Guys heres the deal .On my 85 n/a regal with vacume brakes, The other day the rear wheel cyl blew , so thats fixed by a shop i limped the car to . They said the propotioning valve was bad maybe . I told them just fix the wheel cyl . So now the brakes are real soft , the light is on and the rear brake lights dont come on either . Going by that does that sound like the propotioning valve of the Master cyl . Someone out there with more experiance must have a better idea than me . Ok thanks please help asap .