If you’re having intermitted brake loss under hard braking, try to bleed the ABS pump before replacing it. Because by running the ABS brake bleed procedure may help loosen up the stuck valve in the pump. That’s exactly the Autel MaxiPRO MP808 Scanner can help to do.
Instead of dumping money into a new pump(master cylinder) directly, it’s worth a try. Following is a quick demonstration on how to do.
Autel MP808 Bleed ABS Pump Procedure
This is testing on a 2009 Ford Escape XLT.
Connect MP808 to OBD.
Turn ignition on without starting engine.
Diagnostics >> Ford >> Automatic selection >> Read >> OK >> Yes
Is the vehicle fitted with a factory installed navigation system? Not equipped.
Hot functions >> Brake bleed >> ABS(Antilock braking system) service bleed
Before continuing refer to workshop manual and complete all necessary steps before starting test.
Prepare vehicle for test.
Turn ignition on.
Depress the brake pedal and HOLD.
ABS service bleed operation in progress…Just wait.
Pumped it back up now, it’s firm.
You can hear the sound during process.
By just doing the brake bleed, my problem is fixed. It’s not guarantee to fix all the time, but it’s still worth to do before replacement. Even then, you’ll also need MaxiPRO MP808 Tool to program the new pump.