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MG Midget and Sprite Technical - Brake Master Cyl Cap

I am looking for a replacement master cyl cap to use with my Easibleed. Unfortunately the brake master fitted to my frog is non standard with a large reservoir and as far as I can see it is marked Lockheed XXX-405C (3/4"). Can't reliably read the XXX but it might be 3211
The cap looks like around 80mm diameter over the thread.
Does anyone recognise that as an MG part - the indication is that it might be a type used on the later midgets?
gunson don't seem to supply a range of caps anymore but offer a universal cap. I really don't like the look of that as anyone who has used the Eezibleed knows the risk and consequences of a pipe or cap coming off!
Graeme Williams

This is what's on my late 1500 http://www.ebay.co.uk/itm/BRAKE-MASTER-CYLINDER-CAP-AAU3815-AP-4325-148P-/141964608438?hash=item210dc003b6 which has a different code.

I didn't trust the universal cap either, so bought one of these, drilled through the little vent hole and used that. I did find that the cap was in two parts so had to loose the 'inner cap' to make it work
timmyk

Timmy k: does that look like 80mm across the thread?

The master cyl must have been changed when disks were fitted in the past and the cap is very large in comparison with the norm. It is only a single circuit not that that should affect the size of the cap.
Graeme Williams

yes ~80 ID, 90 OD - you can see it in the photo (with the Haynes page behind) - I think its standard for the late model dual circuit cars.

Whereabouts are you - i'm in Broadstairs if you want to borrow it - or I can post it, it's very light

timmyk

Or you could both get together at the East Kent Masc meeting at the Crown, Sarre, this coming Sunday.
Alan
www.masckent.org
Alan Anstead

A visit to a car breakers yard should get you one, or several. And probably at zero cost.
GuyW

Timmy - would you be able to get to the Sarre meeting as Alan suggests. I had been wondering about going anyway as the weather looks promising!
Graeme Williams

Graeme

Here's a tip you might want to think about - I cant take the credit as it was not my idea, so I will quote it direct from the MGA archives

"I have my own trick with Eezibleed that avoids the mess. It slows proceeding down though. I have the 1600 extension on my MC so there is plenty of capacity in there for doing one brake at a time. Therefore I never fill the Eezibleed bottle with fluid. I just let the MC fluid level drop. After doing one brake I top it up again, wait for it to settle then continue with next brake. - Steve"

Sounds like a clever idea to me-using the eezibleed bottle as an air chamber only.
Good luck, Graham
Graham V

Graham: I think I remember reading that. Because I work off the floor moving from one wheel to the next is quite laborious so refilling between wheels wouldn't really be an issue. I'll give that a try! Thanks for reminding me. Better than Dot4 over the paintwork.
Graeme Williams

Graeme
I just looked at the Gunson website and the picture shows a range of caps. Why not call them? I had a problem with my Eezibleed a few months back and they sent me a replacement part without any problem
Graham
Graham V

Dont have a lot of pressure in the tyre when coupling to an Easi-bleed.
Alan
Alan Anstead

Timmy: thanks for your help. I've bought that one on ebay.

Graham: I did look at that but this cap seems much bigger than their largest. Even their dodgy looking "universal" is too small.
Graeme Williams

This thread was discussed between 03/05/2016 and 06/05/2016

MG Midget and Sprite Technical index

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