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Old 01-07-2020, 08:16 AM
Ironmattman16 Ironmattman16 is offline
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Default Need help buying brakes!

I am building a high efficiency go kart for a highschool electric car team and need some help finding a brake caliper with retracting pads.

I have bought a super cheap mechanical caliper, not realizing that unlike the bike disk brake calipers i'm used to they do not retract, I then went out and bought a hydraulic set, once again not knowing that the pads are meant to rub until they are pushed away.

I need a set that will fully retract off the disk to minimize friction, I've looked at the will wood offerings but am hoping for a cheaper alternative that I haven't found because i don't know what to look for.

I also have the master cylinder from an old racing caliper set, will that have the power to suck the pads back in? thanks for any help possible.
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Old 01-07-2020, 12:38 PM
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JTSpeedDemon JTSpeedDemon is offline
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Are these bicycle calipers? Also, do you have a return spring set up?
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Old 01-07-2020, 03:18 PM
mckutzy mckutzy is offline
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Lets see some pic of the brake setups you have ....
Might be a way to retrofit a spring return onto them...
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Old 01-09-2020, 12:29 AM
madprofessor madprofessor is offline
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Default Try a different type?

Have you considered a good ole fashioned scrub brake instead? Who says it has to be a disc setup? The earliest karts primarily had scrub brakes, a flat steel plate that pressed against one of the rear tire's tread, or two of them on the two rear tires working from the one brake pedal. Simply operated by hard linkage, with a common type spring hooked anywhere in the linkage that'll pull back on it when you let up. Zero drag when not deployed.
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Old 01-09-2020, 07:52 AM
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with madprofessor. Scrub brakes were commonly seen on vintage karts. My go kart has a scrub brake setup, and contrary to what people may tell you, they can actually *almost* lock up the rear wheels, and aren't too hard on the tires. Mine can lock up the non-driven rear wheel, and it could probably lock up the drive wheel as well as long as the clutch isn't engaged.

They're also very reliable, with very few parts to break.
The one drawback is that scrub brakes limit wheel and tire size options.
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