BRAKES

TYPES OF BRAKES

MECHANICAL BRAKESHYDRAULIC BRAKESVACUUM-ASSISTED BRAKESAIR PRESSURE ASSISTED BRAKESAIR PRESSURE BRAKESHYDRAULIC DISC BRAKES

MECHANICAL BRAKES

BLOCK OR SHOE BRAKE

BAND BRAKE

The torque capacity of the band brake =M = (T1- T2) r For the Normal Band Brake arrangement shown the relationship between the actuating force and the slack side belt tension isFi= T2. b /a

BrakeTorqueCapacityM = (T1- T2) r

Differential Band Brake

INTERNAL EXPANDING SHOE BRAKE

HYDRAULIC BRAKES

VACUUM ASSISTED BRAKESPOWER CYLINDER ASSEMBLYDIAPHRAGMMASTER CYLINDERVALVEBRAKE PEDALLINKAGESLINKAGES

AIR PRESSURE ASSISTED BRAKES

AIR PRESSURE BRAKESAIR-COMPRESSORHOSEUNLOADER VALVEAIR TANKPRESSURE GAUGEBRAKE VALVEHAND CONTROL VALVEBRAKE CHAMBERBR.OPR.RODSLACK ADJUSTER

DISC BRAKES

Full-contact Disc brakes (concept)

Initially brake pad have only contact about 15% of the rotor surface at any one time. With a change of design, New Tech have been able to add 5 more pads to the system so that 75% of the brake rotor is in contact with the pads at any one time.

MATERIAL FOR BRAKE PADOrganicThese pads are well-suited for street driving because they wear well, are easy on the ears, dont chew up the rotors and dont spew dust everywhere. Theyre favoured for your average family saloon because they work well when theyre cold. Of course the drawback is that they dont work so well when they get hot.Semi-metallic / sinteredThis is a good compromise between street and track. These seem to be the pad of choice for sportier vehicles such as the Subaru Impreza WRX. They wont work as well as organic pads when they are cold, so you need to be a bit wary of the first couple of stops. Conversely they do work well when hot. Occasionally the weak link in semi-metallic pads is the bonding material that holds the friction pad to the backing plate. There have been occasions where the friction material has come away completely. Thats infrequent though.

MetallicThese pads are typically reserved for racing or the extremely rich. They squeal and dust like crazy, are hard on rotors and dont work well when cold.CeramicCeramic pads still have metal fibers (about 15% vs. about 40% for semi-metallic) but they are copper instead of steel and therefore cause less wear and transfer heat better. They dont fade as easily as other pads, cool faster, last longer, and are effectively silent, as the sound they genereate is outside of the human range of hearing. Dogs will go crazy thought. The dust created by ceramic pads is also very light in color so your wheels look cleaner.

REFERENCES

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