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View Full Version : Correct Part - Brake Master Cylinder

Atari_Prime
08-30-2021, 01:51 AM
Can anyone confirm if this is the correct part number for a 94' ZR-1 brake master cylinder?

AC Delco # 18M391429

Assuming this is the correct one, any other parts that work pretty well? Any reason to use a different part?
Jagdpanzer
08-30-2021, 09:04 AM
Yes, the AC Delco 18M391429 will work. Might consider replacing the safety switch while your at it.


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Atari_Prime
08-30-2021, 04:40 PM
Yes, the AC Delco 18M391429 will work. Might consider replacing the safety switch while your at it.


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Is the safety switch GM Part # 10074131?


Do you know if I need to be concerned with the correct port size on a 94', 3/8 v. 12 mm?
HAWAIIZR-1
08-31-2021, 12:31 PM
Is the safety switch GM Part # 10074131?


Do you know if I need to be concerned with the correct port size on a 94', 3/8 v. 12 mm?



This info from Eckler?s might help you.

https://www.ecklerscorvette.com/1992-1996-corvette-brake-master-cylinder-25-111249-1.html



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Atari_Prime
08-31-2021, 01:09 PM
This info from Eckler?s might help you.

https://www.ecklerscorvette.com/1992-1996-corvette-brake-master-cylinder-25-111249-1.html



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Wow, the info on that page was very helpful actually. Now if only Eckler's price was a bit more competitive. Their master cylinder is more than double what other sources are asking.
HAWAIIZR-1
08-31-2021, 01:13 PM
Wow, the info on that page was very helpful actually. Now if only Eckler's price was a bit more competitive. Their master cylinder is more than double what other sources are asking.


I would not buy from them either. The AC Delco unit or one of the other name brands from Rockauto might be the best prices you will find. I had no idea 95-96 had a different thread switch so good you asked so I?ll know what to look for when I have to replace my 95 unit.



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secondchance
08-31-2021, 06:22 PM
I replaced my 94 master cylinder from Davis.
https://corvetteparts.com/search?q=Brake+master+cylinder
Atari_Prime
09-13-2021, 02:31 PM
I received my new master cylinder, the model from Ecklers above but purchased from another source for less thank half the price. I compared it to the existing one on the car and everything is a perfect match except for the reservoir. There is a hose attached to the side of the reservoir on the existing master cylinder, however the new reservoir has a solid circle where the hole should be. I know I can use the old reservoir if needed, but I would prefer to use the new one. Am I missing something here?
Atari_Prime
09-13-2021, 04:19 PM
Attached are a couple of pics that someone else posted that represents my issue.


What I received looks like the cleaner one.



As best I can tell from other posts on the CF, the reservoir is an issue. Other than using my existing reservoir, what are the options?
secondchance
09-15-2021, 09:37 PM
Attached are a couple of pics that someone else posted that represents my issue.


What I received looks like the cleaner one.



As best I can tell from other posts on the CF, the reservoir is an issue. Other than using my existing reservoir, what are the options?

On 94, ABS pump is primed by diverting from the reservoir. 95 GM revised priming of ABS from another location.
Version you bought most likely is for 95. Can you switch the reservoir?
Notice below part says 92-95 and has the nipple? Pictured part will not work on a 95. Model year differentiation is getting worse as time goes by.

https://corvetteparts.com/item/brake-master-cylinder-with-correct-plastic-fluid-reservoir-with-zr1-option-1992-1995