Prior Preparation:
-Always park your car in a suitable area with adequate workspace when attempting a brake pad change. Secure the Handbrake and disengage gear to neutral, prior to jacking the car up.
-Now block the cars rear wheels so it won't roll once you jack it up onto the axle stands!
-Spread your tools out and select a wheelbrace, moving to one of the front wheels. The wheelbrace is a metal bar with a socket on the end for removing wheelnuts. It will usually come with your cars toolkit, however if you don’t have one, a socket set purchase will be necessary!
-Its always a good idea before jacking the car up, to loosen the wheel nuts first, whilst the car still rests on the ground. Usually the nuts will be tight, so trying to loosen them whilst the wheel is in the air will create some problems, (i.e. the wheel will keep spinning around!). Grab your wheel brace and proceed to loosen the nuts, however don’t take them off fully, loosen them just enough until they can later be removed by hand.
-Jack the car up in a suitable, supported area of the cars chassis. Recommended areas to jack the car up will be detailed in your cars, owners manual. Make sure you use the chassis as a jack point for trying to lift the car! Never work on a car which has been elevated by only a hydraulic jack. Place both axle stands under each end of the main front axle, lowering the car onto the stands
Removing old brakes:
-Now that the car is supported firmly on the stands, you can progress to remove the wheel! The already loosened wheel nuts can be removed by hand, and when taken off make sure to place them in a cardboard box or in a drawer so you can find them at a later stage!
-Remove the wheel slowly and place it under the cars door nearest the wheel you are working on. You can never be careful enough when working on a suspended car, in addition to the axle stands and jack you are using, its always a good idea to have that wheel there, in case a faulty axle stand, broken jack etc lets you down and could result in the car falling! Taking these small yet extremely relevant safety steps are extremely necessary.
-Now that you have removed the wheel entirely, a brake system assembly should be visible before you.(or if not your in trouble!). The braking system consists of a brake caliper, two brake pads and a brake disc.
-As the diagram illustrates, the brake caliper is attached to the brake disc. Inside the caliper are two brake pads which need changing. When you press the brake lever in your car, the caliper will squeeze the brake pads onto the brake disc, in turn slowing them down, and effectively then the wheel. Imagine a CD spinning around, where a hand then from either side clamps onto it slowly, that has the same principle as the braking system.
-There will be bolts which fix the caliper in place and prevent movement. Remove these bolts (spanner size requirements will vary on different cars, investing in a socket set is again advised!) and take the caliper away from the brake disc. You should now have the brake pads within vision through the caliper.
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