1990 Chevy Suburban Losing brake pressure

1990 CHEVROLET SUBURBAN
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CHRSHE
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Brakes problem
1990 Chevy Suburban V8 Four Wheel Drive Automatic

I've noticed in the past 2 or 3 days that I'm losing brake pressure when I hold the brakes, sitting at a stop light or in traffic.
I've checked the fluid level and it's fine.
I'm wondering if this would be a vaccuum leak or if my Master Cylendar is going the way of the Do-Do.
May 5, 2009 at 2:04 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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