GM Firebird 1967-1981 Repair Guide

Brake Master Cylinder

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FLUID RECOMMENDATIONS & LEVEL CHECK



See Figures 1, 2, 3 and 4

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Fig. Fig. 1: The brake fluid level should be maintained to within 1/4 in. from the top edge of the reservoir



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Fig. Fig. 2: To check the brake fluid level, pry the retaining wire off of the master cylinder lid ...



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Fig. Fig. 3: ... and lift the lid off of the housing



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Fig. Fig. 4: Add DOT 3 or better fluid if the level is not within 1/4 in. of the top edge of the reservoir

The brake master cylinder is located under the hood, in the left rear section of the engine compartment. It is divided into two sections (reservoirs) and the fluid should be kept within 1 / 4 in. of the top edge of both reservoirs. The level should be checked at least every 6,000 miles (7,500 miles for 1975 and later models).

Any sudden decrease in the level of fluid indicates a possible leak in the system and should be checked out immediately.

To check the fluid level, simply pry off the retaining wire and lift off the top cover of the master cylinder. (Some newer models may not use a retaining bail. If not, simply lift off the top cover). When making additions of brake fluid, use only fresh, uncontaminated brake fluid which meets or exceeds DOT 3 standards. Be careful not to spill any brake fluid on painted surfaces, as it eats paint. Do not allow the brake fluid container or the master cylinder reservoir to remain open any longer than necessary; brake fluid absorbs moisture from the air, reducing its effectiveness and causing corrosion in the lines.

 
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