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Caliper slide pin #5464546 06/27/20 10:49 PM
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painfx Offline OP
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Does anyone know the purpose of the rubber bushing on the caliper slide pins? It is usually located on the top slide pin only for some reason. Also what happens if we remove the rubber bushing, any benefits or side effects?

Thanks

Re: Caliper slide pin [Re: painfx] #5464551 06/27/20 10:58 PM
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Hall Offline
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Noise, vibration, does nothing, no one knows, .... There's varying opinions on them. This gets asked a fair amount....

I'm of the opinion that the brake engineers had a reason to design these into the part. Just because no one is 100% sure what that reason is doesn't mean they're not needed either.

Re: Caliper slide pin [Re: painfx] #5464557 06/27/20 11:02 PM
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user52165 Offline
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Why would you even consider removing an item designed to keep the grease in and nasty items out?

Re: Caliper slide pin [Re: painfx] #5464558 06/27/20 11:02 PM
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WyrTwister Offline
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To keep put water , mud , dirt , etc. ?


Wyr
God bless
Re: Caliper slide pin [Re: painfx] #5464569 06/27/20 11:20 PM
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UG_Passat Offline
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Originally Posted by painfx
Does anyone know the purpose of the rubber bushing on the caliper slide pins? It is usually located on the top slide pin only for some reason. Also what happens if we remove the rubber bushing, any benefits or side effects?

Thanks

on VW's it's how they call it a semi-floating caliper design, which uses rubber on both guide pins guides.

Removing it and replacing it with a harder material.. less flex, and interestingly enough wears out the pads quicker and more evenly.

http://www.tyrolsport.com/braking/tyrolsport-brake-caliper-stiffening-kit-for-vw/audi/


2016 VW Tiguan
Re: Caliper slide pin [Re: painfx] #5464581 06/28/20 12:03 AM
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Kibitoshin Offline
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To reduce caliper rattling and slapping in floating caliper designs. There is no effect removing the bushings maybe lesser drag. My 02 Silverado had them in both lower and upper pins in the front calipers. When I used the wrong grease they swelled up so I removed them. Later caliper designs got rid of the bushing and opt for a tighter pin fit in the caliper bracket.

Last edited by Kibitoshin; 06/28/20 12:06 AM.

Shin Gekiretsu Shin'ou'hou
02 Chevy Silverado C1500 V8 5.3L
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Re: Caliper slide pin [Re: painfx] #5464597 06/28/20 02:03 AM
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Silk Offline
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It's usually on the leading pin, and slows the application so the trailing edge of the pad touches first, stopping squeal and evening pad wear.


1987 BMW R65 - Penrite VTwin 20-50
2005 Nissan Expert - 5W-30 Castrol Edge
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: Caliper slide pin [Re: painfx] #5464669 06/28/20 07:32 AM
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Kira Offline
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Thanks for that.

Re: Caliper slide pin [Re: painfx] #5464854 06/28/20 12:14 PM
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Yah-Tah-Hey Offline
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Takes up the small space between machined hole and pin to stabilize caliper. Replace with OEM part only. And don't use any of the Permatex brake goops. They swell the bushing. Know from experience. NO goops. eek

Re: Caliper slide pin [Re: user52165] #5464878 06/28/20 12:54 PM
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Hall Offline
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Originally Posted by user52165
Why would you even consider removing an item designed to keep the grease in and nasty items out?

You're referring to the rubber boot. That's not what the OP is asking about.

Re: Caliper slide pin [Re: Silk] #5465270 06/28/20 10:31 PM
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painfx Offline OP
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Originally Posted by hallstevenson
Noise, vibration, does nothing, no one knows, .... There's varying opinions on them. This gets asked a fair amount....

I'm of the opinion that the brake engineers had a reason to design these into the part. Just because no one is 100% sure what that reason is doesn't mean they're not needed either.


Right, I am here to find out the reason why.

Originally Posted by user52165
Why would you even consider removing an item designed to keep the grease in and nasty items out?


Why only the top pin has it and not the bottom?

Originally Posted by Kibitoshin
To reduce caliper rattling and slapping in floating caliper designs. There is no effect removing the bushings maybe lesser drag. My 02 Silverado had them in both lower and upper pins in the front calipers. When I used the wrong grease they swelled up so I removed them. Later caliper designs got rid of the bushing and opt for a tighter pin fit in the caliper bracket.


This is what had happened to my friend's ES330. His top pin bushing where seized. Removed the pin out and they were swollen. Then he removed it, no more seize and the braking force is better than before. So he was wondering if he can just drive without the rubber bushing on the pin.

Originally Posted by Silk
It's usually on the leading pin, and slows the application so the trailing edge of the pad touches first, stopping squeal and evening pad wear.


Is that your final answer?

Re: Caliper slide pin [Re: painfx] #5465276 06/28/20 10:40 PM
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painfx Offline OP
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Why is there only 1 rubber bushing on the top slide pins and not on the bottom?

Re: Caliper slide pin [Re: painfx] #5465305 06/29/20 12:33 AM
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Silk Offline
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Originally Posted by painfx
Why is there only 1 rubber bushing on the top slide pins and not on the bottom?


I think I explained that - it's the leading pin.


1987 BMW R65 - Penrite VTwin 20-50
2005 Nissan Expert - 5W-30 Castrol Edge
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: Caliper slide pin [Re: Silk] #5465461 06/29/20 08:43 AM
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painfx Offline OP
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Originally Posted by Silk
Originally Posted by painfx
Why is there only 1 rubber bushing on the top slide pins and not on the bottom?


I think I explained that - it's the leading pin.


There are vehicles have top and bottom.

Re: Caliper slide pin [Re: painfx] #5466021 06/30/20 12:57 AM
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Silk Offline
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Yes, and some have none, and Toyota have it on the trailing pin. Confusion will be your epitaph.


1987 BMW R65 - Penrite VTwin 20-50
2005 Nissan Expert - 5W-30 Castrol Edge
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
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