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front disc rotor retaining bolt ? Topic is solved

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

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subzerocarfanatic
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front disc rotor retaining bolt ?

Post by subzerocarfanatic » Mon Mar 23, 2020 10:00 am

I am installing new brake lines on the front and have a question I did not mention before when installing new rotors and pads, is there supposed to be a 10mm bolt that screws through the rotor to the hub to hold it in place? I noticed on a video i saw on another Volvo they removed a 10mm bolt,my rotors have a hole there for a bolt it appears but there was none on either side when I removed the original rotors.

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Re: front disc rotor retaining bolt ?  Topic is solved

Post by scot850 » Mon Mar 23, 2020 10:14 am

There is a hole. There is a bolt with a 10mm head on it. The only real purpose of the bolt is to maintain the rotor aligned with the lug bolt holes when you remove the wheels. In older models there was a bolt with a pointed end which helped you to align the wheel which had a hole in it. Many people don't use the bolt as in areas where there is a lot of salt used the bolts will seize in place making bolt removal next to impossible or the heads shear off. That may be what happened in your car. Lucky thing is that some of the axle hubs have 2 holes 180 degrees from each other. If you do re-install the bolts, try using some copper grease to reduce the chances of rusting in place.

Good Luck,

Neil.
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Re: front disc rotor retaining bolt ?

Post by subzerocarfanatic » Mon Mar 23, 2020 10:34 am

Thanks Neil. I am just trying to restore everything on this poorly neglected car and $1500 later i'm just about there.

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Re: front disc rotor retaining bolt ?

Post by abscate » Mon Mar 23, 2020 10:51 am

Tech tip - these only need to be finger tight. I wrench them down to seat the rotor then remove the ratchet handle so they arent more than hard finger tight - 6.28496 finger pounds.
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Re: front disc rotor retaining bolt ?

Post by subzerocarfanatic » Mon Mar 23, 2020 11:19 am

I don't have the bolts that go there, I was just curious if they were supposed to be there and if necessary.Though i would use them if i had them. lol

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Re: front disc rotor retaining bolt ?

Post by RickHaleParker » Mon Mar 23, 2020 4:08 pm

Sometimes the center bolt gets removed to install certain aftermarket wheels. The PO removes the aftermarket wheels before selling the car and cannot find the center bolt.
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Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger, Plant Ghent Belgium.

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Re: front disc rotor retaining bolt ?

Post by jreed » Mon Mar 23, 2020 4:17 pm

A few years back I twisted off one of those guide pins and lived to tell the tale here:

viewtopic.php?t=66917
1997 855 GLT (Light Pressure Turbo) still going strong. Previous: 1986 240 GL rusted out in '06, 1985 Saab 900T rusted out in '95, 1975 Saab 99 rusted out in '95, 1973 Saab 99 rusted out in '94

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