Sometimes my brakes on my 1996 850R make a very loud vibration sound when trying to stop. Pads and rotors have been replaced too. Seems like it is only on extremely hot days, say 90-95 F.

Any ideas? What can I look for/try/check?

Thanks in advance.

Guy

 

Does it sound Like a Big Bass box in the trunk.

Like you are playing music with only Bass and it is really loud like rumbling the car?

What kind of Brake parts are the new ones?

 

Mine do the same thing. I have changed brake pads, had the rotors resurfaced, and it still will do it when hot. I changed to cross-drilled rotors about 1 1/2 years ago thinking the rotor may be bad. Still does it however.

 

Forgot to add, vehicle is a 1995 850 Turbo

 

Are your pads flat all the way across?
Or are the angled on each side?

You might need to install the Half Shims.

 

Tech,
It does sound like the bass except very loud and annoying. The front and the read pads are new. I believe the rear pads are flat all the way across and the front are angled at the start and the end of the pad. The rotors have been turned and I have always had them turned on all my Volvo's by the same shop with very good success. Again, it only does it occassionally when it is HOT outside. say 90 - 95 F.

Do you still think half shims? What do they do? Both front and rear brakes too? Where can you get them?

Please advise.

Thanks in advance.

Guy

 

Do you get a vibration when you step on the brakes? I would double check the rotors...especially if they're the cheap ones for like $30 and also what pads are you using??? The 850 is a heavy car and the normal pads would heat quick, and one stomp on the pads would warp the rotors. (Just from experience)

I would use Brembo blanks and some type of ceramic pads or performance pads

just my 2psi

 

I had the same problem. You have to put the half shims on the rear brakes. You go to the dealer and tell them you need the half shims and they will know exactly what you are talking about. Fixed my problem right up. I use nothing but OEM pads too. I have tried others, but they squeal. I will trade squeal for dust any time. My wheels always look dirty, but my car stops and I have no squeal or vibration.

 

The Half shims make the Pads hit the rotors Slightly at an angle. This prevents the noise you hear..

But it still could be rotors. If the rotors are OEM parts they HATE to be turned.

Dealer for the Parts.

 

I think you should try the half shims first. It's a cheap thing to try and will only take you about 1/2 hour to put them on. If that doesn't fix the problem then think about new rotors. I never have my rotors turned any more. I just buy new ones when they get vibration.

 

Ok I will get the half shims from the dealer and try that first.

Thanks for the help......

 

Maddux,

Did you get the half shims from the dealer and get them installed. Did it correct the problem?

 

I know this is an old post but I joined hoping to find the answer to my problem and I did is just that the day after I felt the HUGE vibration I realized that I had thrown away the half shims and there is no volvo dealer aroound here. can I get from a different source

Thanks Chris C

 

I believe only the Dealer sells them.

 

Added the half shims from the dealer corrected the problem for 1 month now. Cost - $14. Be sure to ask them the proper orientation, the shimmed part goes the direction the wheels turn. Use lithium grease between the shim and the piston and between the shim and the brake pad.

Guy

 

Hey thehost, try this as a place to buy the half shims. It's a Volvo Dealer in Olympia, WA. I have ordered parts from them. You can call them at 1-888-273-7935.

https://www.volvoparts.com/index.asp

 

To add for the orientation Put the arrows up.