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Old 07-19-2007, 09:36 PM   #1
chadfowler
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brake problem

i have a 72 chevy truck with power brakes and sometimes the pedal goes to the floor and then i can pump it once and it has a good pedal and then it will work good but every once in a while about every 8-10 pumps it will go to the floor again does anyone know why this is happening i think it is the master cylinder but wanted to see what yall thought befor i bought one
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Old 07-19-2007, 09:38 PM   #2
st1x10
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Re: brake problem

I would guess the master cylinder
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Old 07-19-2007, 09:54 PM   #3
69RAT
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Re: brake problem

also check the booster, if its not getting enough vacuum it'll act that way.
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Old 07-19-2007, 10:22 PM   #4
68gmsee
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Re: brake problem

I've had that happen on my 69 Chevy and my Tahoe. On mine, both times it was the master cylinder.
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Old 07-20-2007, 12:04 AM   #5
Longhorn Man
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Re: brake problem

if the booster isn't gettin enough vac.. it'll use the reserve vac in that huge booster... and if that runs out, it'll get hard.
Master for 99% sure.
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