I think I have seen this before ..but with ZZ Top
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| Motokhana Turning Brakes https://www.ausmini.com/forums/viewtopic.php?f=2&t=44123 |
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| Author: | Joe [ Tue Jul 22, 2008 8:54 pm ] |
| Post subject: | Motokhana Turning Brakes |
Browsing youtube the other day I came across this mad mini doing a very impressive motokhana run! http://youtube.com/watch?v=Uwzlu5mPCuc I have heard of a handbrake style leaver being set up to brake front left or front right to corner like this mini does (how cool is that!) I was just curious if anyone knew how this worked, or if anyone had done it, or have pictures of the setup. It might be something to have a little fun with when I finish my van... |
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| Author: | benoz [ Tue Jul 22, 2008 9:02 pm ] |
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yes everyone, it's that yellow cooper again! First time I've seen a sensible thread started about it though... |
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| Author: | gafmo [ Tue Jul 22, 2008 9:14 pm ] |
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I think I have seen this before ..but with ZZ Top
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| Author: | 1310/71 [ Tue Jul 22, 2008 9:42 pm ] |
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Most use two master cylinders set opposite so the lever will activate either one depending on which direction they move the lever - but I think you'll find they operate on the rear wheels to swing the car around, leaving the front ones to keep driving forward. KB |
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| Author: | Joe [ Tue Jul 22, 2008 9:59 pm ] |
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I understand the two master cyl thing, but pushing fluid into the lines would also push the fluid into the "main" brake master, which I would imagine would cause all kinds of grief with seal wear and overflowing the main reservoir. It has been a while since I played with master cylinders... I would have thought they would put it on the front. Stopping one wheel at the front would allow the other wheel to pull the rest of the car around wouldn't it? Unless you had an lsd... That would just get messy! I don't understand the benefit of stopping one rear wheel... Watching that clip it looks like the front inside wheel stops while he turns... |
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| Author: | 1310/71 [ Tue Jul 22, 2008 10:11 pm ] |
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Yes I think you're right, The setups I was thinking of were rear wheel drive motorkhana specials. |
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| Author: | simon k [ Tue Jul 22, 2008 10:48 pm ] |
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lots of us have hydraulic handbrakes on our rear wheels, but in that case, I believe it would be set up with 2 brake pedals (& 2 master cylinders), only acting on the front wheels - one for the left, one for the right, and when you mash them both, you get stoppies like that one |
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| Author: | Joe [ Wed Jul 23, 2008 6:06 pm ] |
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What if I got 2 12v, 3/16th hydrolic solenoids that blocked off the line when power was applied, one on the front left, one on the front right. Put a fuse in the wire to the switch (of cource) so its easily disabled for road use. Switching the switch left will block off the right front brake and vice versa. Center position on the stwitch brakes as normal. Get one of those covered switches so you dont bump it while driving normaly... Would be much easier than fabricating duel pedal box and masters (and much more sensible for road use) and still very effective. Easier to use too I'd imagin. And less of a brain F#@$ getting use to driving with two brake pedals. Does anyone see a problem with that? With the fuse removed, would a police man still have a problem with it? |
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| Author: | mugginsmoo [ Wed Jul 23, 2008 6:27 pm ] |
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another way of doing it is to use clutch "slave" cylinders. you put the "in" line into the "bleed" & the "out" line goes into the clutch "in" you will also have to put a stop on the leavers, or when you put your foot on the break. the levers will "push" out (just the same as if you didn't have the clutch arm attached to the mini!) with this system you can just "bleed it" as a normal breaking system. Mitch |
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| Author: | Bubbacluby [ Wed Jul 23, 2008 7:50 pm ] |
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just use two handbrakes and have one cable going to each instead of both going to one. couldnt be that hard |
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| Author: | Joe [ Wed Jul 23, 2008 7:50 pm ] |
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What about hooking it up to the front brakes? would you use another caliper? or drums would you use like a duo servo setup? I dont really understand what you mean with the clutch slave... woud you use the same pedal? same master? I'm still stuck on using the same master with the fluid pumping back into the master, blowing out the end seal, leaking out the dust boot and overfilling the resivouir Bubbacluby wrote: just use two handbrakes and have one cable going to each instead of both going to one. couldnt be that hard
that would brake the rears wouldnt it? |
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| Author: | simon k [ Wed Jul 23, 2008 10:33 pm ] |
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Joe wrote: What if I got 2 12v, 3/16th hydrolic solenoids that blocked off the line when power was applied, one on the front left, one on the front right. Put a fuse in the wire to the switch (of cource) so its easily disabled for road use. Switching the switch left will block off the right front brake and vice versa. Center position on the stwitch brakes as normal. Get one of those covered switches so you dont bump it while driving normaly...
this would be the way to do it.... I've thought of the same, but not on a road car. You'd want to be cleverer with your switching than that, but the principle is sound |
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| Author: | Joe [ Wed Jul 23, 2008 10:40 pm ] |
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more clever to make it more obscure for the boys in blue to pick me up on? or more clever to make it work better? I _think_ I can hide solenoids, and the switch would be hard to work out what it does, specially if there was a switch turning off the switch so I dont bump it... |
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| Author: | simon k [ Wed Jul 23, 2008 10:50 pm ] |
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Joe wrote: more clever to make it more obscure for the boys in blue to pick me up on? or more clever to make it work better?
I _think_ I can hide solenoids, and the switch would be hard to work out what it does, specially if there was a switch turning off the switch so I dont bump it... I mean cleverer in terms of how you switch it when you're making a turn, having a switch on the dashboard can't be reached in a 'khana, having it on the steering wheel isn't practical as you can't keep your hand in one place on the wheel... actually having it as a positional switch might be a pain because you have to turn it on, and then off again. So you want a pressbutton, maybe set it up so that you press the button for the side you want to turn off, and use another switch on the brake pedal that disengages the solenoid when the pedal is released.... I'm not telling what my plan is... 
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| Author: | doogie [ Wed Jul 23, 2008 10:59 pm ] |
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Whats wrong with a simple hydrulic handbrake? They work for me!!! What is this car going to be used for? Doogie |
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