The Brakemeter / Dynometer is a hand-made precision instrument that mechanically measures both deceleration and acceleration.  The instrument consists of a finely balanced pendulum, free to respond to any changes in speed or angle, working through a quadrant gear train to rotate a needle round the dial.  The dial is black with silver white graduations and has a linear length of 5 1/2 inches (114 mm).  The unit is filled with a special fluid which damps out all vibration.  Other than a calibration every 2 years, which is carried out by Bowmonk, no maintenance is necessary. 

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The dial is calibrated in percentage "G", the accepted standard throughout the world for measuring acceleration and deceleration. There are no connections to the vehicle other than mounting - either with two self-tapping screws onto a heavy stand or by using the suction cup operated by the small side lever.

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In the UK, Bowmonk brake meters are approved by the DVSA for use in the annual MOT vehicle-testing scheme.  Wherever brake testing is mandatory by law the Bowmonk Brakemeter/Dynometer is an approved brake test instrument.  We are a fully approved UKAS testing laboratory and we recalibrate and repair the Brakemeter/Dynometer, the Tapley meter, and our newer electronic decelerometers.