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Author Topic: Front disc malfuntion  (Read 406 times)

skoleskibe

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Front disc malfuntion
« on: June 03, 2017, 02:41:16 PM »

2015 SR 14000km.
Hi there fellow Zero drivers.

any one experienced a pronounced knocking from the front brake? Therese is nothing when breaking lightly (normal driving) but when dropping the anchor (spirited driving) (deaf and blind pedestrians, strategi dogs etc.) the knocking comes after Hald a second of breaking, and gets fast progressive worse as the speed drops and the disc heats up.

Cant find any cracks in the disc, but its rather scarry.


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grandpa

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Re: Front disc malfuntion
« Reply #1 on: June 03, 2017, 02:46:05 PM »

2016 S, no knocking on my side, even when my rear wheel doesnt stick the ground anymore  :o
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Zero S 11k 2016

hubert

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Re: Front disc malfuntion
« Reply #2 on: June 03, 2017, 03:21:31 PM »

Isn't it the ABS kicking in?
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2014 Zero S
Velomobile "Quest"
Mitsubishi i-MiEV

skoleskibe

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Re: Front disc malfuntion
« Reply #3 on: June 03, 2017, 03:23:05 PM »

Nah its once a revolution of the wheel, and its knocking on the harder Breaking side


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Killroy

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Re: Front disc malfuntion
« Reply #4 on: June 03, 2017, 09:24:44 PM »

I notice some off the brake pad and disc rubbing after braking on my 2015 SR.  I'm not sure what the solution is.  I wish there was a little bit more clearance and pad pull back.  This is common on mountain bikes too.  On a ICE motorcycle, you would probably never notice this because the noise form the ICE.
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skoleskibe

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Re: Front disc malfuntion
« Reply #5 on: June 04, 2017, 11:57:44 AM »

Nah its once a revolution of the wheel, and its knocking on the harder Breaking side


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If Breaking even lightly, shortly after a hard breaking that has provoked the knocking, the knocking is still there. Leading me to believe that disc temperature is a major factor.
I Can provoke it by Breaking from as low as 60 km/h.
Any one know a method to look for "invisible" cracks in breaking discs?


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Richard230

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Re: Front disc malfuntion
« Reply #6 on: June 04, 2017, 07:39:57 PM »

I have never heard of a cracked rotor causing a knocking noise.  The only thing I can think of that would cause a knocking sound when braking is a loose caliper bolt or loose disc fasteners. Or perhaps a defective brake pad or one that was not properly installed.  Some brake pads are a little hard to install properly and require their upper edges to hook into a slot in the caliper body.  Also, they all have an noise-suppressing spring that presses down on the pad assembly.  Perhaps yours is missing, causing the brake pads to move around in the caliper?
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Richard's motorcycle collection:  2018 16.6 kWh Zero S, 2016 BMW R1200RS, 2011 Royal Enfield Bullet 500 Classic, 2009 BMW F650GS, 2005 Triumph T-100 Bonneville, 2002 Yamaha FZ1 (FZS1000N) and a 1978 Honda Kick 'N Go Senior.

Fred

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Re: Front disc malfuntion
« Reply #7 on: June 04, 2017, 08:16:26 PM »

I'm not familiar with the 2015 SR brake setup. Is it a sliding caliper with two pistons on one side? If so, sometimes this sliding mechanism can stick. You then get a creaking noise from the circular "rivets" holding the floating disc. It can happen with stuck pistons on a 4 piston caliper too, but less often.

Just checked my '16 FXS and it doesn't have a floating disc. I may be barking up the wrong tree.
« Last Edit: June 04, 2017, 10:22:09 PM by Fred »
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Killroy

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Re: Front disc malfuntion
« Reply #8 on: June 04, 2017, 10:39:41 PM »

Video?
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skoleskibe

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Re: Front disc malfuntion
« Reply #9 on: June 05, 2017, 12:31:38 AM »

See what i can do tomorrow, hard breaking with one hand on the handlebars and one on the phone is, dodgy at the least ;-)


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Fred

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Re: Front disc malfuntion
« Reply #10 on: June 05, 2017, 02:38:02 AM »

Maybe duct tape your phone somewhere rather than hold it!
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skoleskibe

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Re: Front disc malfuntion
« Reply #11 on: June 05, 2017, 05:56:01 AM »

;-) new phone equals a 6.6kw charger price wise !!


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