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8 & 10 cyl Bristol cars Type 407 onwards - restoration, repair, maintenance etc

410, 411, 412 servos

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Old 25-04-21, 09:44 PM
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Back in the '80s I was told my old 4.5:1 units were beyond repair and I was sold a more modern pair of servos that must be a much lower ratio as the pedal pressure required for given braking effort was far higher straight after they were replaced.

The long and short is that I don't have suitable units to trade in but would like to get the brakes back to something approaching original spec. At the moment a pair of 4.25 : 1 units look like my best bet. Other suggestions or reasons not to do this gratefully received.
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