Brake shoe Drum brake

-


brake shoes typically made of 2 pieces of steel welded together. friction material either riveted lining table or attached adhesive. crescent-shaped piece called web , contains holes , slots in different shapes return springs, hold-down hardware, parking brake linkage , self-adjusting components. application force of wheel cylinder applied through web lining table , brake lining. edge of lining table has 3 “v -shaped notches or tabs on each side called nibs. nibs rest against support pads of backing plate shoes installed. each brake assembly has 2 shoes, primary , secondary. primary shoe located toward front of vehicle , has lining positioned differently secondary shoe. quite often, 2 shoes interchangeable, close inspection variation important.



brake shoe assembly


linings must resistant heat , wear , have high friction coefficient unaffected fluctuations in temperature , humidity. materials make brake shoe include, friction modifiers (which can include graphite , cashew nut shells), powdered metal such lead, zinc, brass, aluminium , other metals resist heat fade, binders, curing agents , fillers such rubber chips reduce brake noise.


in uk 2 common grades of brake shoe material used available. don 202 high friction material did not require brake power servo. disadvantage lining prone fading on steep hills (calculate kilowatts dissipated one-ton car descending 15% hill @ constant 60 mph) harder lining, famous vg95 produced required brake servo. other snag parking brake fail annual mot test unless high friction linings installed test.







Comments

Post a Comment

Popular posts from this blog

Independence United Arab Emirates

-
historic photo depicting first hoisting of united arab emirates flag rulers of emirates @ union house, dubai on 2nd of december 1971. zayed bin sultan al nahyan first president of united arab emirates , recognized father of nation. by 1966, had become clear british government no longer afford administer , protect united arab emirates. british mps debated preparedness of royal navy defend sheikhdoms. secretary of state defence denis healey reported british armed forces overstretched , in respects dangerously under-equipped defend sheikhdoms. on 24 january 1968, british prime minister harold wilson announced government s decision, reaffirmed in march 1971 prime minister edward heath end treaty relationships 7 trucial sheikhdoms, had been, bahrain , qatar, under british protection. days after announcement, ruler of abu dhabi, sheikh zayed bin sultan al nahyan, fearing vulnerability, tried persuade british honour protection treaties offering pay full costs of keeping british armed forces i
Read more

History Alexandra College

-
alexandra college (on right) circa 1890 the school founded in 1866 , takes name princess alexandra of denmark, school s patron. school colours, red , white, adopted danish flag in honour. alexandra college founded anne jellicoe, quaker educationist, in name of furthering women s education. under anne jellicoe, school grew small establishment focused on providing governess-style education irish protestant ladies pioneering force women s rights , education, providing education women equivalent available in boys schools, grounding in mathematics, history, classics , philosophy. alexandra settled role, anne jellicoe convinced major obstacle liberal education of women exclusion university campus. passionately believed until women admitted trinity college dublin (founded in 1592), voice of women not commonly heard in politics, literature or in academic debate. the royal university of ireland act 1879 allowed females take university degrees on same basis males. students prepared examination
Read more

Management School of Computer Science, University of Manchester

-
^ anon (2010). dai edwards: helping turing use manchester mark 1 . www.bl.uk. british library.  ^ anon (2014). voices of science: david dai edwards. born david beverley george edwards, 1928 . www.bl.uk. british library. archived original on 2014-01-16.  ^ kilburn, t. (1951). new universal digital computing machine @ university of manchester . nature. 168 (4264): 95. doi:10.1038/168095a0.  ^ lavington, simon (2001). obituary: tom kilburn (1921–2001) . nature. 409 (6823): 996. doi:10.1038/35059201. pmid 11241994. 
Read more