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Zero Motorcycles Forum | 2013+ / Re: Critical Zero DSR Brake failure
« on: November 30, 2023, 04:04:22 PM »
An intermittent fault of the brake is almost certainly related to a ABS module malfunctioning. There are valves inside the ABS pump that separate the master cylinder from the calipers. When the system activates these valves close and another set of valves open to allow the ABS pump to control the fluid pressure provided to the calipers. As brake fluid can not be compressed when the circuit is blocked it will result in you being unable to pull the lever.
The easiest way to test this is to either unplug the ABS or remove the fuse providing it power.
That had been suggested by the dealer as well, I am still in the "after reparation" mode, testing if they did a good job. If the problem returns, i will unplug the module and test again. the weather here has turned frosty, not really motorcycling conditions, so i have to wait until March.
This suggestion does not make sense, unless all of the pistons are completely frozen and unable to move. If one piston is locked up the fluid pressure provided by the lever would still actuate the other pistons.
no that is exactly what the dealer and myself agreed upon, it doesn't make sense, but the Zero HQ insisted on checking the caliper.
The easiest way to test this is to either unplug the ABS or remove the fuse providing it power.
That had been suggested by the dealer as well, I am still in the "after reparation" mode, testing if they did a good job. If the problem returns, i will unplug the module and test again. the weather here has turned frosty, not really motorcycling conditions, so i have to wait until March.
This suggestion does not make sense, unless all of the pistons are completely frozen and unable to move. If one piston is locked up the fluid pressure provided by the lever would still actuate the other pistons.
no that is exactly what the dealer and myself agreed upon, it doesn't make sense, but the Zero HQ insisted on checking the caliper.