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My 1971 240 has been rebuilt from the ground up over the last 6 years and ever since i put it back together it has had poor brake pedal feel. The problem seems to be with the brake booster as the pedal goes down the first 1/3rd very easy (but without much braking force to the wheels)and at 2/3rds of the way down it suddenly stops. At 2/3rd down the pedal is rock solid but it feels like the booster is doing nothing. The calipers / wheel cylinders / master cylinder are all rebuilt units and brakes are definately bled properly. I have tried three used boosters with no success. This last booster holds vacuum as per factory specs under both braking and non braking conditions. Please help - running out of patience.
 

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check yer pushrod length

Mine was similar, after someone else did the brakes and swapped front for rear on the M/C, found that the pushrod between the booster wasn't adjusted properly, nor was the one inside the car where it attaches to the brake pedal. Have you bled the M/C separately? That can cause problems too--good luck.
 
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