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MG MG Y Type - YA Front brake cylinders

What is the inside diameter of the YA front brake cylinders either mm or imperial. A bout of laziness has afflicted me so it would save me dismantling the brakes if anyone has this info to hand. Thanks Bryan
B Mellem

Good question - I am sorting out a large pile of Y-Type wheel cylinders today - I will make some notes and send them to Paul to add a section into Technical Data on the website. Thanks Bryan.

Tony Slattery
The Classic Workshop
Black Mountain
Australia
A L SLATTERY

I have two cylinders on the bench which I intend to get re-sleeved and these are 1.125", so I just want to be sure before dispatch they are the front cylinders. Bryan
B Mellem

hi bryan,my fronts have 1 1/8" moulded into the rubbers which is the same as 1.125, hope this helps, Graham
Graham Sharpe

Sorry Bryan I did not get back to this earlier - fronts are 1 1/8" (1.125") as Graham has said, and the rears are 1" (1.000").

Tony
A L SLATTERY

Hi Bryan,
I advised Ron with his 51YA to have his cylinders resleeved, in less than a year after i had fitted them they were leaking to the extent that the shoes had to be replaced the company redid the cyls and paid for new shoes. within a short while the redone cyls were starting to leak!! ron bought NEW cylinders no problem since that was a couple of years ago. New ones are pricy but worth it for the ten years plus you will get out of them
John UMG624
JC Jebb

Thanks Tony and Graham. A company by the name of 'Contract Auto Engineering' of Stourport on Severn have quoted me about £50 each to re-sleeve and assemble. I had the master cylinder done by them a while back which seems to be OK. If it works out then its a lot cheaper than a new pair of YA cylinders.
I will report back. Bryan
B Mellem

I have had no issues with re-sleeved cylinders here. I would suggest the quality of the seals is not up to the job if they are leaking so soon after being re-sleeved.

I use "Knight's Old School Brake Service" in Brisbane - they do mail order repairs. They really know how to deliver quality products & service for "older" MG's.

Tony
The Classic Workshop
A L SLATTERY

Since talking to one of the bosses at Contract Auto who went in to great detail about how they sleeve cyls etc i think i would try again with resleeved cyls but if they were going into the spares box i would just have bare cyls and buy the rubbers at the time of use. Interesting firm Contract Auto whose main job is reconning cylinders from all and sundry MOD etc etc.
John UMG624
JC Jebb

I re-sleeved all the wheel cylinders when rebuilding my YA and have had no issues with any of them for nearly 20 years now: I'd suspect the seal/fluid combination if you've had leaks. I used silicone fluid (DOT 5) and did find that "new" seals - ie fresh ones and not some old unused ones that you've had lying around for a few years - worked best.

(Slightly off the point, but relevant: I know that the use of silicone fluid is sometimes controversial, but the result of using it with stainless cylinders and non-ferrous brake pipes is almost no wear or corrosion in the system over a couple of decades.)
Tim Griggs

When you rebuilt the seals back into the cylinders, you did fit NEW spreader crowns didnt you?

Paul
Paul R Barrow

An excellent point regarding the use of silicone brake fluid Tim. My MGA had been rebuilt over a number of years and posibly 2 years before I acquired it a complete new braking system had been fitted along with many other upgrades. This uses DOT 5.

It has been excellent and I sense that rather like Tim's YA the system was totally new from the start.Whether others who have experienced problems with silicone fluid have not thoroughly cleaned all the key parts I have no idea and I can only draw on persnal experience.

Brian asked abou re-sleeving and for both the TA, that I used to own. YA (sold to purcahse the TA) and the YT I now have had brake cylinders re-sleeved in stainless steel by Past Parts in Bury St Edmunds and I would recommend tham. I have no experience of Contract Auto so I can only listen to the advice given by both Brian and John.

I realise that my chat about silcone brake fluid is slightly away from the main topic. Apologies for that!

Hope all works well

Jerry
Jerry Birkbeck

Many apologies in my suggestion that unclean brake parts would be installed by any of you guys! On reading it I came to delete the possible offending sentence only to be advised that my edit time had expired!

Time I went to bed!
Jerry Birkbeck

This thread was discussed between 23/06/2015 and 07/07/2015

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