The disc brake consists of steel or cast-iron disc, which is attached to and rotates with the wheel hub. The disc is straddled by the caliper with a friction pad on each side. When the brake pedal is pressed, the pads are moved hydraulically in from each side to grip the disc and thus slow the wheel.

The disc brake requires no routine maintenance or adjustment, however although the disc pads have a long life, it is advisable to check them on a regular basis. Renew them if the friction material is worn down to about 2mm thickness, failure to do so will result in damage to the disc itself and could end up in an expensive repair. Both sets of pads must be changed or it will result in uneven braking. Do not take chances - always fit the best quality pads.

The pads are easily replaced, all you need is a new set of ATE pads to suit your vehicle, a bottle of Midas brake fluid, a pair of pliers, a punch, a 6mm or 7mm Alan key depending on the type of caliper.

Method:

• Step 1. Jack up the car and remove the wheel, always use axle stands for safety. Secure the hand brake and chock the wheels on the opposite side of the vehicle.

• Step 2. Wrap a thick absorbent cloth around the brake fluid reservoir to soak up any fluid which may be forced out. Remove the reservoir cap.

• Step 3. On the fixed caliper type, there are usually two pistons and two guide pins. Remove the clips on the guide pins with pliers and tap out the pins with the punch and hammer. Now you are able to pull out the pads, if they are tight use pliers.

  On the floating caliper type you have to remove the pistons housing to change the pads. Unscrew the guide pins with an Alan key, slide off the caliper housing, catch the retaining spring as it comes off. Remove the worn pads, the outside first.

• Step 4. Check the caliper and pistons for damage or leaks. If they are damaged put the pads back and consult a specialist.

• Step 5. Force back the piston with the correct tool or a smooth piece of wood. Take care not to damage the piston rubbers.

• Step 6. Fit the new pads, the outer one first, replace the retaining plates and refit the caliper housing and the guide pins, clip or tighten in place.

• Step 7. Refit the wheel and lower the vehicle. Pump the brake pedal a few times to bring the new pads into contact with the pistons, remove the cloth from around the reservoir, check the brake fluid level, top it up with clean brake fluid if necessary and replace the cap.

  Since new brake pads have to bed in initially, avoid violent braking for the first 200km. Remember brake pads are Safety Critical Components, regular inspection is essential for your safety.

INDEMNITY
Remember this is for information only, for more details consult the workshop manual for your vehicle.