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Ordinarily, you do not adjust the pushrod length - it's factory-set. The first thing most folks do when they discover it's adjustable is to make it too long (which makes the brakes SEEM better) ...problem is that doesn't allow the compensating ports in the master cylinder to be uncovered when the pedal's up, so as the fluid heats under use it can't escape to the reservoir and the brakes start to lock up after a few minutes' driving.

First, ensure that the pedal stop on the floorboard is set to allow the pedal to come back ~200mm (about 8") from the firewall. If the pedal's set too low there won't be sufficient travel to allow a single brake circuit to function in the event of failure of the other. Check for freeplay at the pedal - it should be ~6mm (about ¼") which equates to about 1mm freeplay at the pushrod. A little less is acceptable, provided there is SOME perceptible freepla at the pushrod.

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Q: How do you adjust master cylinder push rod 1974 vw beetle?
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