S70 brake squeal

If they didn't use Volvo pads, you probably won't be able to get rid of the squeal. The grease goes between the back of the pads and the wheel cylinders and is not a lubricant but a dampening agent. It functions like a shock absorber and tries to disipate resonant vibrations. If the pads are Volvo pads matched to Volvo discs, then the grease should work.

Good morning all. The Genuine pads I use on my V70 have a rubber coating on the back, replacing the need for grease. If you can't see any grease on the pads but they are genuine parts, you (probably) have no reason to change them. I agree with Mr Henning in that Pads MUST be the same make as the discs. The materials are carefully matched to each other to prevent squeal. I have used pattern discs on the rear, with matching pattern pads, and I have no squeals! There are also a couple of anti-squeal springs on my V70, and it's worth changing them when you do the pads. They don't last long.

Cheers. Joe landy. Peterborough UK.

I have non Volvo pads (Textar, a Volvo supplier) and discs (Zimmerman) on the rear of both my S70 and V70. The V70 for about a year and a half (30,000 km) the S70 for only a couple of months. No squeals or any other noise. However, there are some pads that are available that will squeal no matter what you do. Part of the problem is that exact physical dimension fits 240s,740s as well as older Mercedes and some BMWs. So this high volume entices some of the lower quality pad makers who make one pad that fits all, but doesn't work well in any. However if you get proper pads from a quality manufacturer, they'll work fine.

No really. The pads must match the rotor. Some rotors are softer and use softer pads. Some rotors are harder and can use harder pads. Volvo engineers sweat bullets getting a rotor and pad match that will not fade, is not noisy, will stop smoothly, is not toxic, will not wear too fast, and will not squeal. It is not a trivial task. Some very expensive pads will squeal if they are not used with the right rotor. Volvo uses all kinds of gimmicks to prevent brake squeal such as pad grease, rubber pads, springs, etc.

As someone else stated; it is best to buy pads that match the rotor. If you go with non-Volvo rotors, then you need to find compatible pads. The match-up is not trivial. If engineers could use any high quality pads, they would use ones that created much less brake dust.

Well, I've been using quality pads and quality discs from a variety of manufacturers on several types of Volvos for many years and have never had a problem with squealing or premature wear, so I guess I'm just lucky.

I'm not sure Volvo engineers do sweat bullets over this. I think it will be more of a case of Volvo engineers developing a spec (size, retardation etc) and passing that on to a third party to develop the brakes on their behalf.... and then selecting a solution on the basis of least cost

This is why Volvo pads are the same size/shape as those other manufacturers use...

Like Mike, I have used various rotor/pad combinations on various cars and not really had a problem....

The reason they sweat this is because owners take their cars back many times if the brakes squeal and complain. The only thing the shop can do is say they got a bad batch of pads and burn money by burnishing the rotor and replacing the pads properly. It is a very simple thing that can cause a lot of customer relations problems. If they get it right the first time, it is no sweat.

One reason they use such soft pads that give off tons of dust is to keep squealing down. The other reason is they can't use asbestos. In the good old days pads were much harder and cheap replacement pads were much more prone to cause squealing. Now with softer pads they even use a slightly softer metal in the rotor.