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Offline StealthAu

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3 Piston Rear Caliper
« on: 04 June, 2018, 11:31:41 AM »
Greetings CBF1000 gurus,
I don't own a CBF1000, rather a Honda Magna which has become a compilation of various Honda models.
I converted the rear drum brake to disc of a cbr, recently upgrading to a 3 piston caliper off a CBF1000 ABS model.
I'm looking for a little info from those in know.

Firstly, what are the torque specs of the two bleed screws and the banjo bolt?

Second, what is the bleeding proceedure?
I have only come across calipers with two bleed nipples on models with combined braking. Combined braking models have two bleed nipples as well as two banjos. Basically two circuits within one caliper.

Am I meant to bleed this from both nipples? If so, what is the sequence?

Offline alan sh

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Re: 3 Piston Rear Caliper
« Reply #1 on: 04 June, 2018, 03:13:13 PM »
The rear brake of a CBF is not combined, so there should only be one bleed nipple - and two pistons, not 3 on the MK1 CBF (and 1 piston on the MK2).

So, I am not sure what you have, but I don't think it's a CBF rear caliper.

Could it be a FRONT caliper you are using?

Alan
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Offline richardcbf

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Re: 3 Piston Rear Caliper
« Reply #2 on: 04 June, 2018, 06:30:46 PM »
*Originally Posted by StealthAu [+]
.....
Second, what is the bleeding proceedure?
I have only come across calipers with two bleed nipples on models with combined braking. Combined braking models have two bleed nipples as well as two banjos. Basically two circuits within one caliper.

Am I meant to bleed this from both nipples? If so, what is the sequence?
Have you looked in the bleeding manual?!  :007:
https://www.cbf1000.com/index.php/topic,20598.msg247195.html#msg247195

Shortcut... http://bob.ollis-brown.co.uk/manuals/cbf1000/2006-2008-CBF1000-A-16%20HYDRAULIC%20BRAKE.pdf
« Last Edit: 04 June, 2018, 06:33:54 PM by richardcbf »
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Offline StealthAu

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Re: 3 Piston Rear Caliper
« Reply #3 on: 04 June, 2018, 10:07:27 PM »

Thank you! I was looking everywhere for the service manuals, all the links I found were dead.

Offline StealthAu

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Re: 3 Piston Rear Caliper
« Reply #4 on: 04 June, 2018, 10:08:48 PM »
*Originally Posted by alan sh [+]
The rear brake of a CBF is not combined, so there should only be one bleed nipple - and two pistons, not 3 on the MK1 CBF (and 1 piston on the MK2).

So, I am not sure what you have, but I don't think it's a CBF rear caliper.

Could it be a FRONT caliper you are using?

Alan

It is a Mk1 caliper, detailed in the mk1 service manual. Seems there were several varieties with different brakes. 

Offline Whirlwind

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Re: 3 Piston Rear Caliper
« Reply #5 on: 17 August, 2018, 12:26:01 AM »
I would always bleed the one farthest away from the master cylinder first (horizontal one) then the vertical one

Offline jm2

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Re: 3 Piston Rear Caliper
« Reply #6 on: 17 August, 2018, 05:46:34 PM »
What?   :005:

One of the front's has two bleeds because they are on different systems (C-ABS).

If the OP really has managed to stick a front caliper on the rear of his magna;
a) he's done well so far,
b) most likely using two out of the three pots anyway and only one bleed nipple will actually work
c) so for the extra effort has now got a 2-pot rear

I think we need pictures ....
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Offline Whirlwind

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Re: 3 Piston Rear Caliper
« Reply #7 on: 17 August, 2018, 06:49:03 PM »
If he has used a REAR then my reply is right. One banjo bolt, 2 bleed nipples …...

Offline Biffern

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Re: 3 Piston Rear Caliper
« Reply #8 on: 18 August, 2018, 09:59:24 AM »
My rear caliper is also a 3 piston, only one banjo and 2 bleed nipples. Recently bought OEM pads and the rear set are for 3 piston  caliper. Still can't get my head round the fact it only has 1 brake line.
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Offline StealthAu

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Re: 3 Piston Rear Caliper
« Reply #9 on: 18 August, 2018, 10:48:53 AM »
I'm back, worked out how to bleed it. I'm surprised there is so much confusion regarding the brakes given this is the cbf1000 forum.

there were a few variants of this model with different brakes. There was a mk1 model with linked brakes, hade a three piston rear and two three piston fronts.

This linked brake system was vary different from the usual Honda linked brake system, as found on VFR's and CBXX's.
On the CBF, the front brake lever operated the 3 piston front left caliper and two of the pistons on the front right. No effect on the rear at all.
The rear master when applied would operate all three of the rear pistons, there is a pressure valve in the rear system, when the pedal is applied to a point, it would also operate one front left piston.

Thanks for the help from those in the know, I hope this helps clear things up for those unaware of this variant.