dave123456789 Posted October 4, 2014 Share Posted October 4, 2014 I have to top up clutch fluid as it keeps firing it out of the top of the reservoir. With the cap off it can get some distance. Does it need an overhaul or is sucking air in somewhere? I have bleed it heaps, clutch feels all good. Quote Link to comment Share on other sites More sharing options...
77magnum13hundy Posted October 4, 2014 Share Posted October 4, 2014 just replace the whole unit master cylinder, depending on what car its for and availability... if not then sort the seals out, flush the whole system (brakleen) and put new fluid in at least. also having that fluid going everywhere its a paint stripper so once its sorted make sure you deal to the places its stripped, if its not the master cylinder then check the hose, down to the slave. You'll have new stuff sorted for under a hundy buck. Quote Link to comment Share on other sites More sharing options...
dave123456789 Posted October 4, 2014 Author Share Posted October 4, 2014 Pretty hard to replace will probably have to send it away to be rekitted. It's for the prince b200. Fluid is nice and clean and it's been bleed as well as it can be bled. Can see from master to slave and all hard and soft lines look good Could it be something to do with the clutch I installed? Don't think it ever used to do this but last time clutch pedal was used was over a year ago Quote Link to comment Share on other sites More sharing options...
77magnum13hundy Posted October 4, 2014 Share Posted October 4, 2014 oh yup true, give old sterling a bell, located in onehunga... http://www.sterlingbrake.co.nz/ also depends on what its doing and when, ie does it piss out when pushing pedal in or when releasing the pedal? Quote Link to comment Share on other sites More sharing options...
Gomaxgo Posted October 4, 2014 Share Posted October 4, 2014 old gm stuff does the same things with the brake masters. The first time it happened to me i was pumping the pedal to bleed the system and didnt have the cap on, though it was fucked but turns out theyre ment to. Is it possible yours is the same? does the cap have/used to have a rubber seal on it to stop it leaking? or just a regular cap? 1 Quote Link to comment Share on other sites More sharing options...
dave123456789 Posted October 4, 2014 Author Share Posted October 4, 2014 old gm stuff does the same things with the brake masters. The first time it happened to me i was pumping the pedal to bleed the system and didnt have the cap on, though it was fucked but turns out theyre ment to. Is it possible yours is the same? does the cap have/used to have a rubber seal on it to stop it leaking? or just a regular cap? It's just a brass looking cap with a breather hole in the top. There is some rubber buffer thing under it but they look pretty haggard but have always been this shitty. I have no idea if is suppose to it not. Quote Link to comment Share on other sites More sharing options...
KKtrips Posted October 4, 2014 Share Posted October 4, 2014 With the cap on does it spray out? If it doesn't then don't worry, sometimes master cylinders will do that. 2 Quote Link to comment Share on other sites More sharing options...
dave123456789 Posted October 4, 2014 Author Share Posted October 4, 2014 With the cap on does it spray out? If it doesn't then don't worry, sometimes master cylinders will do that. It's doesn't squirt but the top of the cap gets wet and fluid does need to be topped up. Car isn't on the road so it's just garage testing. Ill swap the brake master cap with clutch and see if it makes a difference because they are identical but brake cap is in better nick. This will probably sound a bit rough but if I chucked some glad wrap under the cap and poked a couple of holes in the outside edges so it could still breathe be all good? Quote Link to comment Share on other sites More sharing options...
Gomaxgo Posted October 4, 2014 Share Posted October 4, 2014 the glad wrap will probably get eaten Quote Link to comment Share on other sites More sharing options...
Frosty Posted October 7, 2014 Share Posted October 7, 2014 Check the master for a leak from inside the cabin where the shaft goes through the firewall. I fell pretty sure you will find fluid running down the inside of the firewall. If it's only just started you may not see any but there's a rubber boot on the inside end of master cylinder, Pull it of and check for fluid. Good luck. Quote Link to comment Share on other sites More sharing options...
Hemi Posted October 7, 2014 Share Posted October 7, 2014 Umm if its the clutch master doing this then its the fluid returning from the slave back up to the master. i dunno the size of the clutch master but when bleeding brakes the return fluid can break the surface. id suggest checking the cap itself tbh, is there fluid covering the return? how much? just weird it has enough force to spray everywhere. *edit* just read your reply to KK's post .yeah that cap is knackered by the sounds. if there is anything we know about anything its if there any way at all it can get out , it will. Quote Link to comment Share on other sites More sharing options...
dave123456789 Posted October 8, 2014 Author Share Posted October 8, 2014 Where can you get classic looking master cylinder caps? I don't want no plastic crap on it. Quote Link to comment Share on other sites More sharing options...
KKtrips Posted October 8, 2014 Share Posted October 8, 2014 Giz a picture of your one and we can suggest - but if your problem is sealing then you don't want a fuck up by putting on a badly fitting metal cap just because you can't handle plastic. Remember brake fluid is hydroscopic so a badly fitting cap will just give you a world of hurt. (a bad brake pedal and rusty master/slave cylinder sleeves is just the beginning) If fluid is getting out - then sure as hell then moisture is getting back in. (In my mind you could probably fit a plastic cap and machine up a nice fitting metal cover - if you were so inclined) 1 Quote Link to comment Share on other sites More sharing options...
bogangeof Posted October 8, 2014 Share Posted October 8, 2014 This^ Quote Link to comment Share on other sites More sharing options...
dave123456789 Posted October 8, 2014 Author Share Posted October 8, 2014 How it sits currently is you just push it on and it fits in there snuggly, then theres a bit of rubber handing from the bottom and a hole in the middle of the cap. Its definitely not air tight with that hole there.Ill take a photo tonight. Quote Link to comment Share on other sites More sharing options...
KKtrips Posted October 8, 2014 Share Posted October 8, 2014 The hole in the middle of the cap is so the fluid can expand and retract - it is 99.9999% sealed by the rubber diaphragm under the cap. (well it's meant to be) Quote Link to comment Share on other sites More sharing options...
dave123456789 Posted October 8, 2014 Author Share Posted October 8, 2014 This style of cap. Quote Link to comment Share on other sites More sharing options...
dave123456789 Posted October 12, 2014 Author Share Posted October 12, 2014 Quote Link to comment Share on other sites More sharing options...
dave123456789 Posted October 14, 2014 Author Share Posted October 14, 2014 Alright guys I have Sterling Clutch and Brake repairing all my goods but even they said they don't have a cap to match which makes this all rather annoying as I cant put that rusty piece of shit back on it and just fuck all my shit up again. I don't even know where to start to find a cap? The reservoir is 30mm in diameter. Quote Link to comment Share on other sites More sharing options...
KKtrips Posted October 14, 2014 Share Posted October 14, 2014 Looks like a fairly typical Datsun cap. I would match one off a more common car (like Datsun Sunny, 1200 etc) and then go order one from Nissan. Alternatively, it sounds weird, but I would try some forklift places that service Nissan forklifts. They have all kinds of weird bits like this in stock. Quote Link to comment Share on other sites More sharing options...
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