Another brake thread, long peddle, but read before commenting

[subarooboy]

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[Denver]

Originally Posted by dtrally

It's normal for the pedal to sink further when the car's running, that's the function of the booster. With the car off, it should take about 3 pedal applications to deplete the booster's vacuum supply, if not you are probably missing the one way valve. Once the vacuum's gone you should have a rock hard, no sponge pedal. Is this the case?
Is the car 'B' rego (it probably should be with a hyd h/brake anyway) if so, throw the whole lot away (master cylinder & booster) and fit a twin master cylinder pedal box with balance bar. Than you'll have consistency with antilag on and infinite bias adjustability.

Group N rally car, we can't ditch the master cyl, or it'd have been shown the door at the beginning, itd also make my life a whole lot easier..

we're suspicious of it being a vacum problem, but it just seems a little odd..

theres no one way valve in the line form the manifold, checked this on two cars, <97 sti> so im guessing its either in the manifold or the booster itself..

as for race brakes, spoke to them yesterday...

[dtrally]

Originally Posted by Denver

Group N rally car, we can't ditch the master cyl, or it'd have been shown the door at the beginning, itd also make my life a whole lot easier..
...

Ummmmmm.....you can't exactly do the mods you've already done then.
No hydraulic handbrake for group 'N' unless you get the homologated $$$$ one for 2005 onwards. You'll be fine for Dutton, but forget about Targa west.

[Denver]

got told today the cars going PRC rules anyway, which opens things up a little, if it comes to issues like that for targa tho, we'll revert back to the stock setup

[Andy]

prc, easy fix nug, just put a pedal box in it :P

[dtrally]

PRC means category M4 for Tarmac = 34mm turbo restrictor booooooo!!

[Denver]

looks like it was a pile of air int he handbrake cylinder, hopefully anyway, saddly im not home atm so ivan will give her a test later this week and see how she goes..