If the wipers miss or shudder when wiping the windshield and the windshield wipers and wiper inserts are clean, check the wiper arm pressure. If the wiper arms are not within specifications, replace the wiper arms. Refer to Windshield Wiper Arm Replacement . Complete the following steps in order to check the wiper arm pressure:

1. Position the wiper arm in the center of the windshield.
2. Attach a tension scale at the end of the wiper arm.
3. While pulling on the scale, lift the wiper arm approximately 13 mm (0.5 in) above of the windshield.
4. Measure the wiper arm pressure. Ensure that the wiper arm pressure is between 7.8-9.5 N (28-34 oz).