brake calipers
hi all, Ive a question about G wagen calipers, as some of you may know I'm converting one of my G wagens to 4-wheel steer using a front axle at the back, the axle I got has the twin feed calipers, as does my original front axle, my question is what way do the twin feeds work, I don't think its one feed per "side" of the caliper, if I blank one feed and connect the other will only half the caliper work, or only one piston per side, or is it irrelevant?
what do you guys think, what way should I plumb them?
bear in mind it will never see more than 30mph, and probably never on road
mick the digger,
I am not fully sure of how the calipers are internally connected up, nor have I ever come across such information, but in the spirit of thinking split braking; for safety reasons the principle relies in designing in safety by maintaining some braking than none at all, should one of the circuits fail.
Based on that, I would say each of the brake pipe feeds would be diagonally circuited to one piston each side of the caliper. With that balanced braking can be maintained but at 50% efficiency as opposed to 100%.
Therefore, I would suggest plumbing the pipe work. How you going to achieve this I can not at the moment say. I need more in put my self.
Regards,
They will be fed to opposing pistons with links internally.
You are on the rear braking so will need 50% or less plus variable braking ratios.. so what I would do is to only use one hose via a pressure reducing valve (the original one?).. maybe adjustable valve from Demon Tweaks if I wanted to be very correct.
Then fit a hydraulic handbrake and use the second circuit/line for that..
Transmission handbrakes nasty .. too many LR prop splines killed from those plus you have to balance them better as they are at higher rpm... plus technically if you lost grip on one wheel you could lose the handbrake
Handbrake at wheel is better but .. probably not legal for MOT with hydraulics?? (well you might want to...)
that's interesting about transmission handbrakes,In theory then if you brake a rear half-shaft on a lr (as you would :cry: ) you've got no handbrake!
It just seen as it was the simplest way to put a secondary braking system on it, I didn't want a system that if I tore a rear brake line I lost foot brake and hand-brake.
I'm going connect the twin feeds on the calipers for separate hand/foot brake, I suppose in a normal road use situation this would lead to this would lead to irregular wear across the length of the pad, but for the amount of use, and the speed it will be used at, I think it would take a long time two be an issue on this vehicle
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cheers mgrays, that's exactly what I was hoping I could do, use one port on each rear caliper as a hand brake, and the other port for the foot brake.
don't think Id need a proportion valve as Its only for slow speed off roading, but It wouldnt be an issue to add one later should it be needed.
had original planed on using a transmission h/brake on the rear prop, but where Ive had to put a cross member for the suspension links I haven't really got room for a disc on the output of the t/box.