thatguy2014 Posted May 1, 2014 Report Share Posted May 1, 2014 Hi I'm new to this sight I have a 1980 720. So the problem I'm having is the clutch isn't building pressure the slave wont move ant the pedal don't get any stiffer, so my question is what do you guys think I should replace first, and my second question is how hard would it be to convert it to a cable clutch or is it even possible. Quote Link to comment
ggzilla Posted May 1, 2014 Report Share Posted May 1, 2014 Cable clutch is inferior. Start with bleeding the clutch master. If it won't bleed, replace it. Quote Link to comment
thatguy2014 Posted May 1, 2014 Author Report Share Posted May 1, 2014 how pricey of a part would that be to replace cause all the local part stores i've called shy away when I say datsun Quote Link to comment
datzenmike Posted May 1, 2014 Report Share Posted May 1, 2014 Look in the clutch master.. does it have fluid in it or is it dry????? If low or empty fill it up. Now have someone pump the pedal several times and hold down. Loosen the bleeder screw on the slave and let fluid and air bubbles out. Close the bleeder. Let the pedal up. Press the pedal down and hold. Open bleeder and let air and fluid out. close bleeder. Let pedal up. Repeat until only clear fluid comes out , maybe 6 to 8 tries. Check the master often and refill, do NOT let it run out of fluid. Quote Link to comment
ggzilla Posted May 1, 2014 Report Share Posted May 1, 2014 Remanufactured master cylinder is less than $30 and most local auto parts stores can get it such as NAPA, AutoZone and O'Reilly http://m.napaonline.com/vehicle/VehicleFinder.aspx?makeID=50018&text=Datsun 1/2 price from NAPA if you order online Datsun 720 parts are readily available Parts employees that study their craft are less available Quote Link to comment
datzenmike Posted May 1, 2014 Report Share Posted May 1, 2014 If you replace everything or part, you will still have to bleed it. This can possibly be fixed for a pint of DOT3 Quote Link to comment
ggzilla Posted May 1, 2014 Report Share Posted May 1, 2014 all the local part stores i've called shy away when I say datsun Ask for parts for 1980 Nissan 720 and they will be able to find then. NAPA is one of the few that lists them under Datsun. Quote Link to comment
xsdg Posted May 1, 2014 Report Share Posted May 1, 2014 Even easier: most of those stores will let you search by vehicle on their websites. Just go to, say, PepBoys.com, enter in your truck year (note that if it's after 1983, it's a Nissan. Before 1983, it's a Datsun) and model info. Then you should be able to search for the part. Worst case, RockAuto.com is your friend. Quote Link to comment
xsdg Posted May 1, 2014 Report Share Posted May 1, 2014 Oh, and a lot of those sites will put them together. So the make will be "Nissan-Datsun" or something like that. Quote Link to comment
ggzilla Posted May 1, 2014 Report Share Posted May 1, 2014 On most web sites, and most in store databases, they are all listed under Nissan. Quote Link to comment
thatguy2014 Posted May 1, 2014 Author Report Share Posted May 1, 2014 Look in the clutch master.. does it have fluid in it or is it dry????? If low or empty fill it up. Now have someone pump the pedal several times and hold down. Loosen the bleeder screw on the slave and let fluid and air bubbles out. Close the bleeder. Let the pedal up. Press the pedal down and hold. Open bleeder and let air and fluid out. close bleeder. Let pedal up. Repeat until only clear fluid comes out , maybe 6 to 8 tries. Check the master often and refill, do NOT let it run out of fluid. I made sure it was full and I keep checking it it bubbles bout after a half hour of doing it nothing Quote Link to comment
thatguy2014 Posted May 1, 2014 Author Report Share Posted May 1, 2014 Thanks guys for the help I just ordered the slave pin and master Quote Link to comment
ggzilla Posted May 1, 2014 Report Share Posted May 1, 2014 When they arrive, bleed the master before installing. If not sometimes it won't work. Quote Link to comment
xsdg Posted May 3, 2014 Report Share Posted May 3, 2014 I made sure it was full and I keep checking it it bubbles bout after a half hour of doing it nothing This sounds like you started off bleeding the wheels. You need to bleed the proportioning valve first. I know on my truck, it's under the passenger seat, on the inside of the frame rail. I had tried to bleed just the wheels before and it didn't work out very well. The purpose of the proportioning valve is to keep the rear wheels from locking up under hard braking, and so it has the ability to prevent pressure from getting to the rear wheel cylinders. Quote Link to comment
xsdg Posted May 3, 2014 Report Share Posted May 3, 2014 I meant to mention: it's possible that it's in a different spot on the '80 trucks. I don't know. Quote Link to comment
ggzilla Posted May 3, 2014 Report Share Posted May 3, 2014 Why should he bleed the LSV? Will that help the clutch? 2 Quote Link to comment
thatguy2014 Posted May 3, 2014 Author Report Share Posted May 3, 2014 Well updating I replaced both components got up all bleed an now its working perfect my trucks up an running now just gotta find some Datsun meets on colorado 1 Quote Link to comment
ggzilla Posted May 3, 2014 Report Share Posted May 3, 2014 Glad to hear. Another Datsun on the road. By the way, they'll need replacing in another 35 years or so. Quote Link to comment
thatguy2014 Posted May 5, 2014 Author Report Share Posted May 5, 2014 Well that ain't all bad Quote Link to comment
xsdg Posted May 6, 2014 Report Share Posted May 6, 2014 ggzilla: Whoops. I was dealing with a brakes thread on another forum and got mixed up. Quote Link to comment
Justin Berni Posted August 26, 2014 Report Share Posted August 26, 2014 Can anyone tell me where the bleeder is on an '85?? Quote Link to comment
wayno Posted August 26, 2014 Report Share Posted August 26, 2014 Can anyone tell me where the bleeder is on an '85?? Bleeder for the clutch slave? It's on the slave. 1 Quote Link to comment
Justin Berni Posted August 26, 2014 Report Share Posted August 26, 2014 I looked and didn't see it, too, bottom, side?? Quote Link to comment
wayno Posted August 27, 2014 Report Share Posted August 27, 2014 It should be within a half inch above the hose coming off it. Quote Link to comment
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