"Roy Bolton" <firstname.lastname@example.org> wrote:
> Anyone any ideas and comments about this one. 1996 volvo 850 2 litre 20
> valve. Sent it into the mechanic, brakes very spongy becoming harder with
> the next press of the pedal.
If the rotor is warped, it pushes the pistons back causing more pedal
travel. Wear does not cause this since the pistons should stay just
slightly above the surface no matter where that surface is if there is
no wobble in the rotor. Of course air in the line will cause sponginess
but that usually doesn't go away when you pump the brakes.
By the way, the main causes of warped rotors are improper torquing of
the lug nuts and high speed stops.
Cheers, Steve Henning in Reading, PA, USA
Owned '67,'68,'71,'74,'79,'81,'87,'93,'95 & '01 Volvos.
The '67,'74,'79,'87,'95 and '01 through European Delivery.