Slide pins

[Funkyboy]

Just servicing my rear brakes as noticed a bit of binding after a long journey.
Brake pads couldn't move freely. One other thing I noticed was the caliper pins were really stiff in the rubber boots but the boots were clear of any obstruction and the lube made no difference. I removed the boots to find a build up of white powder between the boot and the metal of the calliper. Cleaned it all out and replaced boots and pins now move super easy. Anyone had this before or know what causes it?

Thanks

 

[Wighty]

Just servicing my rear brakes as noticed a bit of binding after a long journey.
Brake pads couldn't move freely. One other thing I noticed was the caliper pins were really stiff in the rubber boots but the boots were clear of any obstruction and the lube made no difference. I removed the boots to find a build up of white powder between the boot and the metal of the calliper. Cleaned it all out and replaced boots and pins now move super easy. Anyone had this before or know what causes it?

Thanks

Powdery reaction from the metal , had the same on mine when replaced the rubber parts of my calipers.

 

[Funkyboy]

Powdery reaction from the metal , had the same on mine when replaced the rubber parts of my calipers.

It's really builds up and restricts the movement of the pins doesn't it. Never seen any mention of it before on the numerous YouTube videos. It really should be part of the routine maintenance of the braking system

 

[brandwooddixon]

I take it as routine maintenance to check, clean and lubricate the slide pins. With the use of alloy callipers, its best to avoid Copperslip type anti seize compounds and instead select a proper brake/rubber friendly grease for them.

 

[Funkyboy]

I take it as routine maintenance to check, clean and lubricate the slide pins. With the use of alloy callipers, its best to avoid Copperslip type anti seize compounds and instead select a proper brake/rubber friendly grease for them.

The slide pins were lubricated. It was between the rubber boot and the caliper housing that the powder substance had built up push against the rubber making the pins too tight

 

[Wighty]

The slide pins were lubricated. It was between the rubber boot and the caliper housing that the powder substance had built up push against the rubber making the pins too tight

I had to get some sandpaper on mine to clean that build up so I could get the new rubbers in there .