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12-17-2017
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#1 |
 Join Date: Jul 2016
Location: Greater St. Louis
Posts: 490
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Which brake master cyl? 12mm v. 3/8” switch?
Hi everyone. Appears I have a leak at the brake master cylinder so I’m preparing to replace it. Rock Auto lists 2 MCs for the 94 ZR-1: one with a 12mm long switch, the other with a 3/8” long switch. Is this referring to the pressure differential switch, and how do I know which one my car has?
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12-17-2017
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#2 | |
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Join Date: Oct 2004
Posts: 1,890
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Re: Which brake master cyl? 12mm v. 3/8” switch?
Quote:
What casting information is on your master cylinder? You might need a mirror to read it. |
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12-18-2017
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#3 |
 Join Date: Aug 2006
Location: McLean, VA
Posts: 3,723
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Re: Which brake master cyl? 12mm v. 3/8” switch?
I replaced my master and the reservoir in October 2016 and did not run into part number/compatibility issue you are having.
Below is the vendor I got my parts from and had no issue. Perhaps part number listed can help you with cross-referencing. https://corvetteparts.com/catalog?q=...aster+cylinder |
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12-18-2017
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#4 |
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: Which brake master cyl? 12mm v. 3/8” switch?
There are four listed for your car on RA. Only one is noted as 3/8’s. It’s aftermarket. The Ac/Delco unit is 12mm, go with that.
H 
__________________
90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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12-18-2017
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#5 |
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Join Date: Jul 2016
Location: Greater St. Louis
Posts: 490
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Re: Which brake master cyl? 12mm v. 3/8” switch?
Good advice, so it’s done. I’ll update if any problems but don’t anticipate them. Ty all.
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