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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 - Brake master cylinder

Replaced front left cylinders resealed right front. Trouble bleeding the lines (puddle of fluid under car). It's a 54 TF so I ordered a seal kit from Moss.
Got the MC apart and there are pices missing. Back to moss and they have a notice to use a different P/N kit which they don't have.
Where do I go next? I like Moss because they are very close. But no dice this time
Peter Dahlquist

Buy a new MC and be done with it.
W A Chasser

I too, needed to replace my MC. Considered the cost of a brass sleeve, rebuild kit, and machine time, and lots of hassle, pretty well convinced me to buy new.

I bought a new TRW master cylinder from Abington for $135, and got it the next day, and I live in Canada.

Gord Clark
Rockburn, Qué.
Gord Clark

With so many of the products/items we use coming from wholesale suppliers ( and not just for our cars) we are reliant on the quality control throughout the supply chain. With a world motivated naturally in todays' world by price and profit and especially with often dubious sources of supply from China our oft frustration of how it affects our "hobby" is frequent. Sometimes getting it "done " locally where you speak to the person responsible for the job is in the long term cheaper certainly on the nerves.
JK Mazgaj

I put a TRW master cylinder in the TF a few years ago and no complaints. Actually, the whole braking system was replaced with new, including the lines. To me, stopping is more important than making them go fast!
PJ Jennings

I have installed a new MC. Much easier than I thought.
I'm little worried. The unit is dry. How does the fluid get in front of the Master cup/piston? I'm looking at the WSM and I see the small orifice. Does the fluid leak down that hole? I don't want to take this thing out and prime it. Priming is not mentioned in the text so I guess it should work somehow. Going to bleed the system tomorrow.
Peter Dahlquist

Peter,

Eventually it will as you bleed the system, but may take a lot of fluid refills to insure the MC is properly bled. One suggestion....if you remove the metal pan in the drivers foot-well that covers the MC and 4 way connector, it makes access/refilling/level
checking the MC a lot easier. (16 small screws). With that removed you can disconnect the short brake line from the MC to the 4 way, insert a bleeder screw in the adapter, attach a bleed hose to that, and then loop it into the top of the MC to recirculate, and then pump it until the fluid runs with no air bubbles, then reconnect the short brake line and finish bleeding the rest of the system. Again just an alternate suggestion to insure the MC is bled.

Jim

Jim Rice

Peter,
On the back stroke a vacuum is pulled in the cylinder. Fluid is pulled down the larger drillway as the seal collapses and is then pulled through the holes in the piston into the bore.
The smaller hole is a recuperation hole to prevent lock up as the fluid expands due to heat.
Ray TF 2884
Ray Lee

Thank you. The WSM does show a very tiny hole in the piston. I did not notice that.
Peter Dahlquist

This thread was discussed between 25/07/2022 and 29/07/2022

MG TD TF 1500 index

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