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brake booster/vavuum problem

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6642charlie

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hello everyone, i have a 1982 chev.c10. 350, automatic, with a mild hi-lift cam.my problem is the brake pedal goes to the floor at idle if you apply light but steady pressure.you can release the pedal and re-apply pressure (pump one time) and you have a full and firm pedal. i suspect i need to add a vacuum reserve tank for the booster but don`t quite know how to go about it without a lot of trial and error. thanks in advance to anyone who responds.
 
6642charlie said:
hello everyone, i have a 1982 chev.c10. 350, automatic, with a mild hi-lift cam.my problem is the brake pedal goes to the floor at idle if you apply light but steady pressure.you can release the pedal and re-apply pressure (pump one time) and you have a full and firm pedal. i suspect i need to add a vacuum reserve tank for the booster but don`t quite know how to go about it without a lot of trial and error. thanks in advance to anyone who responds.
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typicaly a lack of vac from a cam or leak will make your pedal firmer. your master is probably going bad or you have a leaking wheel cylinder.
 
As said by the first post leaking wheel cylinder or leaky lines caliper valve at the front, if all is ok. Then I would try bleeding brakes a few extra times . To make sure all the air is out.
 
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