Taylor-Dunn C0-T50-80, Service And Parts Manual

Page: 62 / 135

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Page 62
C0-T50-80
MC-T50E-02
Troubleshooting Flowcharts
Normal Hydro-boost brake units will produce certain characteristic
booster noises. These noises occur, for the most part, when the
brake pedal is manipulated in a manner not associated with everyday
braking or driving habits, The general categories of normal operating
noises are: (1) Hissing noises and (2) Clunk/Click/Chatter noises.
The Hydro—boost will emit normal hissing noises when above
normal brake pedal efforts are applied (40 lbs. pedal effort and
up). The hiss sounds are particularly noticeable with the vehicle
motionless and will increase in intensity as pedal pressure increase
above 40 lbs. and system operating temperature increases. Loud
Hissing sounds at or below normal (20-25 lbs.) pedal effort warrants
investigation.
Clunk, chatter or clicking noises will be heard when the brake pedal
is quickly released from hard (50-100 lbs.) pedal effort.