1955 chevy with a 75 GMC IFS disc brake help - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-08-2009, 09:51 AM
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1955 chevy with a 75 GMC IFS disc brake help

i got a 55 chevy panel van that i just did a IFS swap on...
the IFS came out of a 75 GMC 3/4 ton pick up.

i utilized the master and proportioning valve off of the 75 pick up as well...

i mounted the master cylinder underneath the floor board, but not lower than the brake cylinders/calipers.

when i finished it, the front brakes would hold some pressure after i let off the brake pedal.

i went throu everything and found that the brake pedal rod was not letting the master cylinder return to its original position.

i fixed that and it seemed fine.. brakes felt perfect, and when i let off the brakes, the calipers would let off as well..... this was yesterday about 5 pm

this morning, i got up to take my kid to school. and as soon as i hit the brake pedal, and released it, the brakes would slightly grab...

i thought it could be the master cylinder boiling over, but the temp gauge hadnt even registered... ( i didnt warm the truck up)

i know that residiual valves are for instances where the master cylinder is mounted lower than the brake cylinders/calipers.... i dont think i need them, for they dont let pressure bleed back into the master..

and ive never heard of a porportioning valves going bad.....

could it be calipers?

its only happening in the front....


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Old 01-08-2009, 03:33 PM
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Are you using the 55 or 75 master cylinder?

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Old 01-08-2009, 03:58 PM
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im not that dumb man!!!

well 50% i guess...
on the 55 master, its also the mount for the brake pedal.
so took the piston out, and made it hallow to house the new brake pedal rod.
i have a new 1975 chevy master cylinder mounted behind that.

without the power booster.

i talked to my parts guy, and he said it might have a checkvalve in the front resivor that shouldnt be there.
ill have to check on that after work.

thanks for the post tho!
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