~ Anno Domini

Hope all are well -- just wondering if this NAPA clutch slave cylinder will fit on my 1989 Corvette ? Please see the photo at the link below. My main concern (other than I hope it is a good part) is whether the nipple is facing the right direction when it is installed on the car. Thank you for any wisdom & advice.

Clutch Slave Cylinder PART #NCF 73115
https://www.napacanada.com/en/p/NCF73115

Paul Workman

Nope. But, if NCRS wasn't an issue, that'd be the way to go!

The OE was a steel tube: not cast iron. And, the bleeder faced UP when the slave was installed. Yours appears to be cast iron, and when installed, the bleeder valve points to the side and not up (toward the foot-well tub.

That's all good, if NCRS points isn't a concern: otherwise it's preferable (in fact!).

Corvette Central was the source for the correct hydraulic line on my 90 (a two-piece steel sections with a rubber mid section).

But, for anyone not concerned about NCRS, that one pictured in the link is the one to use...that and the braided hydraulic line between the Master and the Slave cylinders...

bb62

Paul,

I doubt if NCRS even judges that part given its location under the car.

~ Anno Domini

Thank you Paul and bb62. I appreciate your wisdom, but can you put this in plain language so that I don't make a mistake, lol. I did a Google search and NCRS = National Corvette Restorers Society and my car is not part of the NCRS so that's not a concern. So I think what you are saying is that the link I posted to the NAPA clutch slave cylinder will fit my 1989 Corvette. So if I buy that Clutch Slave Cylinder PART #NCF 73115 from NAPA that will work on my car. Is that correct ? Thank you for baring with me and answering my question.......you are greatly appreciated.

lrj975

That NAPA part listing has a LUK logo, and it does look identical to the LUK I just installed on my 90 and fit fine, so that napa one looks good to go..

When installed, the bleeder is very close to the tunnel but just enough clearance to be able to loosen and bleed it.

haxxx

I'm currently running that napa slave cylinder in my 96. I installed it a couple years ago. While you are in there I would replace the clutch hose as well because the slave has to come off to replace that. My clutch hose actually broke less than a year after replacing the slave so I had to take it out again... yay!

~ Anno Domini

Thank you lrj975 and haxxx, your confirmation truly helps.....have a great day or night depending on when you get this !

Paul Workman

Just an "FYI", Rock Auto supplied my master and slave cylinders. But, the hydraulic hose between the master and slave had the wrong fittings - would not work with the two cylinders. I ended up sourcing the correct tube for my 90 at Corvette Central, who also had the braided line used on the 91+ model years. And, as bb62 points out, NCRS isn't likely to be inspecting that line or the slave cylinder either for that matter. So, my recommendation is to use the 91+ slave AND the 91+ braided hydraulic line for ease of installation.

hcbph

I had my slave and master replaced right after buying my 86 in 2013 and NAPA parts were used. I've had no problem with the parts. My mechanic had a bear of a time bleeding it though of the air in the system. In fact it was after talking to a former GM mechanic that gave me the tip on how to get the last of the air out of the system. Since then it's been good to go.

mickey5

Some folks on this forum feel that getting the original rebuilt is the best way to go based on numerous failures with Chinese junk. Save your original parts and offer them to other forum members.

~ Anno Domini

Appreciate all the input fellas, I went to NAPA today to pick up the parts and the parts girl told me that she made a mistake when I ordered the parts the other day and that she can only get the Luk Clutch Master Cylinder (it's being shipped to her) and not the Clutch Slave Cylinder. She said none of the NAPA stores in Canada have them. So now I am looking for another place to buy the Clutch Slave Cylinder and was wondering if this part below would fit my 1989 6-speed Corvette ? I'm a little concerned after Paul Workman mentioned the hydraulic hose between his master and slave had the wrong fittings and wouldn't work with his two cylinders. I am having a friend install them so I want to bring him the right parts. Will this 89-90 Clutch Slave Cylinder below will fit my stock car ? I called corvettecentral and they have it in stock. Note: The pice is much lower than many other places. I asked if it was brand new and they said yes. Thank you so much.

89-90 Clutch Slave Cylinder
https://www.corvettecentral.com/c4-8...ylinder-534262

Paul Workman

For clarification, it was the hydraulic line that came from Rock Auto that had the wrong size fittings for the master/slave. However, the cast iron master and (91) slave are working just fine.

~ Anno Domini

Thanks for adding the clarification Paul, that is a great relief. If anyone can confirm that the Clutch Slave Cylinder at the link below will fit my 89 6-speed that will also be a relief, lol. At this point I am assuming it will. Note to Mickey5, the Clutch Master & Slave Cylinders in the car now (that I think may be failing) were bought from someone who rebuilds the factory ones. I bought them from a person who rebuilds them in the US. He has been mentioned in this forum before, but I don't want to mention names because I want to install the new Master & Slaves to see if they make a difference and I also respect people's privacy. I will say this though, after the rebuilt Master Cylinder was installed in my car a few years ago I was told by this person that the Master would last approx. 2-3 years and the Slave a little longer based on my minimal driving habits and in hindsight I feel I should have just installed new ones like I am doing now. Anyway, hope the part below fits my car and lasts longer. Thank you.

89-90 Clutch Slave Cylinder
https://www.corvettecentral.com/c4-8...ylinder-534262

mickey5

Thanks Dan for the feedback.....good luck with the install, hope it lasts longer than the last one.

~ Anno Domini

No problem Mickey, after asking my questions in this forum, I always try and post the outcome in hopes it helps others who might be going through the same thing, but yeah I was dissapointed when I was told by the rebuilder that the rebuilt Clutch Master Cylnder I installed in my car would only last approx. 2-3 years. I thought to myself, why did I go through all the trouble of installing a factory rebuilt one if I have to change it so soon ? Anyway, I hope the new Clutch Master and Slave Cylinders make a difference......I have not had them installed yet.....time will tell. If anyone can confirm the part below will fit my 1989 6-speed it would be greatly appreciated. It looks like it will, but I am no expert. Thank you.

89-90 Clutch Slave Cylinder
https://www.corvettecentral.com/c4-8...ylinder-534262

mickey5

Did you happen to ask the rebuilder why it would only last 2-3 years? I would think its because of the materials used or the bore is diminished...what else is there?

~ Anno Domini

To answer your question Mickey5, no I don't know why the rebuilder said the clutch master cylinder would only last 2-3 years, but when I asked him how long it would last and he said the master would last 2-3 years and the slave a little longer I was very dissapointed to hear that because I went to him thinking that I was going back to the original parts and they would last a long time. I certainly did not want to have to go through the trouble of replacing both parts again 2-3 years later, but here I am doing just that. With that said, I still have to install the new aftermarket master and slave to see if it improves my shifting/clutch pedal issue. If anyone has installed the part below or can confirm that it will fit my 1989 6-speed that would be greatly appreciated. It looks like the right part, but looking for confirmation. Thank you.

89-90 Clutch Slave Cylinder
https://www.corvettecentral.com/c4-8...ylinder-534262

Paul Workman

I'm told that the steel tube type slaves are prone to early failure, and are not worth rebuilding, and to get the cast iron master/slave instead.

Who knows where or who Corvette Central gets its master and slaves from. But, when my slave died at about 65k, Marc Haibeck (the ZR-1 Specialist) recommended the cast iron parts (master and slave) from Rock Auto, as he has customers which at the time had been driving for over 5 years w/o further clutch hydraulic issues.

I'm in my 3rd driving season now with the RA parts and so far, so good. But, I couldn't say whether RA and CC had the same source or not. But, word is BOTH seem to be better than installing (especially) the steel tube (slave) cylinders.

But, as I said too, I had to reference Corvette Central to get the correct hydraulic line.

~ Anno Domini

I always appreciate the input and advice, Paul. Thank you.

bb62

For what it's worth, even the hydraulic line is not the same as the OEM part. The OEM part (at least for my 95 ZR-1 where I replaced the MC and the slave earlier this year) is only flexible about 50% of its length. The replacement is mostly flex tubing.