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Wierd vibration from brake pedal with cam..

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Old 03-09-2008, 11:42 AM
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Default Wierd vibration from brake pedal with cam..

Just had my 215/220 cam installed last night. Everything seems great and it lopes pretty hard with the 112 lsa. Only thing is the vibration from my brake pedal while at a stop. Feels like the brake booster or something? Its not tuned yet for the cam and I'll be getting a stall put in shortly.
Old 03-09-2008, 12:18 PM
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put the converter in it, then tune, should be alright.
Old 03-09-2008, 12:25 PM
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Originally Posted by 03GMC
Just had my 215/220 cam installed last night. Everything seems great and it lopes pretty hard with the 112 lsa. Only thing is the vibration from my brake pedal while at a stop. Feels like the brake booster or something? Its not tuned yet for the cam and I'll be getting a stall put in shortly.
Decreased vacuum to the brake booster.
Old 03-09-2008, 12:40 PM
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So tuning can increase the vacuum to the brake booster?
Old 03-09-2008, 01:45 PM
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Originally Posted by 03GMC
So tuning can increase the vacuum to the brake booster?
negative. How much vacuum do you have a idle?
Old 03-09-2008, 01:47 PM
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Originally Posted by BlownChevy
negative. How much vacuum do you have a idle?
No idea. How do I figure that out? Has something to do with the cam. It was fine, I put a cam in it and now it does this.
Old 03-09-2008, 02:40 PM
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Have it tuned. Increase your idle speed. Get a higher stall converter.
Old 03-09-2008, 05:28 PM
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Originally Posted by sbw9056
Have it tuned. Increase your idle speed. Get a higher stall converter.
all three are things that are NOT going to change his problem.
Old 03-09-2008, 05:33 PM
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Whats the overlap on that cam? A 112lsa doesnt usualy cause this issue.
Old 03-09-2008, 05:43 PM
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Originally Posted by BlownChevy
all three are things that are NOT going to change his problem.
somewhat true. The 2003 trucks have a vacuum pump on the brake booster that should compensate. Under other circumstances the vacuum can reduce the power of the brake booster.

can we get more description of the "vibration", is it while stopping, sitting at idle, does it change with the lope/ surge of the motor?


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