Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 3rd August 2021, 09:56   #1
ashy90
Avid contributor
 
MG ZT 160 V6

Join Date: Jul 2012
Location: West Sussex
Posts: 127
Thanks: 1
Thanked 8 Times in 7 Posts
Default Has any one had issues with metal master cylinder?

Just wondered if anyone has had issues with the metal master cylinder?
I bought one off eBay and after having had loads of trouble bleeding it and unable to get a full pedal, I've noticed it seems to be weeping fluid slightly.
Read a comment on one of the Facebook pages recently with someone having issues bleeding a metal master too.
ashy90 is offline   Reply With Quote
Old 3rd August 2021, 15:52   #2
COLVERT
This is my second home
 
R75 Saloon.

Join Date: Feb 2009
Location: France/or Devon.
Posts: 14,003
Thanks: 3,851
Thanked 2,167 Times in 1,816 Posts
Default

There are lots of posts about the metal master cylinders in the forum stats pages.
COLVERT is offline   Reply With Quote
Old 3rd August 2021, 16:02   #3
ashy90
Avid contributor
 
MG ZT 160 V6

Join Date: Jul 2012
Location: West Sussex
Posts: 127
Thanks: 1
Thanked 8 Times in 7 Posts
Default

Sorry not sure where you mean. I have searched.
ashy90 is offline   Reply With Quote
Old 3rd August 2021, 16:22   #4
kaiser
This is my second home
 
kaiser's Avatar
 
75 Tourer 2.5 Auto, 1.8T, 75V8ZT

Join Date: Jun 2007
Location: Johannesburg ZA
Posts: 6,200
Thanks: 1
Thanked 859 Times in 613 Posts
Default

Not that I follow this, having automatics, but I seem to remember Tazu being mentioned often.
That might be what you are looking for.
Why they should leak seams strange to me.
Maybe get better rubber and hone the surface of the cylinder.
It can't be rocket science, unless the material is inferior, I would guess?
__________________
Worth his V8 in gold
kaiser is offline   Reply With Quote
Old 3rd August 2021, 17:22   #5
Ducati750cc
Loves to post
 
Rover75 tourer

Join Date: Jun 2018
Location: Ashton
Posts: 428
Thanks: 121
Thanked 206 Times in 145 Posts
Default

Quote:
Originally Posted by ashy90 View Post
Just wondered if anyone has had issues with the metal master cylinder?
I bought one off eBay and after having had loads of trouble bleeding it and unable to get a full pedal, I've noticed it seems to be weeping fluid slightly.
Read a comment on one of the Facebook pages recently with someone having issues bleeding a metal master too.

Weeping fluid exactly where from ?
__________________
Common sense isn't a gift, it's a punishment because you have to deal with everyone who doesn't have it.
Ducati750cc is offline   Reply With Quote
Old 3rd August 2021, 17:41   #6
roverbarmy
This is my second home
 
roverbarmy's Avatar
 
Roverless + 1.7D Sportage

Join Date: Aug 2014
Location: East Norfolk
Posts: 7,022
Thanks: 729
Thanked 2,021 Times in 1,449 Posts
Default

Here's a pic of the brass sleeve within the metal cylinder. It was my opinion that the tiny seals between the alloy and the brass leaked when under clutch operating pressure and then dribbled out via the piston operating rod, where the pedal is joined. Just my opinion.





They do not appear to be pressure seals but are under operating pressure.
__________________
Oil in my veins!

Last edited by roverbarmy; 3rd August 2021 at 17:44..
roverbarmy is offline   Reply With Quote
Old 4th August 2021, 06:04   #7
kaiser
This is my second home
 
kaiser's Avatar
 
75 Tourer 2.5 Auto, 1.8T, 75V8ZT

Join Date: Jun 2007
Location: Johannesburg ZA
Posts: 6,200
Thanks: 1
Thanked 859 Times in 613 Posts
Default

If the picture is of a pressure piston, it looks completely wrongly designed.
Firstly an o-ring in that position is not the best choice, and secondly, if chosen, it is of far too small cord diameter.
But it would be far better to machine the front of the piston to take a conventional brake cylinder seal, with a skirt that is pressed against the sidewall when applied.
It would be a small thing to get this to work!
It looks like decent material and the machining is also good, just wrong.
__________________
Worth his V8 in gold
kaiser is offline   Reply With Quote
Old 4th August 2021, 06:40   #8
roverbarmy
This is my second home
 
roverbarmy's Avatar
 
Roverless + 1.7D Sportage

Join Date: Aug 2014
Location: East Norfolk
Posts: 7,022
Thanks: 729
Thanked 2,021 Times in 1,449 Posts
Default

The pic is of the sleeve that the piston slides in. I don't know why a sleeve was needed in an alloy body anyway. Perhaps the castings or the ally weren't up to the job?

Sent from my SM-G903F using Tapatalk
__________________
Oil in my veins!
roverbarmy is offline   Reply With Quote
Old 4th August 2021, 18:31   #9
Number 6
This is my second home
 
Rover 75 tourer Club CD/Limo Tints

Join Date: Nov 2008
Location: Meneac
Posts: 6,759
Thanks: 5,007
Thanked 1,609 Times in 869 Posts
Default

I have had a Metal master for several years now, I have never had a problem with it . The only thing which is slightly annoying is the engine compartment "noise" that is transmitted along the copper pipe, other than that not been a problem.
__________________
]

"I started out with nothing, and Ive still got most of it left!"
Number 6 is offline   Reply With Quote
Old 18th August 2021, 12:01   #10
ashy90
Avid contributor
 
MG ZT 160 V6

Join Date: Jul 2012
Location: West Sussex
Posts: 127
Thanks: 1
Thanked 8 Times in 7 Posts
Default

Just to update on this. It was the new metal master cylinder at fault.
Just could not get a full pedal. Fitted a new plastic master cylinder from dmgrs with original plastic pipe, and it bled up no problems and has been fine since.

Interestingly if I disconnected the master and slave, the pedal was firm, but it must have been drawing in air from somewhere. The metal master seemed to be weeping fluid - hard to tell where from but I think it was between the cylinder and reservoir.
ashy90 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 09:22.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd