dangerboy Posted June 22, 2010 Share Posted June 22, 2010 so i pulled the master cylinder off my 260z today due to the massive amount of gunk visable when the caps were opened. i disconnected the hard line at the caliper the other day and clean fluid came out so i think the build up is isolated to the cylinder. anyway, my question is what would be the best way to clean the gunk out of the master cylinder. i scraped out what i could with a flathead screwdriver and sprayed the rest in carb cleaner. i only ask because if a good cleaning is all this needs id much rather do that than purchase another one. thanks in advance. Quote Link to comment Share on other sites More sharing options...
MONGO510 Posted June 22, 2010 Share Posted June 22, 2010 Brake rubber parts and carb cleaner are not compatable!! Rubber will swell causing failure!!! I think you should start looking for a new master or a kit to rebuild. Sorry for bad news. Mongo Quote Link to comment Share on other sites More sharing options...
doublez Posted June 22, 2010 Share Posted June 22, 2010 You should buy a rebuild kit if the cylinder it self is good. A kit will come with all new seals. Rockauto.com has one. I did this a few weeks ago. What I did was use a long narrow screw driver with a scotch brite in my parts washer. It came out pretty good, except the very back wall was tough to clean. I think you could also buy a hone and use that. Quote Link to comment Share on other sites More sharing options...
Nigel Posted June 22, 2010 Share Posted June 22, 2010 You should buy a rebuild kit if the cylinder it self is good. A kit will come with all new seals. Rockauto.com has one. I did this a few weeks ago. What I did was use a long narrow screw driver with a scotch brite in my parts washer. It came out pretty good, except the very back wall was tough to clean. I think you could also buy a hone and use that. Honing an aluminum master cylinder is not a good idea. It will remove the protective coating from the inside of the bore and result in rapid seal wear. If the bore is in bad shape then the master cylinder should be replaced. Nigel '73 240ZT Quote Link to comment Share on other sites More sharing options...
doublez Posted June 22, 2010 Share Posted June 22, 2010 Honing an aluminum master cylinder is not a good idea. It will remove the protective coating from the inside of the bore and result in rapid seal wear. If the bore is in bad shape then the master cylinder should be replaced. Nigel '73 240ZT I didn't know you couldn't hone an aluminum master cylinder. Good thing I didn't do that I guess! Quote Link to comment Share on other sites More sharing options...
zguitar71 Posted June 23, 2010 Share Posted June 23, 2010 I used compressed air through all the holes until nothing blew out then forced water through it and compressed air again and kept doing that until it was clean then let it dry for a couple of days. Then I used 0000 steel wool in the cylinder, it did not leave any scratches on the surface, probably did not need to use it but I did. The cylinder did not have any pits or groves in it, if it had I would have gotten a new one. So far so good, 4 months in and no leaking and it holds pressure. Quote Link to comment Share on other sites More sharing options...
dangerboy Posted June 23, 2010 Author Share Posted June 23, 2010 i will pull the one off the 240 and try to clean it with air and water. would it be a bad idea to use any kind of detergent with the water like Dawn or something else? Quote Link to comment Share on other sites More sharing options...
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