Definition Of Judder (Shudder)

When diagnosing faults involving vehicle judder,(Shudder) see guidance below for a working definition of the characteristics of the condition:

• Judder is an event which occurs while carrying out low speed tight turn maneuvers (car park type driving) and transmits through the vehicle chassis in the frequency range of 30Hz to 50Hz
• The judder frequency is dull and audible and is possible to sense through the steering wheel
• The judder event is a continuous dull vibration/judder which will occur for a number of seconds. It is not a single occurrence
• Judder will NOT occur while driving in a straight line
• Judder is associated with low speed tight turn driving at low to medium throttle (junction pull-aways and car park maneuvers) and may feel like there is something sticking in the system
• At full lock, some tire scrubbing may be experienced. As the temperature drops, such scrubbing may be experienced as stick/slip judder. This is normal and does not require any service intervention