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Old Streetfighter Motorcycle Forum Post 01-27-2020, 12:04 PM   #1
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Default Proper braking power vs. overkill

I'm putting together a 79 Kawasaki KZ1000 (zed for you Brits). It has the MkII engine, which I'm just about to assemble. It is stock size but with new pistons and I've had the head ported and flowed with nitrous injector plates installed. Just a little bit of a sleeper approach.

Any way, the bike originally came with twin discs and those fantastic round single piston brakes they had back then. In order to reduce unsprung weight I want to go with one disc using a single disc like an EBC with a Harrison Billet four piston caliper and the appropriate master cylinder.

Does anyone think that won't be sufficient braking power? I'm not planning on riding it like an insane person every time I get on it. Just, you know, now and again.
It seems like two of those Harrisons would be over kill.
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Old Streetfighter Motorcycle Forum Post 01-27-2020, 02:01 PM   #2
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Default Re: Proper braking power vs. overkill

fit the modern brakes, originals need a written letter of intent before they,ll stop you. modern ones will only grab as hard as you ask
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Old Streetfighter Motorcycle Forum Post 01-27-2020, 02:33 PM   #3
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Default Re: Proper braking power vs. overkill

what Yan said

"its better to HAVE and not need, than NEED and not have!!"

SHIT HAPPENS!!!!!
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Old Streetfighter Motorcycle Forum Post 01-27-2020, 04:34 PM   #4
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Default Re: Proper braking power vs. overkill

There's all sorts of ways to get calipers to pinch pads again rotors. The biggest issue with lots of old bikes was shitty metallurgy regarding the discs. You can pinch there hell out of them, but the pads just can't grip the rotors with enough friction to do anything.

Modern bikes have that all sorted out.
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Old Streetfighter Motorcycle Forum Post 01-28-2020, 02:18 AM   #5
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Default Re: Proper braking power vs. overkill

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Originally Posted by shinyribs View Post
There's all sorts of ways to get calipers to pinch pads again rotors. The biggest issue with lots of old bikes was shitty metallurgy regarding the discs. You can pinch there hell out of them, but the pads just can't grip the rotors with enough friction to do anything.

Modern bikes have that all sorted out.


I second this. I've swapped a load of calipers onto older 70's and 80's rotors with absolutely nothing but a sore hand from gripping brake lever, to show for it. Fitting up modern brakes to any older bike (caliper, rotor, master cylinder) is better than anything else you could do in an attempt to make those old rotors worth a damn in any situation you may need to slow down quickly. Your stopping power is only as good as the tire anyway, so you may as well run a brake that can use the tire to its very limits.

As far as brakes go, I feel like there is no such thing as overkill. The more powerful a brake system is, the smoother and more effective it seems to be. My 900RR brakes were something else, as were a few others of note, and I couldn't go back to drums or even those horrendous puck type pad 70's brakes ever again.

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Old Streetfighter Motorcycle Forum Post 01-28-2020, 03:06 PM   #6
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Default Re: Proper braking power vs. overkill

Brakes can never be too much. I get that you want to go period correct. But brakes can never be too much

1-0-1-1-0-1-0-0-1-0-1-1-0-1-0-0-1-0-1-1-0-1-0-0-1-0-1-1-0-1-0-0-1-0-1-1-0-1-0-0-1-0-1-1-0-1-0-0
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Old Streetfighter Motorcycle Forum Post 01-28-2020, 03:09 PM   #7
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Default Re: Proper braking power vs. overkill

Quote:
Originally Posted by yantosh View Post
fit the modern brakes, originals need a written letter of intent before they,ll stop you. modern ones will only grab as hard as you ask
I am fitting them. Just trying to decide if one is enough. One way to find out, I suppose.

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Originally Posted by Jokermachine View Post
I don't remember why I forgot about it.
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Old Streetfighter Motorcycle Forum Post 01-28-2020, 03:12 PM   #8
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Default Re: Proper braking power vs. overkill

Quote:
Originally Posted by shinyribs View Post
There's all sorts of ways to get calipers to pinch pads again rotors. The biggest issue with lots of old bikes was shitty metallurgy regarding the discs. You can pinch there hell out of them, but the pads just can't grip the rotors with enough friction to do anything.

Modern bikes have that all sorted out.
Quote:
Originally Posted by RatFighter View Post
I second this. I've swapped a load of calipers onto older 70's and 80's rotors with absolutely nothing but a sore hand from gripping brake lever, to show for it. Fitting up modern brakes to any older bike (caliper, rotor, master cylinder) is better than anything else you could do in an attempt to make those old rotors worth a damn in any situation you may need to slow down quickly. Your stopping power is only as good as the tire anyway, so you may as well run a brake that can use the tire to its very limits.

As far as brakes go, I feel like there is no such thing as overkill. The more powerful a brake system is, the smoother and more effective it seems to be. My 900RR brakes were something else, as were a few others of note, and I couldn't go back to drums or even those horrendous puck type pad 70's brakes ever again.
Quote:
Originally Posted by rex_saugerty View Post
Brakes can never be too much. I get that you want to go period correct. But brakes can never be too much
Gents,
I appreciate the input, but I've already decided to fit the modern disc, caliper and MC. What I'm trying to decide is whether one modern brake is sufficient. I'd like to reduce unsprung weight and I'm thinking that one Harrison caliper and modern disc is more than twice as good as two of the old POS brakes.

Credo quia absurdum est, baby.

Jokers to the left of me, clowns to the right....

Faster horses, younger women, older whiskey, and more money.

If I wanted to lick a hippie I'd return Joan Baez's phone calls. - Jack Doneghy

Quote:
Originally Posted by Jokermachine View Post
I don't remember why I forgot about it.
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Old Streetfighter Motorcycle Forum Post 01-28-2020, 03:19 PM   #9
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Default Re: Proper braking power vs. overkill

Get the biggest rotor you can find then

1-0-1-1-0-1-0-0-1-0-1-1-0-1-0-0-1-0-1-1-0-1-0-0-1-0-1-1-0-1-0-0-1-0-1-1-0-1-0-0-1-0-1-1-0-1-0-0
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Old Streetfighter Motorcycle Forum Post 01-28-2020, 03:21 PM   #10
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Default Re: Proper braking power vs. overkill

The problem you can come across, is one single modern disc will work really well right up until the heavy high speed bike with a strong caliper overheats and warps it.

I'd recommend dual discs just for that reason.

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