Plate under master cylinders on LHD cars

[AndyB72]

When I fit one of the master cylinders on my '68 Innocenti there's a gap. Should there be another plate or bigger gasket under the master cylinder, or do I need a plate with a smaller hole?

[Vegard]

You've got a plate for a twin circuit master.

[AndyB72]

Thats what I was thinking, is the one for the baked bean can master cylinders different? Anybody got one for sale?

[JC T ONE]

You've got a plate for a twin circuit master.

which Hydro car has twin circuit master ? some Inno model ?

The brake master cylender has a bigger foot, so isnt it a clutch master in the pic ?

[guru_1071]

The brake master cylender has a bigger foot, so isnt it a clutch master in the pic ?

your correct, thats a small foot clutch master, the braker is bigger and has the little cut out in it.

andy must be getting confused as to what foot does what in a left hand drive car!

[AndyB72]

I tried both master cylinders in and thought they were the same size, I just dropped in the first one I had to hand for the photo.

[guru_1071]

ANDY

the NAM1718 is the spacer that corrects the length of the pushrod on the early tandam master cylinders

it was probably a quick bodge the factory did as they (i assume) found that as the brakes warmed up and expanded the fluid, the fluid would 'jack' the cylinder in the master cylinder up and jam the brakes on. sticking a fat shim under the master cylinder would increase the free stoke of the connecting pin and prevent this occurance from happening. using a shim would have been cheaper than remaking the length of the pin.

rich

[Vegard]

You've got a plate for a twin circuit master.

which Hydro car has twin circuit master ? some Inno model ?

The brake master cylender has a bigger foot, so isnt it a clutch master in the pic ?

A Norwegian 1275GT would for instance.

[JC T ONE]

A Norwegian 1275GT would for instance.

Hi Vegard,

just had a look in the BMC/BL parts catalouge, it say that BL did have a twinmaster (37H 2768) but that its not for the GT.

The only "early" GT I ever saw with a twinmaster cyl, was a Swedish 1974 (same spec as UK).

Hydro was deleted in 1971, so can you help with some details ? (for the 1275GT registre) .


Jens Christian

[AndyB72]

A new one on me, I didn't realise brake masters came with different flange sizes. Looking at some old photos of my Inno before I restored it, it had the brake/clutch master cylinder with the smaller flange. A guy on another forum has confirmed his had a plate underneath the brake master cylinder.

Thanks for the reply Rich, I think I edited my post just before your reply. I did a google search and it came up that it was for the twin master.

[JC T ONE]

Ahh - the big "foot" master cylender, in the flesh