This is achieved with dampening material bonded to the pad assembly. Shims also add mass to the brake that can dampen vibrations in the pad and caliper. Shims can act as a thermal barrier to ensure consistent temperatures across the pad, which gives consistent brake torque. High quality brake shims are multilayered with varying grades of dampening materials. Engineers tune these layers to get the best NVH qualities for that specific brake system. If the shim is not making contact with the brake pad, it will not do its job.
Before installing any brake pad or shim, take time to look it over. In most cases, yes, you can reuse old shims as long as they are in good condition. There may come a day when your brake shims end up wearing out or deteriorating from excessive use. Once that happens, you will notice some strange symptoms occur.
In case your brake pads are missing shims, the same symptoms will apply. The main symptom, of course, will be a lot of loud squealing or squeaking noises coming from your brakes each time you step on the brake pedal. You may also notice a pulsating brake pedal anytime you press your foot up against it. This is because faulty or missing brake shims are causing misalignment between the pads and calipers.
The worst-case scenario will be a limited brake response, but that should only happen if your brake pads are not able to sufficiently access the brake rotors. This is due to the brake pads not being properly aligned with the brake calipers. Because of this, the brake pads cannot adequately interact with the brake rotors to slow down the vehicle in time. On top of that, this can also wear out your brake pads and calipers quicker than normal. Well explained,thank you,as have had a banging coming from all wheels only since I had the brakes done no noise before,a friend had same problem and he got his brakes done at same garage,he went elsewhere to be told the shims had been replaced,garage sorted this,took no money from my friend and banging noise was gone so I was checking out what shims were and you explained it spot on,thank you.
If you are low on the dinero buy you some intermediate pads,those usually are real nice but always use your brake grease, usually at your neighborhood part store at the counter they will have a little rack with all kinds of little bags with stuff like brake grease, dielectric grease for your spark plug boots and so forth, that stuff is not there for looks, it works and its cheap, usually a 99 cent little bag will do a set of front or rear brakes if you squeeze it hard enough.
Carlos, I agree. I grease the back of my pads and the parts that contact the caliper hardware and have never had an issue with excessive brake noise. Although it is not so common these days, over the past 40 years many people have worked on their own cars, buying the parts at a nearby auto parts store. Listening to good advice, doing it yourself a few times, enjoy the wonderful feeling of freedom, and control over your own money!
I have install discs and brakes on all 4 corners and had to fit 2 sets of pads and 3 sets of shims. Additionally, lubricants do not insulate against vibration and are ineffective for some frequencies. Staying power is what special-purpose brake lubricants have over other lubricants.
Specially formulated, high-temperature brake grease can withstand the heat, and also not harm rubber seals or plastic bushings.
Why Does This Matter to You? The design of the shim, backing plate and the shape of the friction material are dependent on the caliper, suspension and the formulation of the friction material.
Advertisement There is no way to say one brake pad shim is better than the other regarding noise or even cost, unless you have a testing laboratory that can test the entire vehicle.
The design of the shim and brake pad is the product of the vehicle. Some brake pads and shims look great coming out of the box, but the engineering might be ill suited to the application.
The final judge of the quality of a shim and brake pad is the technician. Take the time to go on a test drive after the pads are installed on the vehicle. Just pumping up the pedal and backing it out of the bay is no way to ensure that there will be no problems with the brakes when the customer picks up his or her vehicle. Wheel End: 4X4 Locking Hubs. Digital Edition. Contact Us. Shop Owner. Special Content Video Podcasts Webinars.
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