Rear brake return spring - Yamaha R3 Forum
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post #1 of 7 Old 12-19-2018, 12:01 AM Thread Starter
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Rear brake return spring

Is it necessary to have a rear brake return spring? Just installed aftermarket rearsets but it removes the stock springs. I've read people have used graves return spring but it doesn't say R3 are compatible?
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post #2 of 7 Old 12-19-2018, 08:44 AM
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Originally Posted by sLing View Post
Is it necessary to have a rear brake return spring? Just installed aftermarket rearsets but it removes the stock springs. I've read people have used graves return spring but it doesn't say R3 are compatible?
I don't run one on mine....It will make your pedal a little slower in response....That being said, I have the aftermarket reservoir delete and rarely use the rear brake.
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post #3 of 7 Old 12-21-2018, 01:32 AM Thread Starter
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Originally Posted by marshdrummer View Post
I don't run one on mine....It will make your pedal a little slower in response....That being said, I have the aftermarket reservoir delete and rarely use the rear brake.
I'm more worried about the rear brake getting stuck.
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post #4 of 7 Old 12-21-2018, 03:25 PM
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I think you risk having the brake stay "on" if you have no spring, and that's pretty distastrous from safety, wear, and thermal damage perspectives. I wouldn't do it.

Jim G
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post #5 of 7 Old 12-21-2018, 05:48 PM
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Originally Posted by sLing View Post
Is it necessary to have a rear brake return spring? Just installed aftermarket rearsets but it removes the stock springs. I've read people have used graves return spring but it doesn't say R3 are compatible?
Its not 100% necessary, but for the cost you should have one. The rear brake spring is more used for preventing accidental activation of the brake light, it has no significant function other than to keep the pedal from accidentally activating the switch. The pedal doesnt weigh enough to have it drag the rear brake.

If you want get yourself one of these Woodcraft Brake Spring

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post #6 of 7 Old 12-21-2018, 05:51 PM
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. . . The pedal doesnt weigh enough to have it drag the rear brake.
I don't think I believe that. The pedal has a lot of leverage (in order to make it easy for the rider to activate it), and all it has to do is cause a very light drag and that will generate friction and heat like crazy. Whyr risk it? A suitable spring is very inexpensive.

Jim G
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post #7 of 7 Old 12-21-2018, 06:16 PM
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Originally Posted by JimGnitecki View Post
I don't think I believe that. The pedal has a lot of leverage (in order to make it easy for the rider to activate it), and all it has to do is cause a very light drag and that will generate friction and heat like crazy. Whyr risk it? A suitable spring is very inexpensive.

Jim G
While I dont completely disagree, I ran mine for over a year without one... there wasnt any brake dust on the caliper so clearly it was never dragging, and I never had the brake light activate on its own, but I did change the switch to a fluid activated one, not the factory mechanical one. Although like I mentioned, for the less than $20 it is for one, its a no brainer to put one on.

I have hard time believing a 300ishgram lever would have enough force to activate the rear brake enough to cause it to drag though. The hydraulic/mechanical resistance is likely higher than what that brake lever can counteract without your foot applying any force.
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