2500M: brake master cylinder honing?
Discussion
Guys, have any had any success honing a master cylinder?
My understanding is that honing could correct some light pitting/scoring inside. (much more and it won't work?)
(my master cylinder appears to have a slight leak, and I'm wondering if a rebuild, with honing, might be enough to deal with it - as opposed to resleeving it or replacing it).
Ron
My understanding is that honing could correct some light pitting/scoring inside. (much more and it won't work?)
(my master cylinder appears to have a slight leak, and I'm wondering if a rebuild, with honing, might be enough to deal with it - as opposed to resleeving it or replacing it).
Ron
If your MC is leaking slightly, you might get away with new seals - the seals do harden and wear over time, and can then leak. If the bore is worn or pitted though, you are probably better off buying a new one.
Even new seals aren't guaranteed to fix a leak, it just depends on the wear.
I've had sucess and failure on leaky cylinders, sometimes new seals work, sometimes they don't.
Even new seals aren't guaranteed to fix a leak, it just depends on the wear.
I've had sucess and failure on leaky cylinders, sometimes new seals work, sometimes they don't.
RCK974X said:
If your MC is leaking slightly, you might get away with new seals - the seals do harden and wear over time, and can then leak. If the bore is worn or pitted though, you are probably better off buying a new one.
Even new seals aren't guaranteed to fix a leak, it just depends on the wear.
I've had sucess and failure on leaky cylinders, sometimes new seals work, sometimes they don't.
From The Advice i have heard Even new seals aren't guaranteed to fix a leak, it just depends on the wear.
I've had sucess and failure on leaky cylinders, sometimes new seals work, sometimes they don't.
If you cant get a new one get it stainless Sleeved
A
prideaux said:
From The Advice i have heard If you cant get a new one get it stainless Sleeved A
Yes, I know owners who have done this on older classics, and the only risk appears to be that the MC casting can crack/break when being bored out for the sleeve, some types are more prone because they have thinner castings.I know Vixen S3 is a TR6 MC and servo, which are still available - is 2500 M the same ? At least some of the M's are, from the photos I've seen....
Renaldo said:
D, yep, clutch system converted to DOT 5.
Brake hydraulics not done yet(ouch)and looks like I've developed a leak, although from where is a bit unclear.
So it'll be DOT 5 for the brakes too. Once I figure out exactly what is leaking and what needs fixing.
Ron
Please do the lot. New master, cylinders and rebuild the calipers with SS pots, blow out the hard lines with air and be done. You will be a happy man.Brake hydraulics not done yet(ouch)and looks like I've developed a leak, although from where is a bit unclear.
So it'll be DOT 5 for the brakes too. Once I figure out exactly what is leaking and what needs fixing.
Ron
Best,
D.
Guys, just to satisfy my own curiousity about how things work and taking things apart, I picked up a used brake master for my car. Got it cheap. Never intended to use it on the car.
Upon dismantling it (which was easy peasey)I inspected the bore, which looked remarkably good. No pitting or scratching that I could see under light (although getting light all the way to the back isn't easy).
I bought a brake hone, for $8 Canadian, and ran it through. Bore looked even better. Cleaned up very nicely.
With one major but: after cleaning it up, I noticed a scratch, about 1/4" long, about 1/2" into the bore from the plunger hole.
The scratch barely registers when passing a finger tip over it, but a few passes and you can just feel it.
Throw the whole thing in the bin? Or is it only savable by sleeving it? (my understand is that sleeving costs more than a new master)
Upon dismantling it (which was easy peasey)I inspected the bore, which looked remarkably good. No pitting or scratching that I could see under light (although getting light all the way to the back isn't easy).
I bought a brake hone, for $8 Canadian, and ran it through. Bore looked even better. Cleaned up very nicely.
With one major but: after cleaning it up, I noticed a scratch, about 1/4" long, about 1/2" into the bore from the plunger hole.
The scratch barely registers when passing a finger tip over it, but a few passes and you can just feel it.
Throw the whole thing in the bin? Or is it only savable by sleeving it? (my understand is that sleeving costs more than a new master)
Grantura MKI said:
Please sleeve it and be done.....it will soon be snowing and your driving days are running out quickly.
Best,
D.
Well done good purchase now get it sleeved as David says and while its being done you can still use the car and then fit i presume the old one is still on the car Best,
D.
A
Just for the sake of discussion on Mike's point, the scratch is not length wise on the bore but on an "arc" around it.
I think it's likely right at the end of the piston's travel, so it probably lines up with the rubber o ring on the piston, although it's tough to be exact.
I priced sleeving, and it's about $150 U.S.
New master is maybe a little less...
And by the way boys, please don't mention snow.
I'd rather not think about it! Give me Palm Springs!
Ron
I think it's likely right at the end of the piston's travel, so it probably lines up with the rubber o ring on the piston, although it's tough to be exact.
I priced sleeving, and it's about $150 U.S.
New master is maybe a little less...
And by the way boys, please don't mention snow.
I'd rather not think about it! Give me Palm Springs!
Ron
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