Are Brakes

[53driver]

If I remember correctly, the service manual says to test the secondary master cylinder, put the bike on its center stand, or other suitable device, spin the rear wheel and push the left, front caliper up. The rear wheel should stop. I did that. It works.

So, it seems the Secondary Master Cylinder functions like those non-electric trailer brake devices, i.e the car slows, applying rearward pressure to the cylinder and the piston activates the trailer wheel brakes.

So, no they are not hydraulically connected - score 1 for TailGunner
And no, activating the front brake lever does not directly activate the rear brake - 2 for TG.

However, when the bike is in motion, and the front brake lever is squeezed and the front calipers start to engage, the resulting upwards motion of the left front caliper, as depicted by the arrow in Swede's diagram,
Attachment 19897causes the secondary master cylinder to compress, forcing brake fluid to eventually engage the rear brake.



I think I've got this now.
Thanks to everyone for their input!

Cheers,
Steve

[Travelor]

So, it seems the Secondary Master Cylinder functions like those non-electric trailer brake devices, i.e the car slows, applying rearward pressure to the cylinder and the piston activates the trailer wheel brakes.

So, no they are not hydraulically connected - score 1 for TailGunner
And no, activating the front brake lever does not directly activate the rear brake - 2 for TG.

However, when the bike is in motion, and the front brake lever is squeezed and the front calipers start to engage, the resulting upwards motion of the left front caliper, as depicted by the arrow in Swede's diagram, causes the secondary master cylinder to compress, forcing brake fluid to eventually engage the rear brake.

I think I've got this now.
Thanks to everyone for their input!

Cheers,
Steve

Thanks for the very succinct summary.

[BIGLRY]

So, it seems the Secondary Master Cylinder functions like those non-electric trailer brake devices, i.e the car slows, applying rearward pressure to the cylinder and the piston activates the trailer wheel brakes.

So, no they are not hydraulically connected - score 1 for TailGunner
And no, activating the front brake lever does not directly activate the rear brake - 2 for TG.

However, when the bike is in motion, and the front brake lever is squeezed and the front calipers start to engage, the resulting upwards motion of the left front caliper, as depicted by the arrow in Swede's diagram,
Attachment 19897causes the secondary master cylinder to compress, forcing brake fluid to eventually engage the rear brake.



I think I've got this now.
Thanks to everyone for their input!

Cheers,
Steve

+1

[willtill]

So, it seems the Secondary Master Cylinder functions like those non-electric trailer brake devices, i.e the car slows, applying rearward pressure to the cylinder and the piston activates the trailer wheel brakes

Surge brakes

[The Swede]

Dual CBS (GL1800)
Attachment 19898

CBS (VTX 1800)
Attachment 19899

The Swede

[53driver]

+1

And my understanding has been validated!
Thanks!

[53driver]

Surge brakes

Thanks mate - Just getting to my second cup of coffee....

[edgeman55]

However, when the bike is in motion, and the front brake lever is squeezed and the front calipers start to engage, the resulting upwards motion of the left front caliper, as depicted by the arrow in Swede's diagram,
Attachment 19897causes the secondary master cylinder to compress, forcing brake fluid to eventually engage the rear brake.



I think I've got this now.
Thanks to everyone for their input!

Cheers,
Steve

Thats correct and is why Honda is replacing the secondary master cylinder because if it goes haywire and won't realease the rear brake one is shit out of luck which was proven to me last week when my rear brake locked up at 45mph in a right hand sweeper!

[Steve 0080]

Thats correct and is why Honda is replacing the secondary master cylinder because if it goes haywire and won't realease the rear brake one is shit out of luck which was proven to me last week when my rear brake locked up at 45mph in a right hand sweeper!

Dammmmm that got your attention... I believe you are the first on this forum to actually have the problem show it's ugly head...maybe some on the guys on the fence will have their bikes recall done !!!!!


As far as I know ALL Honda bikes that have the linked system have the same system !!!!! Which is also one of the reasons bleeding the brakes is a
PITA !!!

[3Chief]

I hate the linked brakes on my VTX...Not being able to feather which brake I want is problematic at times...Haven't had issues with the B yet, however I'm fairly certain when I finally get it home that the same issues will arise.