How can you tell when your hydraulic Modulator is going bad?
Volvo Q&AAsk Your Question
1999 Volvo S70 Question: Hydraulic Modulator
Answer #1Bret Bodas from RepairPal Test Shop, July 07, 2010, 08:09Master
If you're talking about your ABS Modulator, then I suspect your ABS light is on and there's a code for the ABS Pump Motor? If so, this is a control unit issue. The unit can be rebuilt or replaced to address this.
If I'm off base here, provide some more info so I can better advise you.