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#Post#: 1050--------------------------------------------------
Brakes
DIR By: Slack Alice
Date: July 14, 2019, 4:39 pm
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I need to seriously upgrade my braking system. It will have to
be hydraulic...any good recommendations?
#Post#: 1051--------------------------------------------------
Re: Brakes
DIR By: RhysN
Date: July 15, 2019, 1:58 am
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Why does it have to be hydraulic? That's only the actuating
system.
Anyway, the biggest issue is that the master and slave cylinders
come from the same unit. There are plenty of motorcycle rear
hydraulics.
A disc with the ability to shed heat, so size, thickness etc
that's compatible with the caliper, big and thick as you can.
The mountain bike one you had/have was going to be a parking
brake, or back up had I used one.
BTW David I was with Thunderbug yesterday, definitely yellow and
black (not dark blue as we discussed)
#Post#: 1052--------------------------------------------------
Re: Brakes
DIR By: Slack Alice
Date: July 15, 2019, 3:10 am
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I’m really envious! Thunderbug in the flesh!
#Post#: 1053--------------------------------------------------
Re: Brakes
DIR By: RhysN
Date: July 15, 2019, 3:43 am
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It was like being a kid in a candy store. I only watched about 3
cars go up the hill.
Laugh of the day (and OT) was the commentator who said that the
White "must have a badly blown head gasket" It's a steam car and
the exhaust...
Back to brakes. The Freikaiserwagen, had one cable operated drum
brake, always had, always will do. (That's another one to look
up :) )
#Post#: 1054--------------------------------------------------
Re: Brakes
DIR By: chrisenamels
Date: July 15, 2019, 6:07 am
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I'll second your "kid in a candy store" comment Rhys, Saturday
was mind boggling. Photos of Thunderbug, and the rear end of
Freikaiserwagen attached.
#Post#: 1601--------------------------------------------------
Re: Brakes
DIR By: StefanN
Date: November 6, 2019, 12:18 pm
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It would be helpful to get a feel for what brake set-ups people
are using. With this being such a critical component the more
understanding we can get of what works the better. Please could
you share the following any information you know about your:
Master cylinder/piston (bore/stroke)
Calliper (make, number of pots, bore)
Pads
Disc diameter, thickness, design
(slotted/drilled/dimpled/vented), material and carrier
Number of discs
Any ventilation to the discs
Plus any comments on performance.
What it was designed for
Photos and links to anything you've bought would also be
helpful.
#Post#: 1605--------------------------------------------------
Re: Brakes
DIR By: GeoffM
Date: November 6, 2019, 4:36 pm
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Check out 20180201151146 on youtube it may help, although I have
changed the front brakes to hydraulic as the cables would pull
when turning. I used motorcycle clutch slave cylinders to
operate the mechanical levers,cheers, Geoff
HTML https://youtu.be/N09ejgUD_Gk
#Post#: 1606--------------------------------------------------
Re: Brakes
DIR By: Little French
Date: November 7, 2019, 4:53 am
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Hello all,
Personally I tried both systems (mechanics on my 1st CK then
hydraulics on my second)
For my 3rd, I'm planning the mechanical system.
In fact, the braking of our Ck is a false problem, either it is
effective and the wheels blocked by our Ck are light enough
Either the braking system is ineffective, and the result is the
same
By return of experience:
The hydraulic type is difficult to adjust, and the stroke of the
piston is relatively short, which requires a precise adjustment
between the disc and the pads (not always easy to obtain with
our CK "DIY")...
For the mechanical type to give complete satisfaction, several
essential things must be done
1 large brake pads
2 A disc of large diameter
3 A great race that allows a moderately precise adjustment
4 Easy adjustment of the stroke of the brake pads
here is the model of brake caliper which gives me satisfaction
for a very correct price
I used this model on 2 other Ck built for friends, and so for my
next Ck too
All this is only my point of view, and therefore questionable
.... ;)
[attach=1]
PS : This model has 2 cable tie, so 1 for the foot brake, and
the other for the parking brake!
#Post#: 1607--------------------------------------------------
Re: Brakes
DIR By: ChrisS
Date: November 7, 2019, 7:55 am
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I've got a Gemini 10inch disc and a Gemini mechanical caliper
which is operated by a 6mm rod from the pedal.
It easily locks when only driving one wheel, but with both
wheels being driven it hasn't got the power to lock them up, so
it would be nice to have just a little more.
#Post#: 1610--------------------------------------------------
Re: Brakes
DIR By: RhysN
Date: November 7, 2019, 10:06 am
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I have tried whatever has been available!
Remember that either hydraulic or mechanical has no effect on
the performance of the brakes, it's just an operating system,
and hydraulic is usually more difficult to get right. First up
is that the master and slave cylinders MUST be matched as a
system, unless of course you are able to get all the maths right
without experiment, and that's pretty specialised. So, if you
are going to get some old motorcycle parts, get both the master
and slave.
Then you have the leverage ratio on the pedal to the system.
Brakes for a CK often need to be different to a go kart type,
wheel diameters are not the same, and according to a brake
designer that is a huge factor, even with the same weight of
vehicle, all relates to the torque applied by the wheel, so our
wheels, overall diameter of around 25" are vastly different to a
go kart where the overall diameter is about 10", and it's some
sort of mathematical ratio, not just a factor of 2.5. I guess
that's why motorcycle systems are a better solution?
The disc has to get rid of the heat, again all very well to get
cool air to the disc, but unless the heated air can escape you
gain nothing. Just like getting cool air to the engine.
More mass in the brake disc(rotor) will absorb more heat and
radiate it more quickly so less fade, bigger pads = less fade,
slots, cross drill etc also help dissipate heat, but not as well
as more disc mass. More diameter helps too. Extra calipers on
the disc is a negative help, as it simply shields the disc more.
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