Brake proportion rear disks.

[twinturbo]

How do people set the rear disk balance to prevent them locking?

Do you just use a Drum brake valve? or a bias bar?

Do you use the small drum brake master cylinder and put up with the pedal travel, or use the 25mm ( RARE!! ) XR4x4 non abs cylinder?


Has anyone used the Pumped master cylinder from an ABS car without using the rest of the ABS system?

TT

[flyerncle]

Spuds car went through SVA no probs with standard rear drum/front disc setup,on the other hand others have had problems with front to rear balance and had to swap cylinders etc.
The abs pump is to large as has been discussed before on here so its probably sensible to go for a standard setup and modify after IVA to avoid headaches.
If you want a bias bar setup do it later as they have to be locked,make two brake plates.

[twinturbo]

So disk rears could be a problem?

Main reason for asking is the cost of rear uprights and having to swap if there's an issue.

TT

[flyerncle]

Possibly,you could fit reducers inline to loose a little rear pressure, and adapters are available for the uprights for disc's/from drums(3GE do them cheap) I have the uprights and will fit drums for test and then replace them after.

[alga]

Worth mentioning, the only Roadster that passed IVA needed drum brake cyliders downsized.

[twinturbo]

So what's everyones plans?

How many have failed the IVA

How many have passed the SVA?

TT

[les g]

Adrian
it would appear the wallet is the limit with brakes
i think upgrades are more about heat dissipation and survivability of brakes in racing conditions
also things like lightness of pedal/pedal effort/driver fatigue.
speed of brake application and release.
and also lightening of brake assemblies to reduce unsprung weight etc
you cant get better braking than if you can lock all the wheels which is obviously achievable with a sierra set up
its the other bits that people are looking at
cheers les g

[Talonmotorsport]

Has any body thought about using the load sensing valve from an escort van? It can be made to be adjustable with a 2 lock nuts and a bolt,mounted in the engine bay near the master cylinder would make it more accessable than a bias bar which needs to be welded come IVA time.

[Bonzo]

Originally Posted by Talonmotorsport

Has any body thought about using the load sensing valve from an escort van? It can be made to be adjustable with a 2 lock nuts and a bolt,mounted in the engine bay near the master cylinder would make it more accessable than a bias bar which needs to be welded come IVA time.

Must admit. The thought has crossed my mind

I'll be able to have the chance to ballance my brakes on the rolling road prior to my IVA ............ Or whatever the test is called in a few years time

[les g]

Adrian
the only benefit of rear discs i can remember from my college days
(dont laugh )
were unsprung weight and lack of brake fade and less parts of course
i cant remember any thing else
cheers les g