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C.H. Topping & Company
520 W. Esther St., Long Beach, CA 90813 (562) 432-0901
email: chtop@earthlink.net


12. & 13. When changing calipers or wheel cylinders the neoprene hose can be clamped with gentle line pressure, just enough to stop the flow of fluid. Stainless braided line should never be clamped in this fashion, since they have a plastic tube inside that will crack if so treated.

14. These combination valves have been cut away so you can see they contain a proportioning valve, a .9. metering valve, and a differential warning switch, to alert the driver if there is unequal pressure in the system. They have been on most American cars since the late Sixties and are a good replacements for after market manual proportioning valves.

15. Vacuum bleeding is done at each wheel cylinder or caliper by applying 17-to-20-inches of vacuum at each bleeder. This is the equivalent to about 10psi. When bleeding calipers, always have the bleeders pointed up even if you have to remove the caliper from the bracket and use a piece of wood in place of the rotor to hold the piston. The Mityvac bleeder is being used here to bleed a caliper. Simply pump the handle until 17-inches of vacuum is reached.

16. Vince Bunting of C. H. Topping demonstrates the vacuolar method of bleeding on a Deuce highboy (the lack of fenders helps in illustrating our story). This method creates a venturi effect in the can from air pressure and draws about 12 inches of vacuum at the bleeders. Note: bleeding brakes in this manner should be done by a professional who knows how to use the equipment.

17. Neward Industries makes a bottle attachment lid for their adapter plate to hold the bottle upside down on top of the master cylinder so you can bleed the brakes without running I out of fluid. It works just like a bird watering bowl, i.e., as I the fluid level goes down, more flows in to replace it.

18. DOT 3 is regular passenger car brake fluid that has a wet boiling point of 284 degrees, while DOT 4 is higher performance, with a wet boiling point of 311 degrees. Both will absorb moisture if left open and shouldn't be used after being stored in such a manner. They are designed to absorb moisture from the system, not add to it.