brakes
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Junior User
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brakes
hello i have a 1978 F100 2 wheel drive it did not have power brakes i have added a booster and master cylinder having trouble bleeding brakes anybody have thoughts ? do i have to replace the splitter on frame also ?
Lead Driver
Joined: Apr 2011
Posts: 6,399
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From: El Dorado, Arkansas
Adjusting Booster Output Rod Length
Your current disc/drum brake valve will be fine.
Some of the problem may lie in the adjustment of the output rod between the booster and the back of the MC. If this rod is adjusted too far out, it will be applying a constant amount of force on the MC and you won't be able to get the brakes fully bled, since the pistons of the MC won't be able to fully retract to their static position.
A secondary function of this is the brakes would overheat when driving, since they would be partially applied at all times, even when you weren't pressing down on the brake pedal.
There should be .005"-.010" of clearance between the tip of the booster output rod to the MC.
Procedure on how to adjust the output rod length to the MC.
http://api.viglink.com/api/click?for...JFXor3XOvX1rCA
Verification needs to be made, before going any further, to determine if this output rod is adjusted properly or if it isn't.
There's also a pin sticking out the front end of the brake valve. On an F100/F150 with a GVW of under 6,800 lbs., the shop manual says to pull and hold the pin outward on this cast iron brake valve while bleeding the brakes. --if an F250/F350 truck has a GVW of 6,800 lbs or greater, the pin on the brass brake valve is pushed inward when bleeding the brakes.
Some of the problem may lie in the adjustment of the output rod between the booster and the back of the MC. If this rod is adjusted too far out, it will be applying a constant amount of force on the MC and you won't be able to get the brakes fully bled, since the pistons of the MC won't be able to fully retract to their static position.
A secondary function of this is the brakes would overheat when driving, since they would be partially applied at all times, even when you weren't pressing down on the brake pedal.
There should be .005"-.010" of clearance between the tip of the booster output rod to the MC.
Procedure on how to adjust the output rod length to the MC.
http://api.viglink.com/api/click?for...JFXor3XOvX1rCA
Verification needs to be made, before going any further, to determine if this output rod is adjusted properly or if it isn't.
There's also a pin sticking out the front end of the brake valve. On an F100/F150 with a GVW of under 6,800 lbs., the shop manual says to pull and hold the pin outward on this cast iron brake valve while bleeding the brakes. --if an F250/F350 truck has a GVW of 6,800 lbs or greater, the pin on the brass brake valve is pushed inward when bleeding the brakes.
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