13 replies to this topic

[ibby4585]

Hi.

Does anyone know what Brake and clutch Master Cylinders were used on a 80' GT please? Does it have a Bias too?

Mine are missing from my rebuild and I'm not entirely sure what it had.

I'm running the original 8.4 discs but I've upgraded to Metro 4 pot Calipers.

Also has anyone any pictures of the brake hose layout from cylinder to calipers please.

Thanks
Kris

[Ethel]

Clutch is easy enough 

 

For the brakes have you got a fam7821 on the bulkhead?

 

If you have then GMC227 will be your best option, be sure to connect it all correctly and you'll need the brake pipe kit if it wasn't originally a stepped bore master - lower (big) pipe connection is for the front which is the left side of the fam7821 as it appears above.

[ibby4585]

Hi.

I haven't got anything on the bulkhead it's a bare engine bay at the moment. All I have is a new copper pipe running from the rear in under the front subby.
This is what I thought I needed.

http://www.minispare...ic/FAM7821.aspx
http://www.minispare...sic/GMC172.aspx
http://www.minispare...sic/GMC167.aspx

Then copper pipework but I don't want to order it until I know it's right.

Also I'm not sure what pipework I need? I take it the pipe runs from the o/s front subby connector around to the the n/s hose?

[Spider]

As I mentioned on the other forum, they didn't have the pressure limiting valve, they had an Interia Valve, P/N 13H7757. They are very hard to come by, however I saw that Mini Seven in the US still have a few.

[ibby4585]

As I mentioned on the other forum, they didn't have the pressure limiting valve, they had an Interia Valve, P/N 13H7757. They are very hard to come by, however I saw that Mini Seven in the US still have a few.

To be honest, I've looked throughout my build and other builds and I can't seem to find what your talking about, every 1275gt build I see has a Bias in the engine bay!

[Spider]

 

As I mentioned on the other forum, they didn't have the pressure limiting valve, they had an Interia Valve, P/N 13H7757. They are very hard to come by, however I saw that Mini Seven in the US still have a few.

To be honest, I've looked throughout my build and other builds and I can't seem to find what your talking about, every 1275gt build I see has a Bias in the engine bay!

 

 

They started fitting the 13H7757's in 1978.

[Spider]

[GraemeC]

I'm not sure we ever had an inertia valve fitted on UK cars.
(I've been wrong before though)

[ibby4585]

Yes I'm sure they are only for lhd and export cars only.

[Spider]

Fair enough, I guess you can fit what you'd like.

 

That page from the parts book ^ is for UK cars (sold in the UK).

[ibby4585]

Fair enough, I guess you can fit what you'd like.
 
That page from the parts book ^ is for UK cars (sold in the UK).

Well no actually.

The whole point of the thread is to find out what my 1980 Gt had for brakes when it left the factory.

You might well be right but I need to find out for sure.

The only thing I would say is, if the Inertia part located on the rear subframe worked really well and was a UK part, why aren't Minispares and other places stocking it.

[ibby4585]

There is this.

Basically what your describing, but I must admit I'm not sure any of my mini's had it??
http://www.minispare...74.aspx|Back to

[Spider]

There is this.

Basically what your describing, but I must admit I'm not sure any of my mini's had it??
http://www.minispare...74.aspx|Back to

 

Err, no.   That is a Pressure Limiting Valve, however it is not a standard one in any case, it is an adjustable one.

 

 

This is a 13H7757

 

 

and this is where they go (sorry for the poor pic)

 

 

I don't know why Mini Spares don't have them, they are hard to come by, however BullMotif in the UK have them as does Mini Seven in the US.

 

They were only fitted for less than 2 years in production, and at that time, not many GTs were made.

[ibby4585]

None of my mini's have had that I'm afraid.