KZR's Bikes of the Month for 2024

Rear master cylinder hose

  • Highway Magician
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16 Jul 2020 09:54 #830804 by Highway Magician
Rear master cylinder hose was created by Highway Magician
I had a hard time finding the correct EPDM hose at local automotive parts stores.

I did find this. US-made, by Goodyear. Way more than I need but cheap enough:

www.tractorsupply.com/tsc/product/abbott...se-1-4-in-id-x-10-ft

Motorcycle builder since 1973. Master Tech. Current bike: 1982 GPZ1100B2.

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19 Jul 2020 14:38 #831000 by VTEC
Replied by VTEC on topic Rear master cylinder hose
I used Galfer for steel braided hoses. You can give them measurements or send them your old hose to copy.

galferusa.com/products/lines

KZ1000-K2
ZRX1100
XR400R

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19 Jul 2020 15:06 #831003 by TexasKZ
Replied by TexasKZ on topic Rear master cylinder hose
I believe HM is asking about the low pressure hose between the master cylinder and the reservoir.

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

www.kzrider.com/11-projects/620336-anoth...uild-thread?start=24

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19 Jul 2020 15:17 - 19 Jul 2020 15:20 #831004 by VTEC
Replied by VTEC on topic Rear master cylinder hose

TexasKZ wrote: I believe HM is asking about the low pressure hose between the master cylinder and the reservoir.


Oh, I thought he was talking hose from master to caliper. Should be able to get low pressure hose almost anywhere like Amazon, or even an OEM hose for another bike with the same ID, and a similar curve if it has one.

KZ1000-K2
ZRX1100
XR400R
Last edit: 19 Jul 2020 15:20 by VTEC.

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19 Jul 2020 15:24 #831005 by TexasKZ
Replied by TexasKZ on topic Rear master cylinder hose
The diagram at Partzilla shows a straight hose there, so just for a lark, I decided to look at new Kawasakis to see what they look like. Evidently, straight hoses have gone out of fashion. I did see that the last few years of copcycles and the early 600 Ninjas shared a nice, straight hose hat is still available. I do not know the dimensions, but maybe somebody with one of those models will take some measurements and post them.

www.partzilla.com/product/kawasaki/43059...dde68215f1e0ae6ca01b

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

www.kzrider.com/11-projects/620336-anoth...uild-thread?start=24

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  • Highway Magician
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19 Jul 2020 15:44 #831008 by Highway Magician
Replied by Highway Magician on topic Rear master cylinder hose
Yes, I'm talking about the hose from the master cylinder reservoir to the rear master cylinder.

It should be EPDM hose, not just any low-pressure hose, as those aren't rated for brake fluid.

The hose I bought is 1/4" ID.

I make my own brake hoses with Earl's PTFE-lined, -3 Speed Flex hose and fittings.

Motorcycle builder since 1973. Master Tech. Current bike: 1982 GPZ1100B2.

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19 Jul 2020 15:59 - 19 Jul 2020 16:03 #831009 by VTEC
Replied by VTEC on topic Rear master cylinder hose

Highway Magician wrote: Yes, I'm talking about the hose from the master cylinder reservoir to the rear master cylinder.

It should be EPDM hose, not just any low-pressure hose, as those aren't rated for brake fluid.

The hose I bought is 1/4" ID.

I make my own brake hoses with Earl's PTFE-lined, -3 Speed Flex hose and fittings.


1/4" is 6.35mm., and may be a tad loose if OEM is 6mm. My guess is OEM hoses may be a standard size,and getting one for the bikes TexasKZ suggested might pay off in the long run, Can anybody confirm the OEM ID?

Done this before with fuel/vacuum hoses, and English sizes are often not the perfect fit.

KZ1000-K2
ZRX1100
XR400R
Last edit: 19 Jul 2020 16:03 by VTEC.

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19 Jul 2020 19:37 #831022 by Highway Magician
Replied by Highway Magician on topic Rear master cylinder hose
1/4" ID is correct for my '82 GPZ1100.

Motorcycle builder since 1973. Master Tech. Current bike: 1982 GPZ1100B2.

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20 Jul 2020 16:53 - 20 Jul 2020 16:57 #831079 by VTEC
Replied by VTEC on topic Rear master cylinder hose
Here's a quote from Wired George dealing with 1/4" on a metric Mikuni carb.

"If 1/4" plugs are used, put a dab of super glue on the bottoms of the caps so they don't pop off when the bike is operated or use small hose clamps."

I did the same thing on mine, and yes they popped off.

wgcarbs.com/index.php/14-sample-data-articles/86-bsconnect

I know it will work, but not the tight OEM fit. 6mm.

KZ1000-K2
ZRX1100
XR400R
Last edit: 20 Jul 2020 16:57 by VTEC.

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