Author Topic: Linked Brakes - Are they working?  (Read 2302 times)

Offline basadia

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Linked Brakes - Are they working?
« on: May 21, 2016, 01:27:28 PM »
I've just done a front pad change on my ST1300 and while I had it on the center stand I thought I'd check the linked brakes. I pulled the front brake and I could still spin the rear tyre, I thought it might be that the ABS light being on might not activate the linked brakes so I took it for a little ride so the ABS could do it's check, put it on the center stand again and still no rear brake.
I'm not sure if the linked brake only works when the bike is moving, if not my system is not functioning.
Can anyone advise if I've done this correct or if so what might be wrong with my brakes. First point of call will be to check the fuses but as everything else is working not sure what else could cause this to stop working.
cheers
Keith
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Offline StinkyPete

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Re: Linked Brakes - Are they working?
« Reply #1 on: May 21, 2016, 01:47:00 PM »
I think it's a mechanical system.    When the front brakes are applied and the bike is moving, the pads gripping on the disk pivot the slave cylinder forward, activating a secondary cylinder that you can easily see, and which then operates the rear brake.
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Offline alans1100

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Re: Linked Brakes - Are they working?
« Reply #2 on: May 21, 2016, 02:12:46 PM »
I think it's a mechanical system.    When the front brakes are applied and the bike is moving, the pads gripping on the disk pivot the slave cylinder forward, activating a secondary cylinder that you can easily see, and which then operates the rear brake.


The rear brake should activate if you move the LH calliper by hand though I have never been able to do it on mine.

The only direct linkage is from the foot pedal to both front and rear. See diagram. The delay valve above the RH calliper prevents full front braking until rear braking is applied via the LH calliper, The hand brake only operates the front two outer pistons on each calliper.

I thought that diagram I gave before was a little off so I had a look at a 2003 manual. The 1300A is set up similar to the 1100A (same system) except for a bleed valve in the PCV on the 1300A so changed picture to suit.



« Last Edit: May 26, 2019, 11:49:49 PM by alans1100 »
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Offline basadia

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Re: Linked Brakes - Are they working?
« Reply #3 on: May 21, 2016, 03:08:46 PM »
OK armed with that info I'll double check that the front left caliper is moving freely. If there is any further faults it will be a deeper dig to check out the issue.
Dammed if I know how you guys can get such good economy from your ST1300's, my best to date is 16.2 km/l. I did fit a speedo healer so not sure if that has changed the calibration on my odometer.
Keith
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Offline winston66

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Re: Linked Brakes - Are they working?
« Reply #4 on: May 21, 2016, 04:18:40 PM »
I wonder that if all you need in order to get better economy  is a limp right wrist.
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Offline Biggles

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Re: Linked Brakes - Are they working?
« Reply #5 on: May 21, 2016, 05:33:22 PM »
I wonder that if all you need in order to get better economy  is a limp right wrist.

None of that in here, thank you!   :-(((


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Offline basadia

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Re: Linked Brakes - Are they working?
« Reply #6 on: May 21, 2016, 06:22:29 PM »
I think it's a mechanical system.    When the front brakes are applied and the bike is moving, the pads gripping on the disk pivot the slave cylinder forward, activating a secondary cylinder that you can easily see, and which then operates the rear brake.


The rear brake should activate if you move the LH calliper by hand though I have never been able to do it on mine.

The only direct linkage is from the foot pedal to both front and rear. See diagram. The delay valve above the RH calliper prevents full front braking until rear braking is applied via the LH calliper, The hand brake only operates the front two outer pistons on each calliper.

I thought that diagram I gave before was a little off so I had a look at a 2003 manual. The 1300A is set up similar to the 1100A (same system) except for a bleed valve in the PCV on the 1300A so changed picture to suit.






"The delay valve above the RH caliper prevents full front braking until rear braking is applied via the LH calliper"
So by your explanation that means that if the rear caliper is not activated the delay valve will stop you getting full breaking to the front as well.

"The hand brake only operates the front two outer pistons on each caliper"
So why have 3 pot pistons if it only uses the outer two pistons?
Keith
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Offline StinkyPete

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Re: Linked Brakes - Are they working?
« Reply #7 on: May 21, 2016, 08:15:58 PM »
Here's a further explanation of the braking system....    http://stwiki.notonthe.net/twiki/bin/view/ST13/LinkedBrakingSystem
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Offline alans1100

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Re: Linked Brakes - Are they working?
« Reply #8 on: May 21, 2016, 09:34:30 PM »

"The delay valve above the RH caliper prevents full front braking until rear braking is applied via the LH calliper"
So by your explanation that means that if the rear caliper is not activated the delay valve will stop you getting full breaking to the front as well.
Only if using the brake pedal alone.

Quote
"The hand brake only operates the front two outer pistons on each caliper"
So why have 3 pot pistons if it only uses the outer two pistons?


The centre pistons on the front are activated by the brake pedal.



A road test will confirm it easy.

Though we have ant-dive forks when braking the weight is still transferred to the front and the bike will dive a little.

Using the foot pedal alone will cause the front to dive a little as well. You won't notice the delay valve working.
« Last Edit: May 26, 2019, 11:48:32 PM by alans1100 »
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Offline Skip

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Re: Linked Brakes - Are they working?
« Reply #9 on: May 22, 2016, 07:13:57 PM »
I always apply pressure to both hand and foot. Been a long standing habit of mine. Hope it doesn't confuse or frustrate the linked braking thingo.
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Offline alans1100

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Re: Linked Brakes - Are they working?
« Reply #10 on: May 22, 2016, 11:22:29 PM »
I always apply pressure to both hand and foot. Been a long standing habit of mine. Hope it doesn't confuse or frustrate the linked braking thingo.
Normal for me as well but it's handy to know the braking capabilities of pedal and hand on their own and both together on the combines system
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