Master cylinder bleeding instructions

Tiny
BEANZY98
  • MEMBER
  • 1991 FORD AEROSTAR
  • 4.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 77,000 MILES
Just replaced my master cylinder with a new F19Z-2140-B. The master cylinder has a bleed fitting on it. I cannot find any information regarding the bleeding procedure. Does it have to bench bled or can it be bled on the vehicle via the bleed fitting? Any information would be a huge help.
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Monday, June 18th, 2018 AT 5:41 PM

3 Replies

Tiny
STEVE W.
  • MECHANIC
  • 12,976 POSTS
You bench bleed it (on or off car). Then bleed the rear brakes then the fronts. The bleeder will not bleed both sections of the system, it is used to bleed the front pressure switch port that is located higher than the lines.
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Tuesday, June 19th, 2018 AT 3:44 PM
Tiny
BEANZY98
  • MEMBER
  • 2 POSTS
Thanks for your response. Have bench bled master cylinders before but this one had the bleed fitting so I was really unsure. Plus there are three lines because of the RABS. So, one more question please. Would I still have to bench bleed it if I were to vacuum bleed the system?
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Tuesday, June 19th, 2018 AT 4:57 PM
Tiny
STEVE W.
  • MECHANIC
  • 12,976 POSTS
I would simply because of that top port, they like to hold an air bubble. I would also try gravity bleeding it first. Usually does the trick on those because you do not need to mess with the RABS system.
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Tuesday, June 19th, 2018 AT 6:55 PM

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