hyd clutch pedal slow to return

[steveo3002]

1991 golf g60 with hydraulic clutch

new slave , master , hose ..all set up on the bench and bled so master rod is hard when the slave is blocked , pedal has working return spring

transferred over to the car as is so not disturbed , all bolted on it works but the pedal is slow to come up to rest

any ideas ? i have found the original slave is 22mm , replaces are now 23.8 would that cause this? cant find a 22mm

[GreenV8S]

I suppose that the master and/or slave are too tight and/or the return spring is too weak.

[steveo3002]

GreenV8S said:

I suppose that the master and/or slave are too tight and/or the return spring is too weak.

yeah im going to see if i can get another spring

in my mind it feels like the fluid is restricted from moving back fast enough

[GreenV8S]

Does it have a clutch valve?

[donkmeister]

Is the clutch release itself freely moving?

I had the same problem caused by the actual lever going into the bell housing being sticky. Lubricated that with some light oil and the problem went away.

[steveo3002]

no clutch valve

everything moves like it ought when off the car /separate

anyone smart enough to tell me what 19mm master -22mm slave VS 19mm -24mm slave does ?

or would a undersize bore hose /pipe cause it?

[GreenV8S]

steveo3002 said:

anyone smart enough to tell me what 19mm master -22mm slave VS 19mm -24mm slave does ?

Roughly 20% more pedal travel for a given clutch travel, and 20% less force at the pedal.

[steveo3002]

GreenV8S said:

Roughly 20% more pedal travel for a given clutch travel, and 20% less force at the pedal.

hmm might be onto something then , found a place that could re sleeve the old one

[Peanut Gallery]

Ok, this car is about as different as you can get, but..

https://www.youtube.com/watch?v=BHLqlFX4cu4

(TL:DR = 2016 Ford Mondeo, clutch pedal occasionally sticks to the floor, after many an hours work a small bit of O-ring is found lodged inside a different part, and would occasionally move and stop the fluid from returning, thereby holding the pedal down.)

[2Btoo]

Funnily enough I have had precisely this problem on my 944.

The cause was peculiar; the hydraulic fluid I used was too thick for the application. Not sure why; it was good quality stuff and the bottle had only been opened once some time past and was otherwise well sealed. But it seemed thick when I poured it in and the pedal movement was slow.

New fluid was noticeably thinner and problem solved.

[steveo3002]

heh thats strange...using new dot 4

ive put the old original master in for re sleeving and rebuilding , not convinced its that but nice to keep the orig spec /ratio