10 replies to this topic

[Mr-Zorro]

1977 Clubby

Im in the process of overhauling my brake system and have replaced the 8.4" disc's for 7.5". Now im replacing all the lines, master cylinder and pressure regulator thingy

Ive always had trouble with my brakes and after endless bleeding and replacing parts ive decided to renew everything instead of messing with replacing mre bits and second hand parts.

To the point....I want to change the single line system to dual line and was wondering apart from the master cylinder and the pressure vavle that I will have to put on the bulk head will it be rather easy to do without to much change?

At present the line runs from the master cylinder to the t-piece on the bulk head then splits to the front though the pressure switch on the front subframe and around the front to the calipers. Then to the rear running through the pressure regulator valve to the rear drums.

The only thing im not to sure of is the pressue switch I have on front subframe for the brake lights will it be ok in a dual line system or will i have to change the brake pedal for a later type with the contcts on the pedal for the lights.

If anyone could help me out and let me know what I need to do that would be great as I dont want to be buying lines and find out its wrong.

Thanks

[MRA]

Right so it isn't standard ...... as far as I know your shell is not a 1275GT so would have been fitted with drums originally, now this shouldn't cause any issues as all the bracket points should be on the shell for the later dual line brakes.... look on the bulkhead just under the brake master cylinder is there a valve or a coulle of bolt holes for a valve to be fitted ?

All else will be plain sailing

[Mr-Zorro]

No the brakes are not standard when I got the car we convertd the front drums to disc's but everything else is as it was/should be. Picture below is the T piece I have on the bulk head which splits the line front and back but no sign of any other holes where I can fit the dual line regulator bias vavle.

 DSCF3534.JPG   998.89K   10 downloads

Thanks

[MRA]

Now the T piece above is fixed using the same fixing point as the proprtional valve, this would then allow you to plum in the twin system, the T piece can be fitted to the rear subframe where the bias valve is currently fitted.

[Spitz]

This article may also shed a little light
http://minispares.co...x?ty=ad&aid=127

[Mr-Zorro]

I see I see, had a look at that article on minispares had to read it a couple of times though to get my head around it all. Even now im not sure if I get all of what it says lol.

So changing to the dual line system is quite straight forward. If I wanted the servo type master cylinder would this involve more holes in the bulk head?

[Spitz]

I think the early servo fits on the inner wing.......I think the later servo with built in master connects to the fitted studs plus one captive nut up on the rear of the dash panel. ( not 100% sure )

[Mr-Zorro]

Yer the early remote type fits on the inner wing and is fitted as an addition. At first I was going to replace all my single line system and get a remote servo as it would be period to my car then I thought the twin line system on its own would be as good, now im thinking maybe the later twin line system with built in servo as the spi's and mpi's have.

Not really sure what peoples opinions are on this? Im just looking for the best brakes with not to much modifications to the body work?

[Ethel]

You shouldn't have to modify the body at all. You can retain the rear valve too. Just extend the line to the rear from the 3 way union to one outlet on the master and the front line to the other outlet. Do a little research to connect the right circuit (front or rear) to the right master outlet, it wouldn't usually make very much difference but it will if you use the "yellow band" master.

The horizontal master will bolt to the earlier pedal box, but it might be easier to grab the whole setup if you have the option.


A post 1976 Mini should have dual circuit brakes, does it have the big subframe tower bolts?

[Mr-Zorro]

Im guessing my car was manufactured during the change of subframes and brake systems. As I have the later type subframe with 2 tower bolts as apose to 4 but only a single line system and my car is 1977. Im guessing they used what they had left over in the factory so its a single line system but with the later subframe.

But I want to replace the lot anyway and was not looking to keep anything as I think the Bias vavle on the rear subframe is at fault causing my not so good brakes.

[Ethel]

I think it's more likely the master was changed along with the discs in place of the original drums (if it's not a 1275GT). The dual circuit brakes were to meet regulations.