GM Storm/Spectrum 1985-1993 Repair Guide

Master Cylinder



The brake fluid reservoir is located on top of the master cylinder. The master cylinder and brake system requires brake fluid that meets DOT 3 standards. DO NOT use DOT 5 silicone fluid or any fluid that contains a mineral or paraffin base oil or system damage could occur.


See Figures 1 and 2

The reservoir is translucent, with lines indicating the proper fluid fill level. It is normal for the brake fluid level to decrease slightly as the brake pads wear, so it is necessary to check the reservoir periodically in order to maintain a proper level of brake fluid. If the reservoir requires constant filling, a serious mechanical problem may be the cause and the entire brake system must be inspected for leaks and proper operation.

If it is necessary to add fluid, first wipe away any accumulated dirt or grease from the reservoir and cap. Then remove the reservoir cap by twisting counterclockwise. Add fluid to the proper level. Avoid spilling brake fluid on any painted surface as it will harm the finish. Replace the reservoir cap.

Click image to see an enlarged view

Fig. Fig. 1: Always keep the brake fluid level near the MAX fill line

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Fig. Fig. 2: The cap must be cleaned prior to removal in order to prevent brake fluid contamination