Bendix ex­plains brake shud­der

Motor Equipment News - - NEWS -

Lead­ing brake man­u­fac­turer Bendix ex­plains the rea­son for vi­bra­tion through the steer­ing wheel or brake pedal when you hit the brakes, and how this can be fixed.

Com­monly re­ferred to a brake shud­der, vi­bra­tion such as this arises as a re­sult of is­sues with the brake discs, prin­ci­pally with vari­a­tions in the thick­ness of the disc caused by ro­tor run out. Where the discs are un­evenly worn, the brake pads only make con­tact with the flat spots on the discs caus­ing vi­bra­tion, com­monly re­ferred to as brake shud­der.

Un­even wear­ing of the disc can be caused by a num­ber of fac­tors such as the brake calipers not open­ing cor­rectly, the ro­tors be­ing in­stalled in­cor­rectly or the proper bed­ding-in process not be­ing ap­plied fol­low­ing the fit­ting of new brake pads.

To cor­rect the is­sue of shud­der­ing it is nec­es­sary to iden­tify the source of the prob­lem.

Gen­er­ally a shud­der through the steer­ing wheel in­di­cates a prob­lem with the front ro­tors whereas a shud­der­ing or pul­sa­tion sen­sa­tion through the brake pedal in­di­cates a prob­lem in the rear brakes.

Another com­mon source of the prob­lem is an un­even mount­ing sur­face on the face of the hub which can re­sult over time through a buildup of rust and scale de­posits. Such de­posits should be cleaned off with some abra­sive ac­tion and once clean, treated with an anti-rust prod­uct such as WD40 or CRC.

Where a brake disc de­vel­ops disc thick­ness vari­a­tion (DTV) the disc must be ma­chined or com­pletely re­placed. Where it is iden­ti­fied that a caliper is hold­ing a pad against the disc caus­ing un­even wear, the seized slide pins should be eased out and lu­bri­cated with Bendix Ce­ramic High Per­for­mance Syn­thetic Lubri­cant or the cal­lipers re­placed.

Fi­nally to avoid ther­mal shock after fit­ting new brake pads a bed­ding-in process should be adopted un­less Bendix brake pads with the unique Blue Ti­ta­nium Stripe are be­ing in­stalled for which no bed­ding-in is re­quired.

“Torque­ing down the wheel nuts evenly to the ve­hi­cle man­u­fac­turer’s spec­i­fi­ca­tions us­ing a qual­ity torque wrench is also ex­tremely im­por­tant,” said Bendix mar­ket­ing ser­vices man­ager Ian Bott.

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