clutch cylinders help please!

Need technical Q/A then you're in the right place

Moderator: martauto

User avatar
orangecurry
E30 Zone Addict
E30 Zone Addict
Posts: 2514
Joined: Mon Apr 11, 2005 11:00 pm
Location: West Sussex

Post Wed Mar 29, 2017 6:31 pm

I've done a search but failed to find anything recent.

1989 325i

My clutch fluid has gone and left no note - my only excuse is that an internal coating of gunge made me think fluid was at the correct level.

I would imagine I should either

a) dismantle, clean and reseal

OR

b) replace master and slave - where/what are the best quality items please? Manufacturer? And which ones to avoid?

New or reseal - what is the advice please?

Thanks
User avatar
Brianmoooore
E30 Zone Team Member
E30 Zone Team Member
Posts: 49359
Joined: Mon Jan 10, 2005 11:00 pm

Post Wed Mar 29, 2017 7:11 pm

The basic problem is that RH drive E30s use a separate reservoir for the clutch fluid, unlike LH drive cars where it shares with the brake fluid, and so the fluid has probably been there since the car was made, rather than regularly getting changed with the brake fluid.
The fluid will have absorbed water over the years, so the chances are that the cylinder bores are corroded, as well as the seals having dissolved - the layer of gunge you referred to.
Two new cylinders is my recommendation.
User avatar
Scotty200
E30 Zone Newbie
E30 Zone Newbie
Posts: 123
Joined: Tue Oct 20, 2015 11:00 pm

Post Wed Mar 29, 2017 7:14 pm

I would replace both master and slave cylinder together as recommended on the wiki, I myself used febi for both cylinders, they are German made I believe and not stupid expensive, they can be easily found on ebay
User avatar
orangecurry
E30 Zone Addict
E30 Zone Addict
Posts: 2514
Joined: Mon Apr 11, 2005 11:00 pm
Location: West Sussex

Post Wed Mar 29, 2017 8:50 pm

Thanks both - I've used Febi parts before so am happy with their quality.
User avatar
Contours
E30 Zone Newbie
E30 Zone Newbie
Posts: 245
Joined: Thu Jan 26, 2012 11:00 pm
Location: Ireland-West

Post Wed Mar 29, 2017 10:29 pm

I installed a Topran master cylinder recently and it lasted for 500 miles. Pedal return was slow so seemingly the seals had swollen making it worse than the original master cylinder I had taken out.
User avatar
orangecurry
E30 Zone Addict
E30 Zone Addict
Posts: 2514
Joined: Mon Apr 11, 2005 11:00 pm
Location: West Sussex

Post Thu Mar 30, 2017 12:17 am

top info on cheap parts - thanks for posting