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/PT 10-0005.pdf
JDA5237 PT 10 0005 Brake Hose May Cause Low Pedal All vehicles with power brakes How to diagnose a sinking low or spongy brake pedal 1 Begin by isolating the master cylinder Remove the lines from the master cylinder and insert blocking plugs into the ports Press on the brake pedal If the pedal is firm and hard the master cylinder is good If the pedal still drops either air is in the unit or it is bypassing internally Bleed the unit or replace as necessary Reconnect and bleed the system 2 With a properly bled master cylinder test the brake hoses Using a proper tool carefullypinch off all the rubber brake hoses as close to the master cylinder as possible Release one brake hose at a time Press the brake pedal If the brake pedal is firm and hard move to the next circuit Repeat until the circuit containing the defective component is located the brake pedal will be soft or sinking Replace defective components as necessary 3 Flush the system thoroughly with fresh brake fluid from a sealed container according to the manufacturer s service procedures Application Problem Solution Pinch off hose close to master cylinder Flush system with fresh brake fluid after repairs Contaminated Fluid
