Rear brake dragging.

TexasKZ
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10 Jan 2020 06:10 #816816 by TexasKZ

Replied by TexasKZ on topic Rear brake dragging.

Did you insure that the caliper shafts are perfectly clean and smooth, and that the caliper slides smoothly on the bracket and that there was a little genuine caliper grease on the sliding surfaces?

1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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Caleator
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10 Jan 2020 06:55 #816823 by Caleator

Replied by Caleator on topic Rear brake dragging.

didn't use grease, but I used brake fluid on all the moving parts.

was gonna take the caliper apart and clean around the seal.

would high temp water proof grease be a good substitute?

1981 Kawasaki GPZ550 (KZ550D-1)

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baldy110
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10 Jan 2020 08:14 #816831 by baldy110

Replied by baldy110 on topic Rear brake dragging.

No it's not use caliper grease. Piston seals are square, I've had rebuild kits that came with orings do not use those.

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Caleator
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10 Jan 2020 09:17 #816838 by Caleator

Replied by Caleator on topic Rear brake dragging.

www.acehardware.com/departments/automoti...AvD_BwE&gclsrc=aw.ds

or

www.autozone.com/brake-and-power-steerin...AvD_BwE&gclsrc=aw.ds

or

www.autozone.com/greases-and-gear-oil/lu...AvD_BwE&gclsrc=aw.ds

would something like this work? would prefer to not have to wait for grease online. I know ive seen red grease in some brake kits before.

also curious, what makeup makes it different

1981 Kawasaki GPZ550 (KZ550D-1)

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Mikaw
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10 Jan 2020 09:46 #816843 by Mikaw

Replied by Mikaw on topic Rear brake dragging.

I’ve read Red Rubber Grease is compatible with brake fluids. Not sure if it ok if your using DOT5

1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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Caleator
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10 Jan 2020 10:30 - 10 Jan 2020 10:43 #816847 by Caleator

Replied by Caleator on topic Rear brake dragging.

bike calls for DOT 3 but on DOT 4. is there absolutely no substitute for red rubber grease?

I'm fine with ordering red-rubber grease, but the description of the castrol red rubber grease says NOT to use it on metal to metal.

how do you lube just the O ring without some of it sliding in with the piston...?

1981 Kawasaki GPZ550 (KZ550D-1)

Last edit: 10 Jan 2020 10:43 by Caleator.

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Scirocco
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Never change a running system

10 Jan 2020 11:54 - 10 Jan 2020 12:04 #816854 by Scirocco

Replied by Scirocco on topic Rear brake dragging.

I use ATE caliper grease on every rebuild. It´s a glycol basis grease like the brake fluid and Made in Germany.
You can get it for 5 Euro and it´s compatible with DOT3, 4, 5.1 glycol break fluids.

ATE-Bremszylinder-Paste-Montagepaste-Bremsen-Reparatur-Bremszylinderpaste-180g.jpg

Do never use Mineral oil or grease on internal breake parts!!!

ATE-Bremszylinder-Paste-Montagepaste-Bremsen-Reparatur-Bremszylinderpaste-180g-2.jpg

My 1975 Z 1 B 900 Project

www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode

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Last edit: 10 Jan 2020 12:04 by Scirocco.

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TexasKZ
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10 Jan 2020 13:45 - 10 Jan 2020 13:47 #816863 by TexasKZ

Replied by TexasKZ on topic Rear brake dragging.

Any decent auto parts store will stock it.

For example
www.napaonline.com/en/p/SLRSL3301

1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

Last edit: 10 Jan 2020 13:47 by TexasKZ.

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TexasKZ
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10 Jan 2020 13:57 #816866 by TexasKZ

Replied by TexasKZ on topic Rear brake dragging.

Caleator wrote: bike calls for DOT 3 but on DOT 4. is there absolutely no substitute for red rubber grease?

I'm fine with ordering red-rubber grease, but the description of the castrol red rubber grease says NOT to use it on metal to metal.

how do you lube just the O ring without some of it sliding in with the piston...?

That is why you should use grease designed specifically for brake calipers. It will be formulated to be non-reactive with brake fluid and seals, and will work on the metal to metal spots.

1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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Caleator
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10 Jan 2020 14:19 - 10 Jan 2020 14:21 #816868 by Caleator

Replied by Caleator on topic Rear brake dragging.

Ordered some Castrol red rubber grease, should be here tomorrow. I'll try that german stuff if im not satisfied with the red rubber grease.

www.amazon.com/GENUINE-Corrosion-Oxidati...-34-04/dp/B01L63SXSU

www.redrubbergrease.com/tips-how-to-brak...ith-rebuild-kit.html

they seem to swear by this stuff like holy water

ill be back with results, chances are where the seal sits isn't clean enough.

Would a brass brush cut up the inside of the bore? or should i just use like a nylon brush?

1981 Kawasaki GPZ550 (KZ550D-1)

Last edit: 10 Jan 2020 14:21 by Caleator.

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Scirocco
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Never change a running system

10 Jan 2020 14:57 #816870 by Scirocco

Replied by Scirocco on topic Rear brake dragging.

You have to clean the groove where the square shape rubber seal sits. There is a lot of gung build up over the years that put some more Tension on the seal and Piston.
Your caliper Piston will not move freely and will stuck in movement that cause the drag!!!

My 1975 Z 1 B 900 Project

www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode

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