ford F8 and chevy apache symilar brake problems... - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-18-2011, 12:50 PM
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ford F8 and chevy apache symilar brake problems...

hi,

i'm really at the end of my technical capabilities with this problem....

both apache and F8 have the same problem, pushing the brakepedal first time gives no brakes at al, pumping two or more times gives good brakes. on both trucks all wheel cylinders were replaced with wagner lockheed cylinders as they were, ordered by part number on the ones that were installed. on the ford i've replaced the brake servo a,d flexibels. but no results...

one thing i've noticed upon instaling the wheel cylinders, is that the new ones look a little bigger. the only thing i can imagine to be the problem is that the masterbrake cylinder does not have enough displacement so i'm not pumping enough brakefluid in the system to realy block the pads to the drums.

is there anyone who can help me out please, both truck should be ready for a great pumpertruck parade halve of january, so not only me but anyone involved in the parade will be very happy if this truck work like it should.

ps powerbleeded the trucks and on the ford there was a valve box that is cleaned and works like it should.

cheers steven

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Old 12-18-2011, 04:18 PM
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You either still have air in the system or your adjustment is way off. Did they work ok prior to changing the cylinders
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Old 12-18-2011, 06:32 PM
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assuming you have stock drum brakes, my feeling is that you need to break the shoes in with a couple of hard braking cycles and re-adjust your shoes closer to the drums.
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Old 12-19-2011, 07:25 AM
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residual pressure

If the brake shoes are adjusted out far enough The master cylinder should hold some residual pressure. , that's probably leaking back into the fluid chamber. the first pump puts pressure in the master cylinder and the next one applies the brakes.
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Old 12-19-2011, 09:11 AM
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You didn't mention replacing the master cylinder in either truck. Once you pump the pedal and have brakes, does holding pressure on the pedal cause it to slowly sink to the floor over time? If so, it's time for a new master cylinder.
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Old 12-30-2011, 03:15 PM
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problems solved

Quote:
Originally Posted by joe_padavano
You didn't mention replacing the master cylinder in either truck. Once you pump the pedal and have brakes, does holding pressure on the pedal cause it to slowly sink to the floor over time? If so, it's time for a new master cylinder.
both truck are finally ok, ford big job was proportioningvalve problem, stayed stuck at one side and all pads correctly adjusted.
apache mastebrake cylinder rebuild, brake pads adjusted, pedal adjusted as it should be

thanks for all the tips and tricks, lots of people will be thankfull.
tomorrow some bodywork on a international loadmaster, monday dodge D400 installation of new leafsprings, frontaxle, wheel pumps and redo brake lining all over. wish me luck
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