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Old Oct 3, 2014 | 04:02 PM
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Default No brakes

O i replaced the master cylinder and brake booster in my 86 f150 and i still have no pressure in my brakes when its running but i do when its off. Why is that? I have no idea what to do at this point
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Old Oct 3, 2014 | 10:25 PM
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Did you 'bench bleed' the MC before installation?
Did you bleed the rest of the system?
If not Google or look for YouTube videos.

Last edited by klricks; Oct 3, 2014 at 10:41 PM.
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Old Oct 4, 2014 | 08:27 PM
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Originally Posted by klricks
Did you 'bench bleed' the MC before installation?
Did you bleed the rest of the system?
If not Google or look for YouTube videos.
That ^
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Old Oct 5, 2014 | 10:07 AM
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I did all that. I went to a master mechanic on the base I'm at and told me to check the vacuum modulator valve
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