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Intermittent loss of brake pedal,only happned three times but customer says it went to the floor

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If this is a hydraulic brake system, the first thing to do is to check the brake fluid level in the reservoir. Assuming that it is not down, the problem will probably be in the master cylinder. Try pushing the brake pedal down very slowly. This will not put a lot of pressure on the seals in the master cylinder, and if there is a problem, the brake fluid will leak past the seal allowing the pedal to go slowly to the floor. If you push the brake pedal down rapidly, the pressire on the seal will hold it against the master cylinder wall, and the brakes will hold fine.
If the fluid level in the reservoir is low, look at all of the wheels and slave cylinders to see if you can locate a leak. I don't suspect a leak based on your description of the problem, but it's worth checking.

Posted on Apr 04, 2015


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