My clutch has lost pressure- just sitting in the garage? Why [Archive]

rocketman1

16th July 2019, 21:10

One of my bikes VFR Honda has lost pressure on the hydraulic clutch.
Like it has no fluid ,
It has fluid, and been no problem for the 2 years I have had it.
It has no leaks that I can see.
Reservoir is full. And the bike has not fallen over.

So I bled the clutch fliud out and put new fluid in.
Seems to be now working fine, ie. 3days later it still has good pressure.

Q , Why should it randomly lose pressure?

Katman

17th July 2019, 07:39

One of my bikes VFR Honda has lost pressure on the hydraulic clutch.
Like it has no fluid ,
It has fluid, and been no problem for the 2 years I have had it.
It has no leaks that I can see.
Reservoir is full. And the bike has not fallen over.

So I bled the clutch fliud out and put new fluid in.
Seems to be now working fine, ie. 3days later it still has good pressure.

Q , Why should it randomly lose pressure?

It possibly absorbed some moisture from the atmosphere.

How long was it sitting not being used?

Gremlin

17th July 2019, 18:25

One I had recently was the clutch slave... There isn't much fluid in the system, so you don't have to lose much, and I couldn't see any leaks...

FJRider

17th July 2019, 19:31

I had a similar issue quite a few years back. The issue was at the clutch lever.

F5 Dave

21st July 2019, 10:35

90s Yamahas did this occasionally. I pulled the slave on my YZF and replaced the seal. I cleaned the slave out and gave it a light clean up with fine sandpaper. There was some corrosion at the lowest point. Water gets absorbed and is heavy so sinks. I change fluids but bike was 2nd hand so I was likely the first.

jellywrestler

21st July 2019, 21:07

90s Yamahas did this occasionally. I pulled the slave on my YZF and replaced the seal. I cleaned the slave out and gave it a light clean up with fine sandpaper. There was some corrosion at the lowest point. Water gets absorbed and is heavy so sinks. I change fluids but bike was 2nd hand so I was likely the first.

sandpaper, you brute, haven't you heard of wet and dry?

F5 Dave

22nd July 2019, 12:56

Generic term for metal sandpaper but yeah I use crc or wd40 with it

actungbaby

2nd January 2020, 20:48

I say from exp my two vfr 750s it's the cylinder by the engine u find paint peeling of around underneeth.u can get kits with new spring and seals from aftermarket .from most bike shops.

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