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cooperess
PostPosted: Sun May 16, 2021 11:26 am 
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I am having trouble, which way round do the master cylinders go. Brake at the back or front and clutch at the back or front.

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EngineBay.JPG
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1970-morris-mini-cooper-s-mkii-saloon1.jpg


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gtogreen1969
PostPosted: Sun May 16, 2021 12:36 pm 
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The early 1969 MK2 S had tin tanks like the MK1 S.

Attachment:
Early MK2 Cooper S Brake and Clutch master cylinders.jpg



The plastic type cutch master was added some time before the plastic type brake master.

Attachment:
Mid 1969 MK2 S.jpg

Attachment:
SLL 52 pg4 Clutch Brake Master Cylinder change YG2S4 924.jpg




From YG2S4 924 they had Plastic Brake master tank to the rear. Plastic Clutch master tank to the front.

Attachment:
Post YG2S4 940 MK2 S.jpg


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cooperess
PostPosted: Sun May 16, 2021 3:56 pm 
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Now I am utterly confused GTO. I was wondering about postion, now I need to know if I need a tin or plastic can.
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gtogreen1969
PostPosted: Sun May 16, 2021 4:28 pm 
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cooperess wrote:
Now I am utterly confused GTO. I was wondering about postion, now I need to know if I need a tin or plastic can.
I thought I would add the extra info for 2 reasons. You may want to fit the factory correct style and the bolt length may be too short if you fit the wrong type.
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cooperess
PostPosted: Sun May 16, 2021 7:08 pm 
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Do you have pictures of the two different pedal box types GTO?
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gtogreen1969
PostPosted: Sun May 16, 2021 7:11 pm 
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cooperess wrote:
Do you have pictures of the two different pedal box types GTO?
No I don't. It's probably the same with just longer bolts welded on.
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cooperess
PostPosted: Sun May 16, 2021 7:15 pm 
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Just need to know now how much thread shows in both cases.
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gtogreen1969
PostPosted: Sun May 16, 2021 7:41 pm 
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If using the plastic type master cylinders just make sure at least one thread is showing with the base spacer and spring washers fitted.
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cgo
PostPosted: Sun May 16, 2021 8:08 pm 
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Shown is a pedal box from a Sept 1970 S with dual plastic reservoirs. Your may be able to get an idea of the length of the stud/weld-bolts.


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Clive G
1969 Mk II Cooper S
1970 MK II Cooper S
1963 Triumph Spitfire
1982 RX-7 Series 2
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gtogreen1969
PostPosted: Sun May 16, 2021 8:11 pm 
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Here is one from a Sep 1970 MK2 S. There appears to be 23 threads showing

Attachment:
Pedal Box Sep 1970.jpg


I think this one is from a MK1 S. Looks to be about 18 threads showing.

Attachment:
MK1 S Brake pedal.jpg


Sorry I dont have a side by side comparison


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cooperess
PostPosted: Sun May 16, 2021 9:49 pm 
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Good work gto & cgo. Now to check my pedal boxes.
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gtogreen1969
PostPosted: Sun May 16, 2021 9:57 pm 
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If it helps - YG2S4 839 was fitted with the tin master cylinders.

Attachment:
YG2S4 839 Photo taken October 1969 at Bathurst.jpg


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ausdino
PostPosted: Mon May 17, 2021 9:08 pm 
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My pedal box from a March'70 S with dual plastic reservoirs.


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1970 Mk2 Cooper S under restoration
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cooperess
PostPosted: Tue May 18, 2021 11:46 am 
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So, the long bolted pedal box is Mk2 and the short bolted pedal box is Mk1.
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Bill B
PostPosted: Tue May 18, 2021 1:01 pm 
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Attachment:
Pedal box stud lengths tin and plastic styles.jpg

Photos of Mk 1 tin tank and Mk2 plastic reservoir style pedal boxes.
(Photo is a bit deceptive for length as the shorter one is further away).
Early Mk1 S(both tin tanks) on LH side: 20 threads are showing; 22mm long.

Mid-1970 Mk2 S (both plastic reservoirs) on RH side: 24 threads showing; 25.5mm long.

The early pedal box (on right) used hex bolts welded to the underside - Mk2 (on left) used special studs welded on.


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