GM had a strange factory procedure to install the slave cylinder on '90 ZR-1's. Because the bleeder valve was positioned very close to the floor they used an aluminum bleeder valve and then purposely broke it off to make it shorter, thus clearing the floor. They discontinued the supply of the replacement bleeders when they specified the '91 - '96 (PN 12509313) slave cylinder as a replacement for the 90's. The bleeder is on the bottom of new part. It's harder to bleed but it doesn't have the floor clearance problem.


The '91 bleeding procedure is to let it hang by the hose and turn it upside down. Gravity bleeding usually works okay.

Note that when you go to re-install the slave, about two oz. of fluid will backup into the master cylinder. It's advised to lower the level in the master before installing the slave cylinder on the bell housing. This will avoid a fluid spill.

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