'12 rear brake woes

jcgss77 · July 8th, 2022, 03:13 PM

Seems like this is the Ninja that won't stop throwing some kind of tantrum. Or maybe it is the guy turning the wrench...lol

Anyways, I had the issue of the rear brake not engaging. the pedal would go "to the floor" but would in no way engage the rear caliper. So I ordered a master cylinder rebuild kit, replaced the spring, rubber spacer, piston, and dust cover. Bolted all together, DOT4 added, and during bleeding it is doing the same thing. So testing at each bolt, there is liquid bleeding from each when loosened, but no fluid bleeding out of the bleeder on the caliper itself.

THAT is when I noticed that the hole in the banjo bolt does not line up with the hole in the brake line. Both washers are on the line, and I did compress the pistons and they gave nearly no resistance to the c-clamp. Am I missing something, or does it sound like a caliper rebuild/replacement?

DannoXYZ · July 8th, 2022, 04:00 PM

Hole in banjo shouldn't matter because banjo is bowed outwards all around outside So there's gap for fluid to flow all around bolt to reach hose.

Have link to master rebuild kit?

Ceeloo Yello · July 8th, 2022, 04:14 PM

I would say it is generally a good idea to change the master and the caliper at the same time.

jcgss77 · July 8th, 2022, 05:29 PM

Quote:

Originally Posted by DannoXYZ

Hole in banjo shouldn't matter because banjo is bowed outwards all around outside So there's gap for fluid to flow all around bolt to reach hose.

Have link to master rebuild kit?

I figured it would work that way, but you never know. I ordered this one.

Quote:

Originally Posted by Ceeloo Yello

I would say it is generally a good idea to change the master and the caliper at the same time.

Thanks, it looks like I just may be doing that.

DannoXYZ · July 8th, 2022, 08:15 PM

Did you inspect bore of master-cylinder for roughness or corrosion?

Let's separate Master & Servant to isolate where problem may be.

1. disconnect banjo-bolt at master outlet
2. cap off hole with single crush-washer and short 10mm bolt.
3. step on brake-pedal

Is it firm and immovable?

July 8th, 2022, 03:13 PM	#1
jcgss77 Its not a 250,its a Ninja Name: Shaun Location: Little Rock, AR Join Date: Jun 2012 Motorcycle(s): '12 Ninja Kaw, '22 CFMOTO 300NK Posts: 275	'12 rear brake woes Seems like this is the Ninja that won't stop throwing some kind of tantrum. Or maybe it is the guy turning the wrench...lol Anyways, I had the issue of the rear brake not engaging. the pedal would go "to the floor" but would in no way engage the rear caliper. So I ordered a master cylinder rebuild kit, replaced the spring, rubber spacer, piston, and dust cover. Bolted all together, DOT4 added, and during bleeding it is doing the same thing. So testing at each bolt, there is liquid bleeding from each when loosened, but no fluid bleeding out of the bleeder on the caliper itself. THAT is when I noticed that the hole in the banjo bolt does not line up with the hole in the brake line. Both washers are on the line, and I did compress the pistons and they gave nearly no resistance to the c-clamp. Am I missing something, or does it sound like a caliper rebuild/replacement?

July 8th, 2022, 04:14 PM	#3
Ceeloo Yello ninjette.org guru Name: C Location: Hawaii Join Date: May 2011 Motorcycle(s): 250 Posts: 472	I would say it is generally a good idea to change the master and the caliper at the same time. __________________________________________________ "It ended up being the loose nut behind the wheel"

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July 8th, 2022, 04:00 PM	#2
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	Hole in banjo shouldn't matter because banjo is bowed outwards all around outside So there's gap for fluid to flow all around bolt to reach hose. Have link to master rebuild kit?

July 8th, 2022, 08:15 PM	#5
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	Did you inspect bore of master-cylinder for roughness or corrosion? Let's separate Master & Servant to isolate where problem may be. 1. disconnect banjo-bolt at master outlet 2. cap off hole with single crush-washer and short 10mm bolt. 3. step on brake-pedal Is it firm and immovable?