Lotus Elan

How long does a MC rebuild last?

PostPost by: tedtaylor » Sun Sep 10, 2017 2:26 pm

What did I do wrong? I rebuilt my '73 Elan Sprint master cylinder last year and with only just 1,000 miles under my belt, the MC is leaking through the back seal onto the firewall.
I did not sleeve the unit, only a very slight honing. Used typical rebuild kit from the usual supplier. Perhaps I needed to coat rubber seals with red brake grease?
Has anyone else had short life span on their rebuilt MC's??
feedback please! :)
"Driving a Lotus is a triumph of bravery over intelligence." Stirling Moss
"TaylorMadeClassicCars" on WWW and Facebook
Fourth Gear
Fourth Gear
Posts: 658
Joined: 09 Dec 2012
Location: Smyrna, Delaware, USA

PostPost by: patrics » Sun Sep 10, 2017 6:18 pm

Hi Ted
What master cylinder is it?

Couple of points
If the cylinder was originally worn then honing isn't going to fix that
Quality of seal kit?

Fourth Gear
Fourth Gear
Posts: 542
Joined: 21 Sep 2003

PostPost by: tvacc » Mon Nov 06, 2017 5:55 am

Wrong brake fluid? Only use Castrol.
Tony Vaccaro
LOONY (Lotus Owners of New York)
Drive Fast Take Chances
71 Spyder Elan, ElanGTS, 93 Caterham, 05 Elise,
99 Elise190, 91 M100 Elan, 74 Europa, 72 Europa JPS #15, 68 Elan Coupe RHD
User avatar
Coveted Fifth Gear
Coveted Fifth Gear
Posts: 1174
Joined: 24 Dec 2003
Location: Buffalo NY

PostPost by: 512BB » Mon Nov 06, 2017 7:17 am

You assembled it dry and tore the rubbers when first operated?

Fourth Gear
Fourth Gear
Posts: 885
Joined: 24 Jan 2008
Location: Cambridgeshire, UK

PostPost by: Orsom Weels » Mon Nov 06, 2017 8:29 am

Very possibly could just be the quality of the materials used in the manufacture of the seal kit. Modern rubber components just don't seem to be up to much now. I've had a batch of master cylinder kits for Norton Commandos fail very early their life, it's almost becoming an annual job to replace them. I've tried different brands of fluid, all to the correct spec, but that doesn't seem to make any difference. The only constant is the seal kits & as there's only one or two manufacturers of such things choice is limited.

Orsom Weels
Third Gear
Third Gear
Posts: 492
Joined: 31 Oct 2011
Location: Norfolk, UK

PostPost by: pharriso » Mon Nov 06, 2017 12:26 pm

Ted, as a point of reference, I rebuilt my master with a kit from Ray in April 2014, still good! :D

That's 4 seasons & 1,200 miles.
Phil Harrison
1972 Elan Sprint 0260K
User avatar
Coveted Fifth Gear
Coveted Fifth Gear
Posts: 2800
Joined: 15 Sep 2010
Location: Long Island NY, USA

Total Online:

Users browsing this forum: No registered users and 5 guests