Author Topic: Master cylinder rebuild issues  (Read 611 times)

Offline thegreatpan

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Master cylinder rebuild issues
« on: September 25, 2017, 07:38:46 PM »
Help / advice needed?

The final job of recommissioning my  my UK spec 1977 400 Four, is causing me some grief.

I have spent today installing a DS master cylinder service kit. I had the devil's own job getting  the wire clip (spring wire not circlip) to hold the rubber boot is there an easy way for this?

Regrettably, there is still a slight weep from the lid of the reservoir unless I tighten the lid to full Muller (technical term). Do I need a new rubber for the cylinder or perhaps a new lid? Lever is now firm and no other leaks.

The bike has passed the MOT and I have now ridden 100 miles with no other issues, it's a great ride!

Offline mike the bike

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Re: Master cylinder rebuild issues
« Reply #1 on: September 25, 2017, 08:22:51 PM »
Between the lid and the rubber diaphragm there should be a white plastic ring, L - section IIRC.
Those boots can be a sod to get on, I use a skinny screwdriver.
Where's that 10mm socket got to?

Offline thegreatpan

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Re: Master cylinder rebuild issues
« Reply #2 on: September 25, 2017, 08:34:22 PM »
I'll check that out, thanks.

Offline thegreatpan

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Re: Master cylinder rebuild issues
« Reply #3 on: September 26, 2017, 04:56:03 PM »
I have the white L Section washer and it looks in very good condition, and other ideas?

Offline hairygit

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Re: Master cylinder rebuild issues
« Reply #4 on: September 26, 2017, 04:59:33 PM »
What's the condition of the diaphragm, particularly where it rests on the lip of the reservoir?
If it's got tits or wheels, it's hassle, if it's got both, RUN!!!

Offline thegreatpan

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Re: Master cylinder rebuild issues
« Reply #5 on: September 27, 2017, 08:44:59 PM »
Diaphragm looks good, no further leaks today, fluid level just below the line on the reservoir, so maybe I had over filled it.

Offline mike the bike

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Re: Master cylinder rebuild issues
« Reply #6 on: September 28, 2017, 07:35:29 AM »
I was thinking that too.  There's some sort of MAX line inside the reservoir.  Can't remember off hand.
Where's that 10mm socket got to?

 

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