So my clutch master cylinder on my FD has a little weep of fluid around the seal where the plastic elbow goes in. The one the top up hose fits to.. Does anyone know if you can get this out and replace the seal with the master cylinder in situe or is it a case of I need to bin the whole things and replace. Seems a shame to as the cylinder works just fine other than that.

Cheers
Lee

 

I would opt for a new one. If that is leaking, you probably have other problems that are on their way.

I do recommend getting all new clutch hydraulics if one is going out - new master, new slave, new stainless braided clutch line. When one goes, if you put pressure on all the old stuff, it will go too.

Dale

 

Thanks Dale, you make a fair point.. I have a braided steel line already. I will order a complete new unit and look into a slave cylinder as well while I am at it.

 

Whilst you've got it all apart, seperate the braking system from the clutch system. I've done this myself because i don't fancy losing my brakes from a leaking clutch hydraulic component. A stylish resevoir is less than 10quid.

Blue Master Cylinder Brake Fluid Oil Reservoir Fit Suzuki GSX 600 750 GSF Bandit | eBay

 

This won't happen - there is a divider inside the reservoir that separates clutch fluid from the brake fluid.

 

There isn't one in mine. Maybe mazda added it on later models??

 

Never heard of such cases. Is it the OEM one though?

 

It's definitley OEM and there's definitley nothing seperating the brakes from clutch, which is why i installed a seperate clutch tank. I do know that mazda installed smaller and apparently more efficient booster units on later models.

 

I will definitely check this out.. I would be surprised if there was no divider in there but certainly worth noting.

Cheers
Lee

 

There is probably a divider in there, it's REALLY hard to see with fluid in the system. It's a wall about 1/2 way up and sectioning off the last 1/3rd of the reservoir. Every one I've ever worked with has had that.

Dale

 

There IS a divider, which is about 1/2 way up on the OEM reservoir.

 

OP...I'm getting ready to replace my clutch master as well. FWIW be sure to bench-bleed it and the slave. Most everything I've read mentioned theyre tough to bleed properly in the car.

 

Yup. As Dale says, 2/3 of the way towards the rear and maybe 1/3 of the way from the top.

 

There's 2 dividers in the reservoir, front circuit, rear and clutch. This is a 92 one with a S8 cap....



I prefer re-sleeved masters and slave, they'll outlast the stock cast iron ones if you have the inevitable rotary downtime.

 

How do you bench bleed? Or do you just mean prime it with fluid to get it sealed up and working properly?

 

See if there's a Youtube video or something, it's a common procedure for any master cylinder on any car. Basically you fill the reservoir with fluid, run lines from the output ports of the master back to the reservoir, then pump the cylinder with a screwdriver. It makes a closed loop and helps get the initial air out quickly.

For the clutch master I've never bench bled it though. Brake master, yes. The clutch master can be a little work to get bled but isn't horrible.

Dale

 

Okay.. Yes.. So priming it. So you are not pumping a tonne of air through the rest of the lines to bleed it. I wonder if you can back fill it with a syringe through the outlet hole? I will try and remember to at least get some fluid though it before I fit the outlet line properly.
Cheers foe the heads up.