I’m running a pair of CRG Kalifornia karts with the 2000-Up braking system. Both karts are wearing the pads unevenly – all four pads per kart (two pads per caliper – two calipers per rotor). The tops of the pads are worn completely down while the bottoms of the pads are worn maybe 50% or less.
Is this normal? This also leads to the question of shims: I ‘ve never used them, so what is their main purpose? Any advice and/or input on the subject is appreciated.
No expert here on CRG brakes, but the pads should have worn fairly evenly from top to bottom. It seems that the lower pistons in both calipers are not functioning correctly. Suggest that you take one apart for inspection. After you remove the caliper from the chassis, but before removing the brake line, slowly pump the pistons out about 3/8 of an inch. That will make it easier to get the pistons out later. Check for worn or hard seals, and for damage to the pistons and their cylander walls. Even if all looks well, new pistons and seals wouldn’t be a bad idea. And for sure, replace all of the brake fluid. If not comfortable doing this, have your kart shop make the repairs.
Thanks Tony. I spoke with Dave Davis at CRG America and he said the 2000-up caliper will wear the pads a bit uneven. The 2000-up system has dual calipers on the rotor, but only a single piston per pad – per caliper, so I don’t think its the pistons. I’m going to mic the rotor next time I’m at the garage to see if possible the rotor has worn unevenly and may be contributing.
Common as dirt in many brake systems. Sometimes leading and sometimes trailing sides. Sometimes from heat, sometimes from pressure. Many brake caliper manufacturers vary the pressure accross the pad with multiple/different cylinder diameters.