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Discussion Starter #1
Brake pedal sometimes loses pressure

I've noticed this a few times. I'll be sitting at a stop light. And the pedal loses pressure sometimes and goes further in. But then I'll let off the brake pedal and then back on and the pressure is back to normal.

My truck is not under very hard braking, just normal street driving.

Any quick diagnostic ideas?

Btw, it's a 1987 22R manual 4x4.
 

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rock crawler
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12,801 Posts
If it sinks to the floor under pressure , then comes back when you pump it a little, it probably is the MC.
Be sure to bench bleed the new MC before installing, the thoroughly bleed the entire system.
 
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