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post #1 of 2 (permalink) Old 02-15-09, 04:28 AM Thread Starter
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brakes - occasional rockhard with back-tapping

97 F150, 4.8, 217K miles

About once a month, at most, when I apply brakes, I find them rockhard. As I press harder, I feel something tapping back. After 10-15 (anxiety filled) seconds they start working normally again. So, far has only occurred within 2 minutes of start-up, and usually the first time I hit the brakes.

It's one of those occasional problems I really would rather not ignore.

Is this likely vacum related? Suggestions?

carphead is offline  
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post #2 of 2 (permalink) Old 02-15-09, 02:25 PM
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Re: brakes - occasional rockhard with back-tapping

The hard brake peddle usually means the brake power booster is bad. The 'tapping back' sounds like your anti-lock brake system. Might try checking the vacuum source to the brake booster. I'm not a pro so I will let someone else with the knowledge chime in.
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