CALIPER CLEANING TIPS
1. Work on one caliper at a time. Push out the brake pistons by removing the pads and pumping the brake lever, holding back the looser pistons with your fingers. Only push the pistons out so you can see the ‘tide line’ of brake dust, don’t go any further or the pistons may come out of the bores altogether. 2. Put on some nitrile gloves and using brake cleaner (and only brake cleaner) spray the pistons well and agitate with an old toothbrush. More stubborn debris can be removed with light use of a green scourer. 3. With all brake dust removed check the condition of the pistons for any serious pitting.
4. With a small brush thinly smear on red rubber grease around each piston. You can buy red rubber grease in small sachets from your local car accessory shop so there’s no need to buy a 500g tub of it. 5. Carefully push the pistons back into the bores with your hands, making sure there is sufficient room in the reservoir to take the fluid.