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MG TD TF 1500 - Neeed some help with a replacement rear wheel cyli

I have a car here with one of the low dollar replacement wheel cylinders in need of a seal kit. The Moss kit is made for the original type pistons...which this is not. Anybody had a go at one of these yet and if so where did you get the seals?

Thanks

MG LaVerne

Mate I dont know if the same modus operatum is used in the States. Here in Aus the major brake and clutch specialists carry a range of service kits for brake system components. I would measure the bore of your wheel cylinder, they are usually a standard imperial measurement size. Then contact a specialist and request whether they can supply cups for that size cylinder.

Graeme
G Evans

Do you have any original pistons laying around? Then you could use any 7/8" cup. I think I have some in my attic, could look late today or tomorrow if you want. George
George Butz

The days of clutch and brake shops here are long gone. Last one closed up over 30 years ago. I do have a hydraulic shop not far from me I may have a vist with today.

I have a couple of old original cylinders. I have one apart except for the piston which has been soaking overnight in WD 40. I'm going to see if I can get it out this morning but I don't have high hopes for that or that the piston will be useable if I do.

MG LaVerne

LaVerne

I have a couple of brake cylinders that are apart from an MGA. You can have them if you want.

rgt3000 at fuse dot net
Rick

Try screwing a grease fitting into the cylinder, heating it up and giving it a few pumps with a grease gun. That will work if anything will.
George Butz

Thanks guys,

I'll see how it goes. I tried the grease gun trick on the ones from my TF years ago. It didn't work as there were really ugly. I did get one apart by boiling it in water for about a half hour. Total trash.
MG LaVerne

I'm pretty sure I've got some old TD pistons laying around if no one else comes up with one for you.
David Littlefield

No seals, but I have a brand new Raybestos cylinder in my spares box. I could let it go to the cause.

Tom
'54 TF
T Norby

LaVern

A bit if heat is your friend.
The body of the cylinder is aluminum. The piston is steel.
Aluminum expands much faster.
Just heat with a propane torch and the cylinder should be free quickly.

I did mine that way some (many) years ago.

Jim B.
JA Benjamin

Photo of the cylinder.

Tom

T Norby

LaVerne,

I've found that 50/50 ATF and acetone works on corrosion as well as rust.

Gene
Gene Gillam

Thanks all, got the old piston out, cleaned it up, and installed it with the new seal. So far, so good.
MG LaVerne

For future reference should someone look this up.

Original lever on top

MG LaVerne

There is a reason for that notch in the original...it acts as a stop

MG LaVerne

comparison of the hand brake pistons. The mask is torn off the original

MG LaVerne

A comparison of the pistons. Moss does not carry a kit for the non original upper unit

MG LaVerne

Difference in the bodies. Original unit is the closest

MG LaVerne

Although the holes line up..there is a difference in the geometry as shown

MG LaVerne

Another shot of the bodies

MG LaVerne

Last one... this shows the different range of motion the other direction.

MG LaVerne

Thanks LaVerne, those are very interesting and useful comparisons. I would not have expected that much of a change, or am I just being my usual naive self. Much to learn it appears. Good thing that some of you guys still have some of the original part around.
John Brickell

This thread was discussed between 23/10/2015 and 24/10/2015

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