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Power Brake Frontside Push Rod Adjustment
Recently another member suggesting adjusting the push rod on the frontside of a 68 PB Booster. This is a result of mis-information repeated after the same 1963 Corvette shop manual photograph was used in later manuals. I’ll explain. Some of the 1963 Corvettes used a Moraine PB Booster that indeed had a small adjustable hex headed screw in the tip of the frontside rod that pushes against the master cylinder piston. All 1964-1967 and 1968-1982 Corvettes DO NOT have that adjustment feature on the frontside push rod.
However, if one looks at later factory manuals, that 1963 picture is usually used. When the Chilton, Clymer derivative books regurgitated these factory books, the same error was propagated again and again. It infers all the subsequent model had a frontside adjustment, but they simply did not.
Yesterday a member asked me for an exploded view of the 68 Corvette master cylinder showing the complete guts. I looked in my 68 Corvette part manual, and it showed a generic dual circuit master cylinder. Looking in the Corvette section of the Chassis manual shows another slightly different dual circuit master cylinder. I sent him both copies with notes to clarify the differences. There is no substitue for hands on experience. “You simply cannot book learn a Corvette.”
Geoffrey Coenen
Recently another member suggesting adjusting the push rod on the frontside of a 68 PB Booster. This is a result of mis-information repeated after the same 1963 Corvette shop manual photograph was used in later manuals. I’ll explain. Some of the 1963 Corvettes used a Moraine PB Booster that indeed had a small adjustable hex headed screw in the tip of the frontside rod that pushes against the master cylinder piston. All 1964-1967 and 1968-1982 Corvettes DO NOT have that adjustment feature on the frontside push rod.
However, if one looks at later factory manuals, that 1963 picture is usually used. When the Chilton, Clymer derivative books regurgitated these factory books, the same error was propagated again and again. It infers all the subsequent model had a frontside adjustment, but they simply did not.
Yesterday a member asked me for an exploded view of the 68 Corvette master cylinder showing the complete guts. I looked in my 68 Corvette part manual, and it showed a generic dual circuit master cylinder. Looking in the Corvette section of the Chassis manual shows another slightly different dual circuit master cylinder. I sent him both copies with notes to clarify the differences. There is no substitue for hands on experience. “You simply cannot book learn a Corvette.”
Geoffrey Coenen
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