Nova rear brake lines - why a pair?

[Johnny A]

I was thinking about the Nova's rear brake line setup, why is there two lines directly from the master cylinder to the rear brakes.

I am used to working on Carlton's and they run a single line from the front and a split at the rear.

Can anyone see why I couldn't connect the two lines at the master cylinder and split it when it gets to the rear beam?

[Royston]

It is for split braking the system is split into two circuits e.g. LH front/RH rear - RH front/LH rear if one circuit fails the car in theory will brake in a straightish line, with reduced performance of course.

My Rover Vitesse V8 has a single line for the rear brakes

[Johnny A]

Ahhh yes I forgot out that!!

Reason I ask is because I am fitting rear discs and there is the usual brake bias issues, I have an adjustable bias valve kicking about... but only the one

[mowgli]

people have fitted a single line from the gm master cylinder, with mixed results.

you could get a 2 line load sensing valve off something like an astra (or some of the corsas) pipe it up as per the factory does, and then modify the sensing mechanism with a bolt to make a dual line bias valve..

[dgbnova#1]

people have fitted a single line from the gm master cylinder, with mixed results.

you could get a 2 line load sensing valve off something like an astra (or some of the corsas) pipe it up as per the factory does, and then modify the sensing mechanism with a bolt to make a dual line bias valve..

I did see this under my 1.8 I'm scraping and thought exactly that so this had been done before?

[mowgli]

it dawned on me some years back when i had an astra that suddenly started braking with a massive rear bias, so much so that it could kick the back end out when braking on the slightest of bends & i found the spring was hanging off..30 seconds work remedied it, but the idea has stuck with me..

[odd brake bias fact] bmw ran a really clever bias brake on its touring cars in the 90's, it involved a large pendulum that altered the bias side to side in relation to cornering g forces, it then put more braking on the inside rear wheel to help cornering speed..