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General Category => Maintenance => Topic started by: great white on March 02, 2019, 01:05:19 PM



Title: Ugh, clutch slave again.
Post by: great white on March 02, 2019, 01:05:19 PM
My clutch slave dumped it's guts a while ago.

Tore it down, seals looked reasonably sound but the bore and piston looked pretty pitted.

Cleaned it all up and put it back together. Went just over a week with no leaks.

Today, when fitting he slave back on the cover (after repainting the cover) I noticed a drop of fluid on my finger.

Yup, leaking a gain.

 :Facepalm:

So now I'm trying to decide between trying new seals and another round of scotchbrite or just replacing the slave.

Big price difference between each option.....


Title: Re: Ugh, clutch slave again.
Post by: red on March 02, 2019, 01:28:39 PM
My clutch slave dumped it's guts a while ago.  Tore it down, seals looked reasonably sound but the bore and piston looked pretty pitted. Yup, leaking a gain. So now I'm trying to decide between trying new seals and another round of scotchbrite or just replacing the slave.  Big price difference between each option.....
great white,

US$145.00 from RPM . . . vs. your time and trouble, plus brake fluid damages both paint AND plastics, if ignored.  To me, it would be all new stuff there, no contest.

FYI, brake fluid can absorb moisture, which causes that pitting (rust) which you found.  Flush and bleed the hydraulics on a regular basis, and more frequently in high humidity places, to avoid most metal damage like that.  Fresh fluids are a real safety issue on the brakes, because the moisture can boil out and lock a brake caliper/disk in flight.


Title: Re: Ugh, clutch slave again.
Post by: FJmonkey on March 02, 2019, 01:51:20 PM
The original lasted 20-30 years, why mess with another failure? Get a new one and spend more time riding it.


Title: Re: Ugh, clutch slave again.
Post by: T Legg on March 02, 2019, 02:48:44 PM
When you rebuild or replace your slave cylinder switch to dot 5 fluid and save yourself from future paint damage.


Title: Re: Ugh, clutch slave again.
Post by: Pat Conlon on March 02, 2019, 03:01:03 PM
SS Sleeve your slave : http://www.fjowners.com/index.php?topic=12294.0 (http://www.fjowners.com/index.php?topic=12294.0)


Title: Re: Ugh, clutch slave again.
Post by: CutterBill on March 02, 2019, 05:07:37 PM
When you rebuild or replace your slave cylinder switch to dot 5 fluid and save yourself from future paint damage.
This. ^


Title: Re: Ugh, clutch slave again.
Post by: great white on March 02, 2019, 05:09:08 PM
SS Sleeve your slave : [url]http://www.fjowners.com/index.php?topic=12294.0[/url] ([url]http://www.fjowners.com/index.php?topic=12294.0[/url])

Now thats a good idea!

Might be my next lathe project...;)


Title: Re: Ugh, clutch slave again.
Post by: great white on March 02, 2019, 06:18:38 PM
My clutch slave dumped it's guts a while ago.  Tore it down, seals looked reasonably sound but the bore and piston looked pretty pitted. Yup, leaking a gain. So now I'm trying to decide between trying new seals and another round of scotchbrite or just replacing the slave.  Big price difference between each option.....
great white,

US$145.00 from RPM . . . vs. your time and trouble, plus brake fluid damages both paint AND plastics, if ignored.  To me, it would be all new stuff there, no contest.

FYI, brake fluid can absorb moisture, which causes that pitting (rust) which you found.  Flush and bleed the hydraulics on a regular basis, and more frequently in high humidity places, to avoid most metal damage like that.  Fresh fluids are a real safety issue on the brakes, because the moisture can boil out and lock a brake caliper/disk in flight.
. That’s over 200 after shipping, exchange, duties and taxes....


Title: Re: Ugh, clutch slave again.
Post by: ribbert on March 02, 2019, 06:50:04 PM
SS Sleeve your slave : [url]http://www.fjowners.com/index.php?topic=12294.0[/url] ([url]http://www.fjowners.com/index.php?topic=12294.0[/url])

Now thats a good idea!

Might be my next lathe project...;)



If you are equipped to do it yourself, as you appear to be, it's a great idea. Once a common practice done by all brake shops, when labour was cheaper than parts, it is a service they no longer provide, making it a machine shop job. I enquired recently for some parts that are no longer available.

The FJ slaves seem good for one hone /new seal and that's it. They will start to leak if left unused or when the fluid gets old or both. Mine has been brought back to life many times with new fluid and regular use, it is the original with 220k on it and has had one replacement seal, however I think it's time has come. Exchange rate and freight really knock us around down here, I doubt there'd be much change out of $250 so I'll be getting a price to line it before buying a new one.

Noel


Title: Re: Ugh, clutch slave again.
Post by: ribbert on March 02, 2019, 06:53:27 PM
When you rebuild or replace your slave cylinder switch to dot 5 fluid and save yourself from future paint damage.

How many times do you plan on it leaking?  :biggrin:

This should be a once in the life of the bike job.

Noel


Title: Re: Ugh, clutch slave again.
Post by: ribbert on March 11, 2019, 03:28:04 AM
SS Sleeve your slave : [url]http://www.fjowners.com/index.php?topic=12294.0[/url] ([url]http://www.fjowners.com/index.php?topic=12294.0[/url])

Now thats a good idea!

Might be my next lathe project...;)



If you are equipped to do it yourself, as you appear to be, it's a great idea. Once a common practice done by all brake shops, when labour was cheaper than parts, it is a service they no longer provide, making it a machine shop job. I enquired recently for some parts that are no longer available.

Noel


While I've been busy doing nothing about my own clutch slave (I removed the belly pan until I fix it and regular use seems to stop it leaking anyway) I removed the master cylinder of a "P" Type MG and returned it to the owner. As it turns out, it was so he could send it away to have a SS liner put in it - $400!!
I suspect there is an element of "specialised" service charge for old cars, in other words, ripping him off because it's a vintage car and therefore expensive to work on. However, it does suggest it's not a commonplace procedure anymore.

When drum brakes and cast iron wheel cylinders were the norm this used to be common practice.

I'll still get a price on getting the FJ slave done from a machine shop, I just won't mention it's rare, old or expensive to replace. :biggrin:

Noel


Title: Re: Ugh, clutch slave again.
Post by: Bones on March 11, 2019, 01:25:35 PM
I bought a brand new slave from Yamaha last year for $210.00, a bit pricy I thought at the time but then thinking if it lasts for 20yrs I’ll never have to worry about it again in my riding lifetime. I had a SS liner put in my 4x4 clutch master about 15 yrs ago but it’s now leaking fluid down the firewall, but a brand new brake master bought at the same time is still going strong.


Title: Re: Ugh, clutch slave again.
Post by: RPM - Robert on March 11, 2019, 02:08:18 PM
I bought a brand new slave from Yamaha last year for $210.00, a bit pricy I thought at the time but then thinking if it lasts for 20yrs I’ll never have to worry about it again in my riding lifetime.

Keep in mind, RPM has brand new slave cylinders for significantly less than that: Slave Cylinder (https://www.rpmracingca.com/proddetail.asp?prod=Clutch%3A5EA-16381-00%3A36y-16381-00)

We use the same mentality when talking about the petcock as an investment of the life of the bike. The cost amortized over all the years of service makes the annual cost much more palatable.


Title: Re: Ugh, clutch slave again.
Post by: Pat Conlon on March 11, 2019, 04:09:57 PM
Keep in mind, RPM has brand new slave cylinders for significantly less than that:

Robert, keep in mind Bonesy’s AU dollars  i.e $210 AU = $148.50 USD


Title: Re: Ugh, clutch slave again.
Post by: RPM - Robert on March 11, 2019, 04:26:22 PM
Keep in mind, RPM has brand new slave cylinders for significantly less than that:

Robert, keep in mind Bonesy’s AU dollars  i.e $210 AU = $148.50 USD

Yep I should have done the conversion... :Facepalm:


Title: Re: Ugh, clutch slave again.
Post by: dongoodjr on July 11, 2019, 08:39:29 AM
My clutch slave dumped it's guts a while ago.

Tore it down, seals looked reasonably sound but the bore and piston looked pretty pitted.

Cleaned it all up and put it back together. Went just over a week with no leaks.

Today, when fitting he slave back on the cover (after repainting the cover) I noticed a drop of fluid on my finger.

Yup, leaking a gain.

 :Facepalm:

So now I'm trying to decide between trying new seals and another round of scotchbrite or just replacing the slave.

Big price difference between each option.....


I gave up on the old worn one after a couple rebuilds, bought a new one, NO issues now.

DG


Title: Re: Ugh, clutch slave again.
Post by: chiz on July 11, 2019, 09:23:02 AM
I went through what you are going through a while back, I messed with it for weeks.... seals etc etc to no avail. I got a used slave off ebay and got lucky still workes fine.


Title: Re: Ugh, clutch slave again.
Post by: RPM - Robert on July 11, 2019, 09:30:39 AM
$100 for 30+ years of service. A bit over $3 a year for a new one.

Rebuild kits $21 last a year or two, $10.50-$21 a year. (Maybe lasts longer)

The math checks out on this one. Best to buy new.