Question about 2008 Kia Sportage 2.0
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Posted on Jan 02, 2017
SOURCE: noisey brakes kia sportage
On assembly of disc brakes there is an anti vibration silicone place on the back of the brake pads. The two surfaces rubbing togerher at a centain speed creates a high frequency vibration that at first is above your hearing range at the higher soeed you are slowing dow from. A the speed of the rotor rotation decreases, the frequency vibratio changes and the frequency falls with audible range. Like wiping a piece of glass with a paper towel. Ever wonder why paper and glass would screech?
The sound goes away with harder application because you are actuallly dampening/altering the frequency out of the range of irritability.This dampening compound is used in assembly at the factory and needs to be applied to the brake disc metal side when new pads are installed. This ultra sound is coming or caused by the brake psd that is against the caliper piston. This is because the pad against the piston has more center pressure than full surface pressure as the pad hasand any vibration is telegraphed th to Caliper. The compound I mentioned is a silicone that actually absobs and dampens vibrations when it dries. A rubber (siliucone) vibration sponge. Alot of mechanics, but not all, will leave this compound out of the assembly because it just another step and a messy one to boot, Or to put it plainly, laziness and the lack of knowledge of purpose and importance> Good Luck, having the pads replaced and properly installed will get rid of your screeching.-Ned-
Posted on Aug 23, 2009
hi from the uk have had this problem on a customers car b4 who had replaced frot calipers and pads and pedal went to floor on inspection of caliper i found that the steel spring clip that fits into two holes in the front face of caliper and must also locate behind the caliper carrierbehind two lugs was fitted incorrectly it had been fitted behind the outer pad resulting in when brake pedal off ?the caliper being floating type as it is known because it is fixed by two screw pins/bolts and moves on these pins/bolts as pads wear ? what happens is the spring fitted wrongly ? actually pushes against the outer pad and as a result the caliper piston is pushed back into its cylinder slightly as it moves on the locating pins/bolts resulting in pedal going to floor on 1st application but if pumped ? some brake pedal force is felt but is lost again when pedal released ? so try this ? remove the steel clips from both front calipers that retain caliper to carriers then press brake/pump pedal ? if as suggested above works? your pedal should pump up and remain ok when you release and still be firm when re applied ? all above is what i found on ford ford but many other models use similar calipers and spring locating recheck how this spring should locate hope this helps ? good luck
Posted on Mar 19, 2010
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