Correct Master Cylinder Replacement for Model A-60 Disc Brake Actuator  

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Expert Reply:

The correct replacement master cylinder for a Model A-60 Disc Brake Actuator is the Replacement Master Cylinder Assembly for Dexter Model 60 Brake Actuators part # T4820000. There's only one master cylinder, one for disc brake models and one for drum brake models. If you're having issues still after installation, I recommend making sure the brakes are bled properly without any air in the system. I have attached for you below instructions from the manufacturer on this.

"Remove the master cylinder cap on the top of the actuator and fill the reservoir three quarter full with DOT-3 brake fluid. Disconnect the trailer from the tow vehicle and hook the safety chains together to form a loop. Do not disconnect the actuator breakaway cable. Place a 2x4 wooden board into the safety chain loop below the coupler. Position the board to press forward against the actuator, use the board as leverage to force the coupler into the square outer housing of the actuator. This actuate the coupler manually and forces fluid through the master cylinder. Keep pumping the actuator until the brake fluid in the master cylinder reservoir stops bubbling.

Install a bleeder hose to the bleeder valve of the wheel farthest from the the master cylinder. Use a glass bottle to contain the fluid at the other end of the hose. Watch the fluid for bubbles. Loosen the bleeder valve one turn and pump the actuator to push the fluid through the lines until the there are no longer bubbles in the fluid inside the bottle. Repeat on each wheel but make sure the actuator does not need more fluid after each wheel."

expert reply by: Conner L

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