Volvo V70 2.5 Brakes | Technical matters | Back Room Forum

Thu 4 Aug 2005 18:10

Volvo V70 2.5 Brakes - Spanner

A mate of mine has a 1999 Volvo V70 Estate Auto with the 2.5 10v engine. Recently it has developed a brake problem. Over the last week the brake pedal travel has increased, yet the car stops safely. We have checked the following; disc and pad thickness and DTV - all are text book and the pads have plenty of meat left on them, all flexible hoses are sound and are NOT ballooning up when brake pedal is pressed. We have changed brake fluid using a pressure bleeder (type that is pumped up using built in piston) and we even checked under the carpet near the pedal for leaks (bone dry) and whilst the pipes were still connected - we removed the master cylinder just off the servo so we could see the rear seal and push rod area and it too was bone dry.
The servo also behaves and after pumping the brakes with the engine off then starting it with the pedal hard on, it sinks slightly when the engine starts.
Can the master cylinder leak internally without showing external signs of leakage?
Many thanks in advance
Andrew

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