief hole.
I haven't put everything together yet but I am quite shure my brake-problems
might be solved.
Thanks again
Peter "Banjo" Meyer
TC 9027, 1949
Morgan +4, 1965
TR 3A, 1959
Rilye TT Sprite Special, 1935
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