Master cylinder

[ed325i]

I am going to do away with the servo and was going to fit twin masters but will this be up to the job with an adjustable brake balance valve in the rear brake line ?

Here >> http://www.rallydesign.co.uk/catalog/pr ... s_id=10444

Thanks Ed

[blitz877]

yeah it will be fine mate just press the brake pedal harder

[ed325i]

As long as its up to the job.

Ed

[agreen]

is this the same as fitting an e30 m3 master cylinder ?

[UweM3]

is this the same as fitting an e30 m3 master cylinder ?

no that's something completly different. disconnect your vaccum pipe from the servo and drive (carfully!!!) round the block and you get the idea.
Of course this is only a rough comparision, a proper set up master MS will behave differntly becuase it is sized to work without the servo. But you still need a firm foot.

[agreen]

so whats the advantage of either of the options then

[maxfield]

Better braking control.

[agreen]

Better braking control.
_________________

in both options >?

[shorty73]

Sorry to hijack but I've just fitted a 25mm (750i) MC to mine. I was going to remove the exsisting pressure regulator and replace with a rear bias adjuster. Is this a good idea or should I just leave as is. Renewing the lines anyway so no hardship.

[ed325i]

Sorry to hijack but I've just fitted a 25mm (750i) MC to mine. I was going to remove the exsisting pressure regulator and replace with a rear bias adjuster. Is this a good idea or should I just leave as is. Renewing the lines anyway so no hardship.

It depends if you want to be able to adjust the balance ?

[agreen]

why would you want to do this ed?

[BadDave]

why would you want to do this ed?

To adjust the braking to the front or rear wheels depending upon which type of road surface your driving on to provide optimal braking for any given road/track condition

[Yaninnya]

Are you a rally or racing driver?
Jan

[BadDave]

After having a look at the RD website.I'd say you might be overbraked at the rear
If that is indeed the case,you'd need to fit a proportioning/bias valve in the line to the rear brakes to reduce the pressure

A better setup would be twin master cylinders (1 for front and 1 for the rear)and a balance bar(infinately adjustable up to a point) to get your optimum brake balance

[shorty73]

I'm a Race Driver. This is the one I've gone for. If you look at the pdf it shows how it effects the braking.

http://www.tiltonracing.com/content.php ... &id=37&m=b

"The dual-slope line gives the proportioning valve one advantage over the balance bar
system. It can be tuned for a better front-to-rear brake balance under both light and
heavy braking."

It depends if you want to be able to adjust the balance ? Yes ed I do but I wondered if anyone had done this and thought it not worth it.

[BadDave]

I used to use the Wilwood version on an old Ford once i'd converted the rear to disk brakes

[Yaninnya]

Yes ed I do but I wondered if anyone had done this and thought it not worth it.

In most of my rally and racing cars I used to have a proportioning valve or dual brake master cylinders. But in real world you need to really know what you are doing. Specially in the begininng adjust it too much to front. When you will learn to recognize the surface you can add more to rear wheels during adjustment.
Jan

[shorty73]

Cheers Jan. The Info I need.

[oze30]

I run dual MC and Uwe knows how it stops. Yes, it needs a firm foot but I think I could stop better if not the same as with a servo. And thats hauling down a 4.0l V8 and an LPG tank on stock M3 brakes. Modulation is heaps better and locking up- I've done it once or twice in the wet, NSR for some reason. on akk occasions. Yet to lock a front. This was all balanced out on a bias bar via one side of the car jacked up and spinning the wheels till they both spun, and adjusting it if it didn't. It could prolly do with some more rear if anything, but it stops fine for me!

Ed, if your going twin MC, then use one for the front and one for the rear. Easiest method. Simple. No need for bias valves etc. prob is stopping the whole lot flexing under emergency braking!!

[UweM3]

I run dual MC and Uwe knows how it stops. Yes, it needs a firm foot but I think I could stop better if not the same as with a servo. And thats hauling down a 4.0l V8 and an LPG tank on stock M3 brakes. Modulation is heaps better and locking up- I've done it once or twice in the wet, NSR for some reason. on akk occasions. Yet to lock a front. This was all balanced out on a bias bar via one side of the car jacked up and spinning the wheels till they both spun, and adjusting it if it didn't. It could prolly do with some more rear if anything, but it stops fine for me!

Ed, if your going twin MC, then use one for the front and one for the rear. Easiest method. Simple. No need for bias valves etc. prob is stopping the whole lot flexing under emergency braking!!

yep I was really surprised how good it stops even on the stock E30 brakes! Didn't realise that was without servo! We need to have a chat.....

[oze30]

any time. and finally saw your car. NIIICE!!;)

[ed325i]

What size m/c 's will I need ?
Alcon list
0.625
0.7
0.75
0.812
0.875

[oze30]

depends on your stoppers. I had a setup with twin .75 I think. But keep in mid im running e30 M3 brakes

[ed325i]

I am using the standard 323 brakes with are the same as the 325.

[oze30]

Best thing to do is speak to a racing specialist. The setup i got was from another guy running the same brakes, so he did all the homework.