Yale G807 Brake System Air Bleed Guide
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To bleed air from the brake system:
1 Remove the floor plates and check that the master cylinder reservoir is full of oil.
2 One technician must sit in the seat and repeatedly press and release (pump) the brake pedal to increase the back pressure. The brake pedal may become harder to press as this occurs.
3 When back pressure seems to be at the maximum, the technician must press and hold the pedal as far as it will go.
4 The second technician must slowly loosen the bleed valve on one of the transaxle housings between the wheel and the frame. Air and oil should bubble from the valve until the pedal is pressed to its mechanical travel limit.
5 The pedal should be held in this position while the valve is retightened.
6 Repeat Step 2 through Step 5 until oil with no air (bubbles) flows from the valve. Check the oil level in the master cylinder every cycle and fill reservoir as necessary.
7 Perform Step 2 through Step 5 on the other transaxle until all air has been bled from the system.
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