1969 Elan S4 Tandem Master Brake Cylinder Question

PostPost by: Certified Lotus » Mon Nov 02, 2015 2:28 am

The factory manual and Buckland's book both do not show this tandem brake master cylinder. I've searched the forums without luck to identify it. Can anyone show me what the OEM master brake cylinder looks like for this car? Does the OEM version have a cork as the float for the cap connection? This car does not have vacuum assist and is left hand drive (USA).

This could have also come from an Elan Sprint as parts of this car came from a Sprint.

DSC06856.jpg and

DSC06857.jpg and

DSC06859.jpg and

DSC06852.jpg and
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PostPost by: Mazzini » Mon Nov 02, 2015 8:14 am

Think it was fitted to Federal Elans and Plus 2's. Does your car have a brake fail warning light on the dash?
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PostPost by: pharriso » Mon Nov 02, 2015 10:26 am

Glenn, it looks exactly like that, as I said in your other thread you have the SOVY system fitted to a federal tandem system' it's all original!! Ray has a rebuild kit if you need it.
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PostPost by: Certified Lotus » Mon Nov 02, 2015 11:30 am

Mazzini, yes I have the brake fail warning light on the dash.

Phil, I looked everywhere for info in the prior posts on this site on the sovy tandem cylinder and only found one post which didn't give me a lot of information. I'm suspect of any brake master cylinder theses days as I've seen a number of variations and my own Elan S1 came with a tandem master that was not OEM. I'm just trying to figure out if this is original to the car and if so, is the float really made of cork?
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PostPost by: nmauduit » Mon Nov 02, 2015 12:15 pm

I don't know if the cork is original, if it is it is enclosed in an aluminum tube on mine :

sovy top.jpg and
sovy top
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PostPost by: Certified Lotus » Mon Nov 02, 2015 12:47 pm

nmauduit, that photo is exactly what I was looking for. Thanks. Now we need to see if others have the same system?
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PostPost by: oldchieft » Mon Nov 02, 2015 2:33 pm

I think Girling had their own float alarm soon after that master cylinder.

When that one was made the Girlling alarm was a valve.

IMG_1255_1024.jpg and
Master cylinder a delta P valva


I can post a section of the valve if you want but you would be better going for the simple answer.

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PostPost by: gjz30075 » Mon Nov 02, 2015 2:46 pm

Certified Lotus wrote:nmauduit, that photo is exactly what I was looking for. Thanks. Now we need to see if others with cars built in the same time frame have the same system?


Fixed it for you :-)
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PostPost by: pharriso » Mon Nov 02, 2015 3:17 pm

Glenn, not sure if tandem master cylinders with the Sovy device were standard in 1969, but they certainly were on 1972 federal sprints.

You seem to be missing the aluminum can around the cork... But you can adapt new replacement parts from jaguar applications. Will post details later.
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PostPost by: pharriso » Mon Nov 02, 2015 6:15 pm

Glen, to set your mind at rest here is mine after restoration:
SOVYCan_Replated1.JPG and


SNG Barrett sell the Jag unit that you can use for parts - http://www.sngbarratt.com/ProductDetails.aspx?id=f65fabf1-a6c9-46f5-b191-1172406bac46&b=US

Here's the posting on restoration - http://www.lotuselan.net/forums/lotus-suspension-f42/elan-part-found-stock-local-liquor-store-t14800.html
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PostPost by: Certified Lotus » Mon Nov 02, 2015 9:10 pm

Phil, no wonder I couldn't find the post for the Sovy, I didn't look up liquor store. Now what was I thinking :D :D :D

I just located a new sovy OEM cap from a reliable source along with some other impossible to find parts that I have been looking for around the world. One step closer to completing my S4 with factory original parts.
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PostPost by: pharriso » Mon Nov 02, 2015 9:19 pm

Certified Lotus wrote:One step closer to completing my S4 with factory original parts.


Only problem with that is your car seems to have many Sprint parts!
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PostPost by: Certified Lotus » Mon Nov 02, 2015 9:26 pm

Yeah, yeah..........an original S4 with tasteful Sprint upgrades. The best of both worlds 'cause there is no reason to only have parts from one model year :wink:
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PostPost by: lotocone » Tue Nov 03, 2015 4:13 am

Glen, I have a Federal Elan built in Dec. 1969.

My master cylinder looks like yours, except that the Sovy unit is in storage now. The plastic part between the master cyl and the metal container cracked, so I just have a plastic cap on the reservoir like Jon the Chief's picture shows. I have the dash warning light also.

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PostPost by: Certified Lotus » Tue Nov 03, 2015 11:27 am

Bob, thanks for the confirmation! I wanted to be confident that the SAVOY part was original so when I replaced it at a rediculous price I wouldn't be too upset. I think this is the last hard to find part I need to finish restoring my S4 with Sprint enhancements.
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