What kind of grease is used for brake guide pins?
2 Answers
Brake guide pins typically use calcium-based grease (butter) with certain water resistance. More details are as follows: Exposed guide pins: During rainy seasons, vehicles often drive through water. Calcium-based grease has some water resistance and won't dissipate due to water, ensuring the braking system functions properly. Engine oil is strictly prohibited for brake caliper guide pins as it easily washes away with water. Guide pins losing lubrication may seize up, causing brake failure. Function: The guide pins of brake calipers allow brake pads to act perpendicularly on brake discs under the force of brake pistons. The rubber boot protects the guide pins from exposure. If exposed, they are prone to rust from water and wear from dust and sand.
Brake guide pins must be lubricated with specialized high-temperature silicone-based grease. Ordinary grease can melt under the high temperatures of brake discs, potentially contaminating brake pads and affecting braking performance. Having performed numerous vehicle maintenance sessions myself, I recommend products like CRC SylGlide, which can withstand high-temperature environments without failing. When applying, always clean off old grease and dust first, otherwise the new grease won't work effectively. Stuck guide pins can lead to uneven braking force. Improper lubrication may cause squeaking noises or steering wheel vibrations while driving. It's advisable to check the condition of guide pins every two years to prevent unexpected braking issues and extend brake system lifespan. The DIY process is straightforward - just spray with brake cleaner and apply a small amount of specialized grease, but avoid over-application to prevent dripping onto brake discs, which could be hazardous. Remembering this critical detail will ensure safer and more reliable driving.
