SOHC.co.uk Forums > CB350/400

Renewing brake hydraulic oil

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Bradders:
Afternoon all. I have some grungy stuff in the bottom of my brake Caliper reservoir and wanted to clean it out. I’m thinking it would be a good time to renew the brake fluid as well at the same time. I’ve looked on the internet and I think it’s within my mechanical capabilities ( famous last words). Any tips or advice would be greatly appreciated. Also it says to use DOT 3 but have not seen that around. Is DOT 4 ok to use? Regards, Chris.

Nurse Julie:
You will be OK with DOT 4 or DOT 5 but do not use DOT 5.1 unless you are doing a complete overhaul and changing all rubbers etc as 5.1 is not compatible with DOT 3, 4 or 5.

Bradders:
Thanks Julie. No just going to renew the oil.

MrDavo:
Top tip, learned the hard way.

When pumping the new fluid through the system, don't be pulling the lever all the way to the bar, things will not go well, as you are taking the seals past their normal range of travel.

You can tape a matchbox or similar to the grip to stop this happening.

Ash will be along soon to point you at the appropriate service bulletin.

mattsz:
Here's one (sorry Ash!)...

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