GM Cutlass RWD 1970-1987 Repair Guide

Brake Master Cylinder

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FLUID RECOMMENDATION & LEVEL CHECK



See Figures 1, 2, 3 and 4

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 must be kept within 1 / 4 in. of the top edge of both reservoirs. The level should be checked at least every 7500 miles, (12,000 km).



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Fig. Fig. 1: The fluid level in the master cylinder reservoir should be within 1/4 in. (6.3mm) of the top edge

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 bar and then lift off the top cover of the master cylinder. When making additions of brake fluid, use only fresh, uncontaminated brake fluid which meets or exceeds DOT 3 standards.

The reservoir cover on some later models (1978 and later) may be without a retaining bail. If so, simply pry the cover off with your fingers.

Some late model vehicles use a plastic, translucent reservoir. The fluid level can be seen without removing the cap. To check the fluid level, simply observe the level in the reservoir it should never be below the MIN mark and not exceed the MAX mark.


WARNING
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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Fig. Fig. 2: On non-translucent type reservoirs, pry off retaining bar and remove master cylinder cover to observe fluid level



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Fig. Fig. 3: Pry the retaining ball from the master cylinder reservoir cap to check the fluid level



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Fig. Fig. 4: Add the brake fluid to the proper level

 
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