Lotus Elan

Servo Non-Return Valve

PostPost by: William2 » Fri Nov 25, 2016 5:44 pm

I fitted a new Lockheed copy brake servo and sourced a non return valve off Ebay which I fitted in-line with the servo rubber hose teed off from the manifold (as shown in photo). The servo works very well but I have noticed that when I start a journey the brakes stick on briefly after initial braking but are fine from then on. I assume the non return valve I fitted is suitable as there is an alternative type that screws straight on to the brass manifold adaptor. Does my installation look ok from the photo (the valve is about 6" down from the manifold) and is it likely that the sticking brakes is a valve problem or something else? Has anyone had a similar problem?
Attachments
elan-rebuild-april-2015-017.jpg and
William2
Fourth Gear
Fourth Gear
 
Posts: 941
Joined: 20 Jan 2013
Location: West Sussex

PostPost by: billwill » Sat Nov 26, 2016 1:06 am

I don't think your position makes any difference, but if that arrow on the valve shows the direction of air flow, then it is the wrong way around.

The engine is supposed to suck the air from the reservoir in the front member, not vice versa.
Bill Williams

36/6725 S3 Coupe OGU108E Yellow over Black.
billwill
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 4715
Joined: 19 Apr 2008
Location: London UK

PostPost by: William2 » Sat Nov 26, 2016 8:56 am

Hi Bill, the headlights seem to work ok but I could try reversing that valve. Regards, William
William2
Fourth Gear
Fourth Gear
 
Posts: 941
Joined: 20 Jan 2013
Location: West Sussex

PostPost by: Orsom Weels » Sat Nov 26, 2016 10:30 am

I seem to remember there has been some chat about these replacement copy servos on here in the past, but the search function has let me down again & the only thread I can find is this one,

lotus-suspension-f42/yet-another-brake-servo-question-t15866.html.

<Edit> Just found another thread using google :)

lotus-suspension-f42/powertune-servo-t34503.html

I've had no experience of them first hand, however, I have heard a lot of complaints from other classic motoring circles & a quick google search threw up several reports of poor assembly &/or build quality. Here are just a few

http://www.mg-cars.net/mgb-technical-bb ... 611357.htm

http://www.tr-register.co.uk/forums/ind ... -problems/

http://www.nsra.org.uk/newforum/showthr ... mote-servo

It seems brakes holding on is not an uncommon problem & can be caused simply by the incorrect orientation of the servo unit, or by a fault in the assembly/manufacture. It's probably worth doing a bit of research to find out what others have done to get round the problems.

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

PostPost by: LorraineLH » Tue Nov 29, 2016 3:19 pm

Interesting....in the past few weeks Mini Cooper Register members have also complained about these Lockheed replica servos and have recommended to others that they "buy Bosch".
LorraineLH
First Gear
First Gear
 
Posts: 18
Joined: 20 May 2016
Location: Grayshott

PostPost by: Robbie693 » Thu Dec 08, 2016 6:37 pm

There is supposed to be a spring under the air cap which has been missing on lockheed servos for years, the spring stops the brakes sticking on!

See page 3 in attached:
Attachments
RemoteServo.pdf
(1.1 MiB) Downloaded 329 times
User avatar
Robbie693
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1615
Joined: 08 Oct 2003
Location: UK

PostPost by: chrisbeck » Thu Apr 27, 2017 10:17 am

I realise this is an old thread but I'd like to thank all the contributors for their advice. I've had sticky brakes for a while and this info led me to remove the air filter cap and free up the air relief seat and apply a little silicon grease which has fixed the problem. To be honest, I'd always assumed that a replacement servo had been fitted during the re-build but it appears to be original.
Thanks guys,
Chris
1970 Lotus Elan S4 SE
1990 Morgan +8
2006 Aston Martin V8 Vantage
chrisbeck
First Gear
First Gear
 
Posts: 23
Joined: 26 Aug 2010

PostPost by: chrisbeck » Thu Apr 27, 2017 10:36 am

William2 wrote:Hi Bill, the headlights seem to work ok but I could try reversing that valve. Regards, William

On my Elan the small check valve is mounted close to the servo, not sure if that would make any difference.
The brass valve is connected to the vacuum chamber for the lights and according to my copy of the Brian Buckland manual the arrow points opposite to the flow so yours is correct, hence your lights work! My car is the same.
Chris
1970 Lotus Elan S4 SE
1990 Morgan +8
2006 Aston Martin V8 Vantage
chrisbeck
First Gear
First Gear
 
Posts: 23
Joined: 26 Aug 2010

Total Online:

Users browsing this forum: No registered users and 12 guests