GT rear brakes - Sliding pins - Alfa Romeo Forum
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GT rear brakes - Sliding pins

Hi all.

I thought I would rebuild my rear brakes at the weekend to get rid of the squeel but discovered that the lower sliding pin has a rubber collar that slightly expanded due to a reaction with copper grease.

I need new sliding pins but I can only find a set for the 147. I know the GT's calipers are different but are the sliding pins interchangeable?

Thanks all.
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Pins and calipers are the same between 147 and Gt,only the carriers are different to allow larger discs.
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I did, thanks, That's for a 156 though and there are a few differences.


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Originally Posted by edraven71 View Post
Pins and calipers are the same between 147 and Gt,only the carriers are different to allow larger discs.
That's what I thought but I can find a listing for 2 different sliders, 1 are 8.5mm diameter and the other is 10mm diameter. Both say 147/gt
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Just measure yours... bet they're 10mm as the 8 or 8.5 ones don't have the sleeve.
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Originally Posted by ransoman View Post
I did, thanks, That's for a 156 though and there are a few differences.




That's what I thought but I can find a listing for 2 different sliders, 1 are 8.5mm diameter and the other is 10mm diameter. Both say 147/gt
Mine has 2 different sliders on each caliper. One has a rubber sleeve and the other has no sleeve. Probably why you are getting a listing for 2 types. If you are in a difficult position you can carefully shave a little off the rubber whilst you wait on new ones. I have been told that use of copper grease doesn't help this issue.
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Just measure yours... bet they're 10mm as the 8 or 8.5 ones don't have the sleeve.
I don't have the time to strip the caliper again for a while and being NE scotland means weather windows are even rarer than spare time. I prefer to buy the parts in advance so when the planets/weather/my spare time aligns I can just whip them in.

The diagrams I have seen show the 8.5's as having the sleeve too?

I might just buy the kit and only swap out the sleeved sliders with non sleeved. I don't see the point of the sleeve other than something to Jam and a well lubricated carrier shouldn't squeel.

Thanks all.

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I finally had a weather window so have removed the pins to measure them.

So, Ebay list the correct pins for an Alfa GT as 75mm long with an 8mm diameter...

Mine has 2 different pins, the upper pin is 75mm long and has a 10mm diameter, the lower one is 65mm with a varying diameter of 8.6mm ti 9.7mm which of course is closest to the specs of a 147 kit.

I might just get the 147 kit, bin the rubber sleeved pins altogether and just fit the plain pins on the bottom too. Then I won't have to worry about the rubber locking up the caliper like every brake caliper ever made of this design (I had the same problem with a set of Land rover brakes too because of the rubber).
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Quote:
Originally Posted by edraven71 View Post
Pins and calipers are the same between 147 and Gt,only the carriers are different to allow larger discs.
So, to upgrade the rears from 251mm to 276mm all you need (apart from the disc) are the carriers and disc guards from a car with 276mm rears ?
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So, to upgrade the rears from 251mm to 276mm all you need (apart from the disc) are the carriers and disc guards from a car with 276mm rears ?
Yes, exactly what I did to mine, except I didn't bother with the disc gaurds.
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Quote:
Originally Posted by gtv160 View Post
Mine has 2 different sliders on each caliper. One has a rubber sleeve and the other has no sleeve. Probably why you are getting a listing for 2 types. If you are in a difficult position you can carefully shave a little off the rubber whilst you wait on new ones. I have been told that use of copper grease doesn't help this issue.
Depends on the grease. Anything based on mineral oil or synthetic ester will swell the sleeves. I've a high temp copper grease with PAO base and this doesn't swell any rubbers. I've also got silicone grease which doesn't swell rubbers. Took me along time to find the copper grease, use about a pound per year of the good stuff.
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I've also got silicone grease which doesn't swell rubbers. Took me along time to find the copper grease, use about a pound per year of the good stuff.
+1

When I did my brakes last month I re-greased all the pins with silicone paste.. Old pins cleaned up nicely with brake cleaner and a wire brush, then a thorough pasting and popped them back.. Lovely smooth and slick sliding motion now!
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Quote:
Originally Posted by edraven71 View Post
Pins and calipers are the same between 147 and Gt,only the carriers are different to allow larger discs.
Quote:
Originally Posted by edraven71 View Post
Yes, exactly what I did to mine, except I didn't bother with the disc gaurds.
What no guards on it ? Cant see you being able to mod the 251 ons.
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