MG-Cars.net

Welcome to our resource for MG Car Information.

Recommendations

Parts

MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG TD TF 1500 - Master cylinders

Anyone fitted a TD/TF master cylinder to a TC.
JK Mazgaj

Not me. But I have recently taken a TC master cylinder to a brake specialist to have it sleeved down from 7/8" to 3/4". It is something I have been meaning to do for my road TC for about 35 years! It will reduce the cross-sectional area to about 73% of the original. Those familiar with "Boyle's Law" (or whatever we learnt in high school Physics) would know that it should reduce the pedal pressure to 73% of what it was before the modification. A TC brake pedal feels VERY hard underfoot, so should easily cope with the change.

I have a tandem master cylinder in my race TC. It is from a Wolseley 4/44 which is similar to an MGA. Instead of using it as brake and clutch, I use it for separate front and rear brake circuits. That is sleeved down to 5/8" if I remember correctly. Probably about the same total area as an unmodified single 7/8" original, but the car is much lighter.

What is the bore size of a TD/TF master cylinder, and why are you thinking of fitting one to a TC?

Cheers from South Australia,
Bob Schapel
R L Schapel

Bob, The TC I'm rebuilding whilst having been dry store since 1956 has still suffered the ravages of time. The existing master cylinder could obviously be rebuilt but with questionable integrity or a TC replacement. However with a TC replacement at in excess of £300 sterling compared to a TD/TF model with its refinements at half that and a bare chassis I'm exploring options. I would add that while it would be great to keep as original as possible at least this is an item "out of sight".
JK Mazgaj

Still on this subject I read somewhere that they'd fitted a Wilwood High Volume Aluminium Master Cylinder but try as I might can't find the comment. Anyone help? The reason I'm asking is that it is supplied in various bore sizes and it would be helpful to know which to get if I go down that route.
JK Mazgaj

Bob,

For information, Boyle's law applies to compressible media (gas) Pascal's law applies to in-compressible media, in our case, oil.

John
J Scragg

This thread was discussed between 04/07/2020 and 20/08/2020

MG TD TF 1500 index

This thread is from the archive. The Live MG TD TF 1500 BBS is active now.