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Old 09-06-2010, 07:25 PM
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If the pedal is dropping then the master cylinder is worn and bypassing pressure. however that would be most noticeable while waiting at a light for instance while just holding the brake with light pressure. If they are power brakes it is possible the booster is dropping vacuum from an internal leak and at 1500 rpm there is not enough vacuum produced to keep it assisting the drivers foot pressure. In other words the booster assist is going away and the required pressure from the driver is greater making it tough to hold the brakes. Maybe the check valve is no good or not holding. I could be in left field with all of this.It is just what came to mind.If the pedal is actually dropping it would be more likely to drop with light or medium pressure than with maximum pressure. Just my thoughts
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