To add brake fluid in a 1990 Mazda Protege, you need to locate the brake fluid reservoir and check the levels. The reservoir is located on the master cylinder for the brakes.
brake fluid
1. Clutch fluid is brake fluid. 2. The fluid used for your clutch master/slave cylinders is pulled from your brake fluid reservoir.
this is a guess but most Proteges use DOT3
it uses the "extra" fluid from the brake reservoir, so just check that you are ok on brake fluid and your clutch should be fine
DOT 3 Brake Fluid
next to the brake fluid reservior
The clutch hydraulic fluid reservoir for a Mazda 121 is located next to the brake booster and brake master cylinder. The reservoir is small and round and is close to the driver side fender.
DOT-4 is recommended
On the firewall drivers side. Clutch runs from the brake reservoir
use brake fluid
It uses brake fluid in the brake fluid reservoir. The clutch fluid (brake fluid) is fed by the brake fluid reservoir. The clutch fluid reservoir is just beneath the brake fluid reservoir. So, add fluid to the brake fluid reservoir to fill the clutch fluid, also.