18 replies to this topic

[Indigo]

Was the 1275GT with single line, 8.4 inch disks (& 11/16 rear wheel cylinders) fitted with a brake regulator valve at the rear?

If so, which one?

[Chris1275gt]

Hi
I'm almost sure the 74/75 don't have a regulator. my 1975 1275gt doesn't have one and the brakes work perfectly fine. I think the smaller rear cylinders were to compensate for it not having one fitted.

[Spider]

I'd need to check on fiche but from 74 to 76 from Chassis No. 19415 to 21596A one listing I have shows they had a 211774 Regulator and 11/16 RWC.

 

The 76 to 77 from Chassis No 21770A on have no Regulator and 1/2" RWC.

[Indigo]

Spider, I am interested to see what you can confirm if you can check the old fiche.

As I would like to configure them as per factory as a starting point.

Thanks

[Spider]

Spider, I am interested to see what you can confirm if you can check the old fiche.

As I would like to configure them as per factory as a starting point.

Thanks

 

OK sure, just give me about a week, I've a bit on my plate just at the moment !

[Rorf]

Also depends on what master cylinder you are currently using.

[Indigo]

The master cylinder is 0.7 inch.  Is this corrrect for the 1275GT single line system?

[carbon]

0.7 inch bore master cylinder and 11/16 inch bore rear cylinders will need a pressure regulator on the rear brakes to prevent the rear wheels locking up under hard braking.

[Chris1275gt]

According to Somerford minis brake diagrams the 1275gt from 74/75 had 8.4 discs 11/16th rear cylinders and no regulator all other non 1275gt minis had the regulator.

[Indigo]

Guys, Thanks for the info.

I will try it without the regulator, as this sounds like the standard setup.  

If the rears lock up under heavy breaking or in the wet, I will fit the regulator.

Bit of a pain through, as some of the brake lines will need to be changed from single flare to double (or visa-versa) to change from a T to a regulator.

[Spider]

I did start looking at the fiche today, it will take some time as to piece the whole lot together, it's over several pages and some of the chassis numbers are a little hard to read.

 

None the less, I can confirm there was a long running series of 1275 GT with Single Circuit Hydraulics, 8.4" Discs and a Regulator Valve.

 

Those without the Regulator were only short lived as not too long after that, the Tandem Circuit came in.

[carbon]

Guys, Thanks for the info.

I will try it without the regulator, as this sounds like the standard setup.  

If the rears lock up under heavy breaking or in the wet, I will fit the regulator.

Bit of a pain through, as some of the brake lines will need to be changed from single flare to double (or visa-versa) to change from a T to a regulator.

I hope you have got quick reactions.

 

If your rear brakes lock up in the wet under heavy braking a Mini can spin very quickly, and the results can be messy.

[Spider]

 

Spider, I am interested to see what you can confirm if you can check the old fiche.

As I would like to configure them as per factory as a starting point.

Thanks

 

OK sure, just give me about a week, I've a bit on my plate just at the moment !

 

 

Just had some time to sort through it almost !

 

From Car S20D101 to 19415A  Single Circuit, 7.5" Servo Assisted Discs, 5/8" Rear Wheel Cylinders, WL600041 Regulating Valve

 

From Car 19416A to 21569A  Single Circuit, 8.4" Discs (no servo), 11/16" Rear Wheel Cylinders, WL600041 Regulating Valve

 

From Car 21570A to ?????  Single Circuit, 8.4" Discs (no servo), 1/2" Rear Wheel Cylinders, No Regulating Valve

[richmondclassicsnorthwales]

Very good information !

[Chris1275gt]

Spider, I am interested to see what you can confirm if you can check the old fiche.
As I would like to configure them as per factory as a starting point.
Thanks

 
OK sure, just give me about a week, I've a bit on my plate just at the moment !

 
Just had some time to sort through it almost !
 
From Car S20D101 to 19415A  Single Circuit, 7.5" Servo Assisted Discs, 5/8" Rear Wheel Cylinders, WL600041 Regulating Valve
 
From Car 19416A to 21569A  Single Circuit, 8.4" Discs (no servo), 11/16" Rear Wheel Cylinders, WL600041 Regulating Valve
 
From Car 21570A to ?????  Single Circuit, 8.4" Discs (no servo), 1/2" Rear Wheel Cylinders, No Regulating Valve

Hi Moke
I've found a flow chart on Minispares website that has conflicting info with regard to the car from 21570A to ? They state a Single circuit, 8.4 discs (no servo) 1/2Rear cylinders , with a 21a1774 regulating valve. I have a single line no servo 1975 1275gt 24935a and wish to know are you or Minispares right as I want to put the correct set up on my car.