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Brake pedal sinks in randomly

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Old 06-08-2014, 06:25 AM
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Year: 1997
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Default Brake pedal sinks in randomly

Two weeks ago, the brake pedal started sinking all the way in once I pushed it but once I let it go and push it again it would start working back normally(hard and firm) it'll work fine for about 3-5 minutes then it sinks again.then it repeats. It'll start working normally. I replaced front calipers and brakes two days ago but it still does the same thing. What can it be? Rear brakes? Brake booster? It's a 1997 xj 4x4 with 172k. Thanks!
Old 06-08-2014, 08:00 AM
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Most likely your brake master cylinder is bypassing.

Have you adjusted your rear brake shoes?
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Old 06-08-2014, 08:38 AM
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^^
What he said.
If you don't have air in the system, it's the master cylinder.
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