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940 Must front brake bracket mounting bolts be replaced?

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Old Mar 30th, 2021, 14:25   #11
Clan
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Originally Posted by griston64 View Post
They seize in the bore. Don't know where the plastic bushes are on 940 front brakes
you are right ! The plastic bushes came into production from the 850 onwards , the 900 front callipers are a bigger version of the 300 calliper ..
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Old Mar 30th, 2021, 15:20   #12
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Originally Posted by TonyS9 View Post
Yep I just changed my disks and both lower pins were siezed, had to heat the bracket considerably to get it to move. Luckily I have a supply of spares.

This is only going to get worse as mileage reduces. I'd recommend at least yearly checks and relubrication.
I acquired my 940 in 2005 with 100,000 recorded miles. As usual I serviced the brakes ASAP and found those sliders seized but the rubber dust guards were sound. I replaced the sliders and the securing bolts, lubricating both the sliders and the rubbers with silicone grease. I strip, clean and lubricate my brakes annually, a habit I developed when I was running a Morris Marina. I did it’s brakes spring and autumn as it had a propensity for the rear drum brake pistons to seize. I learned from a Datsun owner that the manufacturer recommended lubricating the piston bores with silicone grease. Once I did that the pistons didn’t seize again.
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Old Mar 30th, 2021, 19:55   #13
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I might be telling you something you already know but make sure you remove the slider pins and give them a good clean and re grease as they often seize
Yes, thanks, good advice. I found one was seized. It needed application of heat before I could get it out of the caliper bracket. Luckily I had some spares from when I changed the calipers on my V90.
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Old Mar 30th, 2021, 20:10   #14
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I've never known stainless steel slider pins seize in their rubber/plastic bushes ???
The slider pins on my 940, judging by the rust on one that had seized, are most certainly not stainless steel. They slide directly in bores in the caliper bracket which is also steel which rusts very well. (or very badly, depending on your viewpoint). Silicone grease will lubricate them and prevent them from rusting. Silicone grease is also harmless to rubber, so no danger of grease damaging the little rubber bellows.
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Old Mar 30th, 2021, 21:41   #15
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Default 940 TIC auto 1995

Hi all i have recently fitted BREMBO front discs and pads for less than£100 all in from Euro car parts they are excellent and for that price .i have serviced my brakes every year for last. 22 years on this car only ever needed to change slider pins and bolts last year when i had new calipers fitted i used to use copper slip but now i use silocon grease as recommended .my personal opinion only !
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Old Mar 30th, 2021, 23:26   #16
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I am in the process of replacing the front discs on my 1994 diesel 940. (After a couple of years of use they produce vibrations when braking hard - I don't know why that should be.)

I normally replace the bolts for mounting the brake caliper brackets. Haynes says new bolts must be used. But somehow I have managed to lose one of the four new bolts I bought in preparation for this job.

Searching on the internet, there seem to be plenty of people who say it is not necessary to use new bolts but plenty of others who say that new bolts should always be used.

Can I confidently go ahead and replace the disks using my remaining three new bolts and one of the old bolts? Or should I order a new bolt from Skandix, pay their shipping charge, put the wheels back on and postpone changing the disks until I have four new bolts.?

Thank you for any advice.
Martin
The main reason for renewal is that the orignal bolts are what's known as "Patch bolts". In short, they are coated with thread locking compound that is activated when they are screwed into place.

You can clean the old compound off the old bolts and use something like Loctite 243 when refitting them.
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Old Mar 31st, 2021, 12:52   #17
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Originally Posted by Ian21401 View Post
I acquired my 940 in 2005 with 100,000 recorded miles. As usual I serviced the brakes ASAP and found those sliders seized but the rubber dust guards were sound. I replaced the sliders and the securing bolts, lubricating both the sliders and the rubbers with silicone grease. I strip, clean and lubricate my brakes annually, a habit I developed when I was running a Morris Marina. I did it’s brakes spring and autumn as it had a propensity for the rear drum brake pistons to seize. I learned from a Datsun owner that the manufacturer recommended lubricating the piston bores with silicone grease. Once I did that the pistons didn’t seize again.
I use silicone grease every time, it came in the volvo slider kits, it still siezes. My milage is less than 2000/yr currently.
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Old Mar 31st, 2021, 12:53   #18
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Originally Posted by Laird Scooby View Post
The main reason for renewal is that the orignal bolts are what's known as "Patch bolts". In short, they are coated with thread locking compound that is activated when they are screwed into place.

You can clean the old compound off the old bolts and use something like Loctite 243 when refitting them.
Probably good to replace when they get a bit corroded.
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Old Mar 31st, 2021, 13:08   #19
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Originally Posted by TonyS9 View Post
Probably good to replace when they get a bit corroded.
Patch bolts rarely corrode though because of the thread locking compound. However there does seem to be confusion over whether it's the actual caliper bracket mounting bolts that secure it to the knuckle the hub lives on or the caliper slider bolts........................
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Old Apr 1st, 2021, 22:40   #20
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Originally Posted by Laird Scooby View Post
The main reason for renewal is that the orignal bolts are what's known as "Patch bolts". In short, they are coated with thread locking compound that is activated when they are screwed into place.

You can clean the old compound off the old bolts and use something like Loctite 243 when refitting them.
Thanks Dave for that explanation which makes perfect sense. Much cheaper to put thread locker on the old bolts than buy new bolts.
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