Swap test [under menu item 'Drive links' in the 9718 PIWIS Tester]
NOTE:
The swap test must be carried out after the hydraulic unit has been replaced.
Two persons are necessary for this test. All 4 wheels of the vehicle must be free-turning (lift on a platform lift). The swap test is used to check the allocation of the brake pressure lines to the wheel brake cylinders. A hydraulic and an electrical test are carried out.