Discussion
As the original servo and master cylinder are mounted in a decent under bonnet space, I think a mk1 ka or fiesta mk4/5 would be a ok choice using the brake master cylinder to suit those cars too. My Griff set up is mk3 fiesta servo with a fiesta 1.8 Diesel master cylinder.
So a ka or fiesta mk4/5 would do the trick also. Possibly the pedal box will need a bit of modding to attach the servo and a suitable link made to connect the brake pedal but that isn’t a hard task.
So a ka or fiesta mk4/5 would do the trick also. Possibly the pedal box will need a bit of modding to attach the servo and a suitable link made to connect the brake pedal but that isn’t a hard task.
Engineer1949 said:
found this
//www.ebay.co.uk/itm/Ford-Cortina-MK4-5-All-Models-1979-1981-Girling-74049208-Brake-Servo/123095626537?epid=25018426116&hash=item1ca9123329:g:VLwAAOSwb~Ja3ebW
john
Saw that but the picture isn’t right //www.ebay.co.uk/itm/Ford-Cortina-MK4-5-All-Models-1979-1981-Girling-74049208-Brake-Servo/123095626537?epid=25018426116&hash=item1ca9123329:g:VLwAAOSwb~Ja3ebW
john
Think that’s the larger servo with the vacuum connector at the 2 o’clock position
Mine is the smaller one with vacuum connector at 12 o’clock
gmw9666 said:
Looks kind of correct but without dimensions it’s hard to tell if it’ll fit 
It’s clear to see why my servo went pop 😀
Obviously rotted out before and someone’s slapped loads of plastic padding over it as a “repair”
The Ka servo arrived and as Glenn predicted it’s a no go
There’s lots of differences between it and the original the main thing is that it’s just too big
Original is 190 mm dia
Ka is around 240 mm dia
I’ve got a very good car spares shop local - might try to get down there and see if he can use the catalogues he keeps to find something
Ron
Rockettvr said:
It’s clear to see why my servo went pop ??
Obviously rotted out before and someone’s slapped loads of plastic padding over it as a “repair”
The Ka servo arrived and as Glenn predicted it’s a no go
There’s lots of differences between it and the original the main thing is that it’s just too big
Original is 190 mm dia
Ka is around 240 mm dia
I’ve got a very good car spares shop local - might try to get down there and see if he can use the catalogues he keeps to find something
Ron
£5 is worth a punt
https://m.ebay.co.uk/itm/TR6-Brake-Master-Cylinder...
You’ll still need a spacer or mod the clevis pin
https://m.ebay.co.uk/itm/TR6-Brake-Master-Cylinder...
You’ll still need a spacer or mod the clevis pin
Edited by gmw9666 on Thursday 10th May 19:54
I realise its rusted out, but maybe these guys can help, as Servos have different assistance ratios so diameter etc is not the only factor.
http://www.jlspares.com/contact.htm
My feeling is TR7 is more likely the source given the age of the cars.
http://www.jlspares.com/contact.htm
My feeling is TR7 is more likely the source given the age of the cars.
Hi all
Thanks Glen - missed the eBay one though
As Sabre said wouldn’t have thought tr6 as it went out of production about 6 years before the start of wedge production TR7 would be more likely??? Found this old thread https://www.pistonheads.com/gassing/topic.asp?h=0&...
Steve Heaths comments (5th post down) are interesting but a little worrying as well !!!
It’s s bit annoying that there doesn’t seem to be any identifying marks on the servo to help identify it at all - all I know is that hat it’s Girling
Thanks Glen - missed the eBay one though
As Sabre said wouldn’t have thought tr6 as it went out of production about 6 years before the start of wedge production TR7 would be more likely??? Found this old thread https://www.pistonheads.com/gassing/topic.asp?h=0&...
Steve Heaths comments (5th post down) are interesting but a little worrying as well !!!
It’s s bit annoying that there doesn’t seem to be any identifying marks on the servo to help identify it at all - all I know is that hat it’s Girling
Edited by Rockettvr on Thursday 10th May 21:02
Morning all
My servo issues are solved - thanks to Glen
Ordered one of these https://www.moss-europe.co.uk/brake-servo-assembly...
Wasn’t sure it’d fit but found a thread about fitting a ford master cylinder to a tr6 servo
https://www.pistonheads.com/gassing/topic.asp?h=0&...
So thought it might be ok
Happy to report that it fits fine - the only issue being as Glen said is the Clevis needs adapting - I cut the old one off and welded it to the new servo
Also on the new one the “drum” part of the servo is dimensionally smaller 90mm deep and 170mm ish dia as opposed to 100mm and 190 mm ish
But mounting bolts etc are exactly the same
Wether the smaller dimensions make much difference time will tell
Fitted last night and all seemed good will report back once I’ve given it a road test
Ron
My servo issues are solved - thanks to Glen
Ordered one of these https://www.moss-europe.co.uk/brake-servo-assembly...
Wasn’t sure it’d fit but found a thread about fitting a ford master cylinder to a tr6 servo
https://www.pistonheads.com/gassing/topic.asp?h=0&...
So thought it might be ok
Happy to report that it fits fine - the only issue being as Glen said is the Clevis needs adapting - I cut the old one off and welded it to the new servo
Also on the new one the “drum” part of the servo is dimensionally smaller 90mm deep and 170mm ish dia as opposed to 100mm and 190 mm ish
But mounting bolts etc are exactly the same
Wether the smaller dimensions make much difference time will tell
Fitted last night and all seemed good will report back once I’ve given it a road test
Ron
Last week I joked about Ron's 12 o'clock take off. My vacuum hose goes to the six o'clock position. Any fluid at the bottom of the servo is presumably sucked away to the engine. Does everybody have their's at twelve?
When I checked my pedalbox I had a lot of corrosion under the clutch m/cylinder only. Maybe any leakage went elsewhere to do damage.
Wilf.
When I checked my pedalbox I had a lot of corrosion under the clutch m/cylinder only. Maybe any leakage went elsewhere to do damage.
Wilf.
Thats a good aftermarket fitment...I think I was getting confused with the Ka and Fiesta servos...more the latter me thinks...Originally they were Capri mk2 but with the modified pin...Any part numbers can go on the parts list..
Thats not too grim a price, although you may as well change the master cylinder if it still the original...change the fluid as well....
Thats not too grim a price, although you may as well change the master cylinder if it still the original...change the fluid as well....
Unexpected side effect :
Since sorting the servo my wedge has run badly from cold hunting really bad at idle and a little once warm. Cuts out occasionally on coming to a stop at lights etc
Thought it may be a problem with the new servo so disconnected the vacuum pipe and car runs well with no hunting but a high idle speed 2k rpm ish.
Conclusion:- old servo was letting a little air into the intake system allowing the car to run at a higher rpm at idle - previous owners remedy was to screw the idle screw on the plenum virtually all the way down to reduce idle speed
Cure: reconnect servo, screw idle screw all the way in and then unscrew 2 turns - idle restored
Who would have thought that replacing the servo would screw with the idle speed ? !!
Since sorting the servo my wedge has run badly from cold hunting really bad at idle and a little once warm. Cuts out occasionally on coming to a stop at lights etc
Thought it may be a problem with the new servo so disconnected the vacuum pipe and car runs well with no hunting but a high idle speed 2k rpm ish.
Conclusion:- old servo was letting a little air into the intake system allowing the car to run at a higher rpm at idle - previous owners remedy was to screw the idle screw on the plenum virtually all the way down to reduce idle speed
Cure: reconnect servo, screw idle screw all the way in and then unscrew 2 turns - idle restored
Who would have thought that replacing the servo would screw with the idle speed ? !!
Hi Adam
In bought the one in Glens post - well I googled the part number GSM90156Z and found one on eBay for £103 from David manners group (jag parts people)
My first thought was also to run a thread onto the shaft 8mm as existing but the shaft is a little too big for an 8mm die but a bit too small for anything else
Also the shaft will rotate and has some lateral movement and I couldn’t see an easy way of holding it steady to doo inch with it so I took the path of least resistance and cut the shafts and welded on the old one
Ron
In bought the one in Glens post - well I googled the part number GSM90156Z and found one on eBay for £103 from David manners group (jag parts people)
My first thought was also to run a thread onto the shaft 8mm as existing but the shaft is a little too big for an 8mm die but a bit too small for anything else
Also the shaft will rotate and has some lateral movement and I couldn’t see an easy way of holding it steady to doo inch with it so I took the path of least resistance and cut the shafts and welded on the old one
Ron
Hi Ron
Quick question as you have recently removed the servo.. (or anyone else who has done so)
I’m trying to remove mine. I have managed to contort myself enough to disconnect the pin connecting to the pedal and remove the 4 nuts that seem to be holding it in place, but it won’t seem to budge. Is there something I’m missing or has it simply fused itself to the car over the years and will require a bit of persuasion to separate.
Cheers!
Quick question as you have recently removed the servo.. (or anyone else who has done so)
I’m trying to remove mine. I have managed to contort myself enough to disconnect the pin connecting to the pedal and remove the 4 nuts that seem to be holding it in place, but it won’t seem to budge. Is there something I’m missing or has it simply fused itself to the car over the years and will require a bit of persuasion to separate.
Cheers!
Hi Jon
Good to see you’re still in the wedge club
Wot I did:
disconnect vacuum hose
Undo 2 nuts holding on master cylinder and gently pull it off the studs
Undo 4 nuts in footwell and the shaft to pedal coupling
Pull servo out
It may be that yours is the same as mine and has had a good dollop of sealant applied to the joint between the servo and bulkhead to waterproof it
Hope that helps
Ron
Good to see you’re still in the wedge club
Wot I did:
disconnect vacuum hose
Undo 2 nuts holding on master cylinder and gently pull it off the studs
Undo 4 nuts in footwell and the shaft to pedal coupling
Pull servo out
It may be that yours is the same as mine and has had a good dollop of sealant applied to the joint between the servo and bulkhead to waterproof it
Hope that helps
Ron
Yeah, still in the wedge club, though it has had embarrassingly little use in the last year or so, and currently trying to sort the brakes. You were right, it was just sealant holding it in place, a little more robust persuasion has now got it removed.
Had new front calipers at last mot, and more recently a new master cylinder, but need to adjust the servo as there is a gap between pressing the pedal and the servo rod connecting with the master cylinder but was struggling to adjust it in place. Now it’s removed thats a job for tomorrow then a good bleed of the brakes.
Had new front calipers at last mot, and more recently a new master cylinder, but need to adjust the servo as there is a gap between pressing the pedal and the servo rod connecting with the master cylinder but was struggling to adjust it in place. Now it’s removed thats a job for tomorrow then a good bleed of the brakes.
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