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Why is the pedal rock hard. I think it might be the booster.
Tasks
What I need to do:
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Check the vacuum line and check valve from the engine to the booster. All checked out but the vacuum hose was a little cracked. I went ahead and replaced the check valve and vacuum hose for good measure ($30).
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Still hard brake pedal. Removed the brake booster and sent it off to Irlend Engineering for rebuilding.
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Got brake booster back after about a month. Put back on and bled the brakes. Now the brakes work as they should. Rebuild was ($336 including shipping).