So it wasn’t the slave cylinder…

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withabix · #1 Post by **withabix** » Mon Sep 11, 2023 9:01 pm

Changed the slave cylinder tonight and refilled and bled.

Bite point is still on the floor and gear change is hard.

What do I look at next? Loose nuts on the master cylinder rod?

landcrabmechanic · #2 Post by **landcrabmechanic** » Mon Sep 11, 2023 9:17 pm

Did you bleed the master first?

withabix · #3 Post by **withabix** » Mon Sep 11, 2023 9:36 pm

landcrabmechanic wrote: Mon Sep 11, 2023 9:17 pm Did you bleed the master first?

I had no leaks from the clutch hydraulics before I changed the slave - I hadn’t lost any fluid.

Drained the clutch fluid out via the hose at the slave, changed the slave and refilled bottom-up from the slave bleed nipple…that should drive all the air out at the master cylinder reservoir?

Maybe I will give it another flush…but that should have worked?

red90 · #4 Post by **red90** » Tue Sep 12, 2023 3:55 pm

Not if the slave is installed properly. The bleeder is on top so a reverse bleed will leave air in the slave.

withabix · #5 Post by **withabix** » Tue Sep 12, 2023 6:17 pm

red90 wrote: Tue Sep 12, 2023 3:55 pm Not if the slave is installed properly. The bleeder is on top so a reverse bleed will leave air in the slave.

Interestingly, my old slave had the bleed nipple at the bottom…the reverse bleed videos have it that way up as well…

red90 · #6 Post by **red90** » Tue Sep 12, 2023 7:44 pm

What vehicle and gearbox are we talking about? Some have a problem with the angle of install and you need to slope the vehicle a bit to prevent trapped air. They are much easier to bleed before installing as you can hang the slave vertically.

withabix · #7 Post by **withabix** » Tue Sep 12, 2023 8:35 pm

red90 wrote: Tue Sep 12, 2023 7:44 pm What vehicle and gearbox are we talking about? Some have a problem with the angle of install and you need to slope the vehicle a bit to prevent trapped air. They are much easier to bleed before installing as you can hang the slave vertically.

Def 300Tdi R380.

Re-bled and seems to be much better now. Likely still a bit of air that will dislodge with a bit of driving…

red90 · #8 Post by **red90** » Wed Sep 13, 2023 3:49 am

Okay. As I said, next time bleed it before attaching to the bellhousing. Let it hang down on the flex line. There is no need to reverse bleed. Bleed nopple should be at the top when installed.

When installed park on a up slope or jack up the front axle when bleeding. Clutch pedal should have 1/4” of freeplay and then be very solid.

withabix · #9 Post by **withabix** » Thu Sep 14, 2023 7:57 am

Clutch pedal feels good, but I still have a very low disengage point on the clutch pedal and there's definitely a very slight bite with the pedal fully down. Had a look at the pedal adjustment on the master cylinder, but couldn't shift the nuts. There's about 7mm of thread in front of the back nut, but the pedal has always had more than 1/4" of freeplay in the footwell.

So its driveable, but not 'normal'.

I'm also now getting blocking when changing down from 5th - 4th (but 3rd - 4th is fine and all other gear changes are fine), and reverse is still stiff, so I'm guessing there is something else going on too...

New master cylinder is on its way to me, so that's my next step on the clutch issue....no leakage visible when I removed the cover plate last night.

withabix · #10 Post by **withabix** » Wed Sep 20, 2023 12:54 pm

Re-bled the system today to avoid changing the Master and it seems to be good again. Gear change problems have gone. Hopefully the new slave won’t make the master fail.

harv · #11 Post by **harv** » Sun Sep 24, 2023 8:19 am

I think the only way the slave could cause the master cyl to fail is if the master was virtually ready to fail anyway.

The Rover-Landers of BC

The Rover-Landers of BC