Brake problems

[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

[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

[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

[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/ > >

[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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[AJChalmers@aol.com]

Terry's from Looosiana, so you got to cut him some slack.

[Donald Wilkinson]

Oh, OK, dint know that; he straitened me out anyway. Don TC7993

>From: AJChalmers@aol.com >To: digitaldon@hotmail.com, TATERRY@aol.com, TC49EXU@aol.com, >mg-tabc@yahoogroups.com >Subject: Re: [mg-tabc] Brake problems >Date: Mon, 22 Apr 2002 23:56:17 EDT > >Terry's from Looosiana, so you got to cut him some slack.

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[GRaw505@aol.com]

[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

[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 [Non-text portions of this message have been removed]