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MG MGA - new master cylinder & DOT5

I purchased a new master cylinder made by TRW. They do not recommend using DOT5 brake fluid, apparently having concerns about piston seal compatability. Has anyone else had a problem with this, can I replace whatever TRW used with Lockheed seals or....?
Thanks, George.
G Goeppner

George ,

I use Dot5 in my MGA for more than 25 years now and I never have any problems of any kinds . In 80's the cost for Dot5 was very high , now it's more reasonable and it's really a good thing for my car .It doesn't affect the paint etc...

For me , it's the best , but it's only my opinion .

Jules .
MGA 1600MKII 1962

jdesb@videotron.ca
Jules Desbiens

When I had my Master Cylinder rebuilt I got a very disturbing note in the box when it was returned to me claiming same thing . Not to use Dot 5. I called the company and told them I will use nothing else but Dot 5 , they said as long as I use the DOT5 that Moss sells the seals should be fine , but they had other bad reports with other Dot 5 fluids
Chris Velardi

The general belief is that those warning notes are simply to cover themselves against people mixing fluids.
Steve S

Hi George. I have used DOT5 fluid in My MGA 1500 roadster for over 20 years, and have had excellent results. The DOT 5 actually PRESERVES rubber seals and makes them last considerably longer than when using regular fluid. Additionally Dot 5 fluid doesnt eat pait like regular brake fluid! I highly recommend using DOT 5 fluid. Hope this helps, Glenn
Glenn Hedrich

Thanks for the comments guys. I had already decided on using DOT5, my entire brake system will be new as part of the restoration. I don't want to re-open the debate of DOT4 vs DOT5, I was trying to understand why TRW does not recommend the use of DOT5. Like Chris said, I plan to use it anyway...

George

G Goeppner

I have also used DOT5 for over twenty years and have been very happy with the results. A couple of things to keep in mind though. DOT5 does not mix with other fluid types so the best time to start with it is when you have rebuilding the entire system. Old fluid in brake lines or hoses, not to mention wheel cylinders, can cause problems. Also, even though this fluid does not absorb water you should still bleed your system once a year as condensation can cause water to collect in the low parts of the braking system.
Keith Lowman

This thread was discussed between 15/12/2009 and 18/12/2009

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