Do the brake caliper guides need to be lubricated?
The condition of the caliper guides should be checked each time the brake pads are replaced. For this you need remove the brake mechanism from the hub – the cylinder should move on the guides with little effort.
A more reliable test option is to disconnect the cylinder from the guides. In the free state, the finger must move due to the elasticity of the rubber boot.
If the finger is difficult to move, the old grease may have thickened or dirt may have entered through a damaged guard. But in any case, the whole will have to be disassembled, the parts cleaned and lubricated.
How to lubricate caliper guides?
The guide pins require special grease. It must be moisture and heat resistant (operating temperature range from -40 to +200aboutC), wear resistant at small displacements and neutral for rubber parts.
The assortment of such lubricants is not rich. But there are both imported and domestic products for sale. For example, TRW PFG110, Niglube RM, Febi 31942, Molykote 31942, as well as PAG and MC 1630 (manufacturer VMPAUTO).
There are many brake lubricants on the market, but most are designed to lubricate the side surfaces of the brake pads, allowing them to move easily along their guide. They are also called anti-cracking lubricants.
Do not confuse with guide pin lubricants. Anti-squeak agents also lubricate the rear of the brake pad, which contacts the end surface of the caliper piston.
It is easiest to control the mobility of the fingers on the brake cylinder removed from the guide. We press the finger: if it returns to its original position, the mechanism works properly.
Is it possible to lubricate brake calipers with graphite grease, lithol and other improvised means?
Using the available tools instead of the recommended special lubricant – lithol, copper, graphite grease or castor oil – will cause swelling of the rubber-plastic bushings of the guide pins. Accordingly, they will lose mobility and the brakes will wedge.
In addition, protective rubber covers swell and can detach from the landing straps.
In addition, the absence of the necessary complex of anti-seize additives in the lubricant, designed for small displacements, leads to accelerated wear of the working surfaces of the guide pins and their rapid failure.
How to lubricate guide claws?
Before applying new grease, the old grease must be completely removed. To do this, it is better to use an aerosol with a detergent. It removes fat well from deep pits in which fingers move.
A few grams of fresh grease is sufficient for lubrication. Some manufacturers produce lubricant in small sachets, 5 grams each, for this case. One of these is enough to lubricate two braking mechanisms.
Be sure to check the condition of the protective rubber boots. If there are cracks and cuts, the covers must be replaced. In this case, pay attention to the condition of the finger – if it is very worn out from dirt that got into it, it must be replaced.
Before applying new grease, the fingers and their pits must be thoroughly cleaned of old grease and wear products.
Fingers are usually sold complete with lids and grease. We recommend to buy the original or parts from the company frankit — the largest manufacturer of brake system components for European, Japanese and Korean models.
Source: Z R