940 Must front brake bracket mounting bolts be replaced?

[martin calva]

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

[griston64]

Originally Posted by martin calva

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

That will be fine As long as they are correctly torqued up one old bolt won't make any differnce. Good practice to always use new and you can order them from your local main dealer

Cheers, Mark

[Ian21401]

I only replace the caliper bracket bolts if they are damaged. If the existing ones are in good condition I replace them with some thread lock and obviously torque them up correctly. I haven’t had any problems yet.

[martin calva]

My thanks Mark and Ian.

in fact the job of changing the disks is on hold for the moment. After removing one of the disks and the bracket, I discovered that the disks I bought are the wrong size of the two possible sizes for the 940. So the old disk went back on while I await new disks.

T

[griston64]

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

[TonyS9]

Originally Posted by griston64

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

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.

[Clan]

Originally Posted by griston64

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

I've never known stainless steel slider pins seize in their rubber/plastic bushes ???

[griston64]

Originally Posted by Clan

I've never known stainless steel slider pins seize in their rubber/plastic bushes ???

They seize in the bore. Don't know where the plastic bushes are on 940 front brakes

[360beast]

Originally Posted by Clan

I've never known stainless steel slider pins seize in their rubber/plastic bushes ???

I've just had to unseize a rusted slider on the 1991 940 GL I've been working on, the rubber boot was split allowing moisture in.

See post 106

https://www.volvoforums.org.uk/showt...311775&page=11

[griston64]

Originally Posted by 360beast

I've just had to unseize a rusted slider on the 1991 940 GL I've been working on, the rubber boot was split allowing moisture in.

See post 106

https://www.volvoforums.org.uk/showt...311775&page=11

Both my lower sliders were seized. I bought new ones from FRF.