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Drove my car nine miles yesterday with a new master cylinder (marked TRW but who knows these days where it came from) and the brakes locked up. Seems the expansion of the silicon fluid is more then the DOT 3 polyglycol. Back in May of 2003 in the <span style="font-style: italic">Healey Marque Magazine</span> there was an article about this problem, in five pages the author decribed a fix to the original mc by machining .062 off the back side of the pusher piece. I did this & the shop threw my parts away & installed this TRW mc which has completeely different internals. Anybody have any experience machining the internals of a TRW mc?
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BN1 using silicon brake fluid
- Thread starter whitworth
- Start date
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Randy Forbes
Yoda
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And using DOT 3 or 4 fluid wouldn't be easier?
I must've missed that issue, as this is the first time I've heard of silicone fluid expanding enough to pressurize the system.
I hope you get it sorted out, but if it were me, I'd revert back to what type of hydraulic fluid the car was born with.
I must've missed that issue, as this is the first time I've heard of silicone fluid expanding enough to pressurize the system.
I hope you get it sorted out, but if it were me, I'd revert back to what type of hydraulic fluid the car was born with.
Randy Forbes
Yoda
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It's well known here that I'm not a fan of silicone (neither boobs, nor brakes :wink: ) but even I wouldn't put the blame for this on the fluid alone.
Since I haven't read that article, I don't know what the basis for modifying the master cylinder would be, but it seems like the pushrod travel isn't optimum, and that's where I'd start looking.
Since I haven't read that article, I don't know what the basis for modifying the master cylinder would be, but it seems like the pushrod travel isn't optimum, and that's where I'd start looking.
Superwrench
Jedi Trainee
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That is true. Military is going to stop using it. I think the environmentalists got us on that one too. We can all buy a couple of bottles to last us.
tahoe healey
Yoda
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I had heard that it was due to the layering of fluid vs O2 when hot and agitated. Became undependable.
Back to the original problem, the free play needs to be adjusted back just a bit. Brake parts will heat up under use and will expand (not the fluid) requiring an adjustment of the free play on the side of the road a couple of times 'till you get it just right. Once you find that "just right" setting, youll be fine for years, and that's with slicone fluid.