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Brakes
Sept 3, 2013 3:45:51 GMT
Post by sportsracer on Sept 3, 2013 3:45:51 GMT
I know brakes are important but how important? In any of your races do you need fantastic brakes or are good brakes OK?
Are caliper brakes just on the back wheels good enough or should I stick to my plan of building disk brakes for the front and caliper for the back?
Finding cheap 36 or 48 spoke hubs with disk brakes and large axles is impossible so I've ordered a pair of disk brake 32 spoke hubs that fit 20 mm axles. I was going to match these to 20" steel rims and fit them to the front of my cart. The problem is they are 32 spoke not 36 or 48 which I would like to run on the front. If I don't need front brakes then I can use 36 spoke wheels (which I have lots of) or buy some 48 spoke wheels.
For the rear I already have a pair of 48 spoke wheels.
I like the idea of having just caliper brakes on the back wheels. That would allow 2 brake pedals, one for each rear wheel which would help cornering. I could apply both brakes approaching the corner then slow down only the inside wheel (if needed) when in the corner to help settle the cart through the corner.
Has anyone tried this?
Cheers
Paul
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Brakes
Sept 3, 2013 13:10:23 GMT
Post by Scottish Cartie Association on Sept 3, 2013 13:10:23 GMT
As it happens I've been thinking about this for a while and have just published a piece about soapbox brakes on the SCA web site. The answer is - as usual - that it depends. On some courses you can get from top to bottom without touching your brakes, and if the braking zone after the finish is relatively level and long you might get away with quite poor brakes. If you need to brake a lot on the course, though, then the better your brakes are the better your time will be. We did a survey a couple of years ago and found that the most common configuration was to have disk brakes front and rear. Very few people were still running with just rim brakes on the rear wheels. It is really hard to get enough braking force with just rear rim brakes. If I were you I'd go for disk brakes on all the wheels.
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Brakes
Sept 3, 2013 21:46:57 GMT
Post by caisse433 on Sept 3, 2013 21:46:57 GMT
hello Sportracer
"That would allow 2 brake pedals, one for each rear wheel which would help cornering. I could apply both brakes approaching the corner then slow down only the inside wheel (if needed) when in the corner to help settle the cart through the corner."
I had this system in the year '83 and '84 ! its good, .....and no good !! as you say, to help the vehicle to turn in some corner, it's convenient, and sometimes as ESP system! but it also has a big inconvenience! in case of heavy braking in a straight line or curve, it can be problematic because getting an identical braking both wheels is complex and difficult! I went by after the 4-wheel brakes, but always with two pedals, but for the front and one for the rear, practical because it is easier to manage the braking system, but requires some getting used to! I keep this system for very long years, as I used drum brakes with brake pad different between the front and rear, more powerful front. but since I'm disc brakes, I had to abandon the system and no longer have a single brake pedal, but the pedal-box is on hand to manage the distribution front to rear
jacques
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Brakes
Sept 5, 2013 11:59:57 GMT
Post by Scottish Cartie Association on Sept 5, 2013 11:59:57 GMT
caisse433 - how do you test your brakes? In the UK we normally do a test to make sure they can hold against a measured force which is usually 50KgF but can be higher on steeper courses. Do you do any similar tests in Belgium?
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Brakes
Sept 5, 2013 15:04:00 GMT
Post by caisse433 on Sept 5, 2013 15:04:00 GMT
no,we haven't similar test in Belgium ! just at the first race, a test on a track,and also at the européen championship it's the same too . but 75/100 soab box are with disq brake from MRX or Sejkora (http://sejkora.cz/products/ ) but your system is better jacques
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