11.9. Disk brake mechanisms - the general informationThe principle of functioning of disk brake mechanisms is extremely simple: when squeezing a pedal of a foot brake rigidly jointed with wheel assembly the brake disk made of cast iron densely is clamped between two blocks equipped with frictional slips. Modern brake disks have the ventilated design that considerably increases efficiency of the heat sink from assembly and prevents a dangerous overheat of components. The centrifugal force arising during rotation of a wheel reliably protects working surfaces of a disk from education on them any sort of mud deposits that guarantees the uniformity of a clip of blocks providing smoothness of braking of the vehicle.
Adjustment of disk brake mechanisms is made automatically and is put in an assembly design. Distinguish three various types of disk brake mechanisms:
· With the fixed support;
· With the sliding support;
· With a floating bracket.
The fixed supports have a two-cylinder design in which two separate pistons press frictional blocks to both parties of a brake disk. Actually the support case at the same time is installed rigidly and is not mobile at all.
Mechanisms with the sliding support and a floating bracket by the principle of action practically do not differ from each other, - in both designs the internal block nestles on a brake disk by hydraulic effort, at the same time actually the support case / a floating bracket, in this case rigidly not recorded, is slightly displaced in an opposite direction, the return end pressing the second block to the outer side of a disk. Various ways of fastening of this sort of supports can be used, - some are equipped the assembly located from above or from below with an axis, on others as guides of sliding fixing bolts are used.