GM Astro/Safari 1985-1996 Repair Guide

Hydraulic Clutch


The clutch master cylinder is mounted on the firewall next to the brake master cylinder.


Before opening the clutch master cylinder reservoir ALWAYS use a clean rag thoroughly clean the reservoir cover and immediate surrounding area. Failure to do this could allow contaminants to fall into the fluid when the cover is removed. These contaminants, if forced through the system by the master cylinder, could destroy seals, leaking to leaks, repairs and possibly even hydraulic clutch failures.

Use only FRESH heavy duty DOT-3 brake fluid from a SEALED container. For more information on DOT-3 fluid and for tips on safe handling, please refer to the brake master cylinder information earlier in this section. Information there includes, the tendency for DOT-3 fluid to absorb moisture and the ability of it to EAT PAINT. Proper care must be used in handling the fluid to prevent vehicle or system damage.


The hydraulic clutch reservoir should be checked at least every 6 months. As with the brake master cylinder reservoir, you normally check the fluid level through the translucent plastic body of the reservoir. Fill to the line on the reservoir.

Although the level should drop slowly with clutch wear, the need to constantly add large amounts of fluid points to the probability of a leak. If a leak is suspected the system should be thoroughly inspected to prevent a hydraulic failure which would leave you stranded.