Welcome to our resource for MG Car Information.
MG TD TF 1500 - Leaky Brake Master Cylinder
|I recently discovered that my brass sleeved master cylinder was leaking its DOT 3 fluid. The bore seems smooth and the internal rubber parts seem to be in excellent condition. Less than a thousand miles on it but about eight years on the car. I suspect that the fluid is leaking between the sleeve and the casting. Maybe from the two holes for the fluid passage or maybe at the far end.|
Anyone have any experience with this and know what to look for to confirm my suspicions? Any fix?
|The rubber parts aren't swollen from DOT 3? They must be making them out of better stuff than any I've had. Or your DOT 3 was better than any I've tried (longer than 8 years ago).|
Sorry I don't have a good answer, but 8 years is longer than I've ever been able to keep a hydraulic system buttoned up with DOT 4.
Hmm, now that I think about it, maybe I am using DOT 4 fluid. I used all the fluid in the can to flush all the old fluid and pitched the can so I can't check it. I mentioned DOT 3 to confirm that I am not using Silicone fluid.
|I had the same problem with a brass-sleeved MC. I eventually gave up and bought an new master cylinder.|
It was leaking between the sleeve and the casting. I used DOT 4 liquid, and I rebuilt the damn thing 4 times before I pulled off the accordion seal on the outside and bench tested it. It became pretty obvious that there was enough of a gap between the sleeve and casting by the fluid and bubbles weeping out between the brass sleeve and cast iron cylinder.
FWIW, Apple Hydraulics sleeved the MC.
|Thanks for the comment Mark. Phil Marino out in CA did mine. Maybe that's a chronic problem with sleeving a cylinder. Or could it be the DOT 4 eating up whatever sealant was used between the sleeve and the casting?|
This thread was discussed between 07/08/2006 and 09/08/2006
MG TD TF 1500 index
This thread is from the archive. The Live MG TD TF 1500 BBS is active now.