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nbooij

Joined:

Apr 13

Posts: 11

nbooij says:

brakes Yamaha XJ900s diversion

We overhauled front suspention and brakes (rear and front). All seals are replaced, metal hoses and new pads added. However the result is hardly noticable, other than the bike is rolling better if not braking. What we did not do is changing the brake cylinder on the steer.
Question 1: Will breaking improve if we change the cylinder for a newer model, say 2003?
Question 2: Are there any breaking cylinders which do fit and have a greater breaking capacity?

Question 3: Be happy and live with the situation?    
Thanks, Nico Booij

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  • Posted 2 years ago (15 April 2013 20:24)

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jaffa90

Joined:

Mar 09

Posts: 8820

jaffa90 says:

brakes

Welcome Nico,more info really,

did you replace the seals in the front master cyl (brake lever)?

Is the brake lever spongy (goes past halfway) or firm at half way travel?

It sounds to me you may have a twisted braided hose (metal hose) or air trapped in the system usually at the banjo connections or simply the pads are not bedded in. 

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kcmc

Joined:

Jan 08

Posts: 7178

kcmc says:

What

year is your bike?:mellow:

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nbooij

Joined:

Apr 13

Posts: 11

nbooij says:

brakes Yamaha XJ900s diversion

Thanks for your reply Jaffa,

1. Did not service the brake lever.
2. Brake lever goes beyond half way and does not feel firm.

Could give the pads some time, but that does not explain the spongy brake lever.
Will investigate the twisted braided hose and service the brake lever.
Thanks from a windy Island Terschelling (North of the Netherlands).

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nbooij

Joined:

Apr 13

Posts: 11

nbooij says:

brakes Yamaha XJ900s diversion

Hello kcmc,


The diversion is from 1995, model 4KM.

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jaffa90

Joined:

Mar 09

Posts: 8820

jaffa90 says:

spongy

now you mention spongy brake lever:blink:,

sounds like air in the system but service that master cyl as well,

not sure but kcmc may be thinking it has an anti/dive system as well,if so i`ll leave it with him.

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bikedoctor4u

Joined:

Apr 13

Posts: 48

bikedoctor4u says:

spongy

means it has not been bled correctly.. do it again.

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kcmc

Joined:

Jan 08

Posts: 7178

kcmc says:

Yamaha 900 Diversion 1995 4KM

Hi Nbooji  and welcome to the site:smile

Where do you live?:wacko:

Am not a fan of the brake master cylinder on your bike(but that's a long story)You could replace it with say a Fazer 600 but if there isn't a issue with it,you will probably find there is air still trapped at the master cylinder banjo bolt especially with it being a double banjo(as already said).Take a clean rage,put it under the 12mm banjo bolt,pump the brake lever and hold it,with your other hand and a 12mm ring spanner just loosen enough for the brake fluid to ooze  out you should see some fizzing if there's air trapped.Lock it back up and repeat until the fizzing stops and just brake fluid oozes out.Good Luck

KCMC:tongue:   

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nbooij

Joined:

Apr 13

Posts: 11

nbooij says:

brakes Yamaha XJ900s diversion

Hello KCMC,


Thanks for your advice. Bought a master brake cylinder from a FJR1300 from 2011. This was a little more expensive than an overhaul of the existing cylinder. Probably air is a part of the problem. Looking forward to the results.

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nbooij

Joined:

Apr 13

Posts: 11

nbooij says:

brakes Yamaha XJ900s diversion

Hello KCMC,


Thanks for your advice. Bought a master brake cylinder from a FJR1300 from 2011. This was a little more expensive than an overhaul of the existing cylinder. Probably air is a part of the problem. Looking forward to the results.

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nbooij

Joined:

Apr 13

Posts: 11

nbooij says:

brakes Yamaha XJ900s diversion

This weekend we tried the main brake cylinder of a 2011 FJR1300 on my XJ900s (95 KM). However it did not work. We did not succeeded in building up pressure. We noticed a few things:

1. Bolt which came with metal hoses has small holes on one side in stead of two sides! Because area is the square of the radius, this a quite an impact.
2. Bolt was longer, but we could suck the fluid with a pump from the brakes, so there should be an opening.
3. Metal hoses still are twisted a little bit.
4. Master cylinder pushed the brake fluid in the air.

After we discovered it did not work we replaced the old stuff. Brakes are not bad, but should do better. 

Next step looking for newer master cylinder which will fit. Because metals hoses are not up to our standards, we will replace them by "self made" hoses.

Keep you posted.
Nico
  

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