Slave cylinder rubber seal sizes.

jeremy4cam

jeremy4cam

Joined
Jan 6, 2025
Messages
3
Age
61
Location
British Columbia Canada
Bike
2007 ST1300
Has anyone messured the rubber seal sizes for the ST1300 Slave cylinder ? Is there another Honda Slave cylinder that shares the same size rubber seals ? Looking to clean and replace the seals without buying a whole complete unit. I'm seeing rubber seals on Aliexpress and Amizon but no sizes OR listings to fit a ST1300. Many other big Honda bikes are listed for these seal kits. I'm thinking a VTX or Goldwing, even the ST1100 must all use the same seals for the Slave cylinder. Thanks for any info to get this done .
 
jeremy4cam said:
Has anyone messured the rubber seal sizes for the ST1300 Slave cylinder ? Is there another Honda Slave cylinder that shares the same size rubber seals ? Looking to clean and replace the seals without buying a whole complete unit. I'm seeing rubber seals on Aliexpress and Amizon but no sizes OR listings to fit a ST1300. Many other big Honda bikes are listed for these seal kits. I'm thinking a VTX or Goldwing, even the ST1100 must all use the same seals for the Slave cylinder. Thanks for any info to get this done .
Click to expand...
Which model ? Front calipers changed in 2008. And often the outer pistons are different from the centre

Or do you mean the clutch slave ?
 
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Front Left caliper - All pistons are 22mm diameter - all seals are the same : 06451MZ2405

Front Right Caliper - Outer Pistons are 27mm diameter - Seals are 06431MA3405
Front Right Caliper - Centre Piston is 22mm diameter - Seals are 06451MZ2405

I just checked the 2006 and 2009 models - the pistons and seals are the same on the 2006 model and on the 2009 model. (After 2008 the front calipers changed significantly)
I don't have any seal sets to measure inside/outside diameter or thickness

The clutch slave seal (called the cup on the fiche) is 22865MJ8003
It is listed as part of the Rear Crankcase Cover

Some sites show you which bike the identical honda part is also used on. Those part numbers may help. eg - I just found a listing that suggests the same part is used on the CBR1100XX VFR800 and VTR1000
You'd have to verify that for yourself. You know what AI results can be like - ie wrong !
 
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jfheath said:
Front Left caliper - All pistons are 22mm diameter - all seals are the same : 06451MZ2405

Front Right Caliper - Outer Pistons are 27mm diameter - Seals are 06431MA3405
Front Right Caliper - Centre Piston is 22mm diameter - Seals are 06451MZ2405

I just checked the 2006 and 2009 models - the pistons and seals are the same on the 2006 model and on the 2009 model. (After 2008 the front calipers changed significantly)
I don't have any seal sets to measure inside/outside diameter or thickness

The clutch slave seal (called the cup on the fiche) is 22865MJ8003
It is listed as part of the Rear Crankcase Cover

Some sites show you which bike the identical honda part is also used on. Those part numbers may help. eg - I just found a listing that suggests the same part is used on the CBR1100XX VFR800 and VTR1000
You'd have to verify that for yourself. You know what AI results can be like - ie wrong !
Click to expand...
Great info you have jfheath, I did replace the 14 mm seals in my secondary master cylinder at the left front brake. Now I plan on replacing/cleaning the Clutch Slave cylinder. You have the brake seal sizes correct as I just cleaned and replaced all those seals. I recommend anyone to do this seal replacement as your ST bike gets older. Flushing the fluid is great, but when you open up these parts you will find lots of ugly junk. I used a Ultrasonic tank to clean. Thanks again jfheath, safe rides to you .
 
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