Question about 2001 Volvo V40

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Unbalanced rear wheel braking 1997 V40 Automatic

In recent mandatory state vehicle technical inspection this defect was found when testing braking force. The test indicated that left wheel was 0.75 and right wheel 1.26. What could be causing the lower braking ability on left side?

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  • reydelbife Sep 24, 2008

    Thanks for your prompt and comprehensive reply.

    I purchased the car from Volvo in Madrid, Spain in April of 1997. Upon failing the inspection I went right to the shop who has done all the maintenance on the car and they could find nothing after doing a thorough review of the system so we went back to the Inspection facility and re-ran the test on another test bed as there are 5 lanes in the building. The results were about the same or maybe even worse.

    There is no strange movement of the vehicle during braking and the unbalance is not at all discernible.

    Do you think that the line from the servo to the caliper might be damaged and could be restricting the flow of the brake fluid to that wheel? (Keep in mind though that the wear on the brake pads is about the same on both sides of the car). If so, I suppose that we could check this by visual inspection if we can locate the lines as I haven't a shop manual for the car. Please let me hear back from you on this.

    Thanks again and I look forward to hearing from you.

    Best regards,

    Walker W. Mitchell

    Madrid, Spain



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What year is this car 97 cant be correct,what state requires brake pressure test?/get a second test done some where else unless this car pulls or you have noticed a problem/or replace the left rear caliper if you beleave the test are correct

Posted on Sep 24, 2008

  • mark lail Sep 25, 2008

    thank you /the s/v 40 has a diagonal split brake system ,pressure to the right front and left rear (presure to the rear is reduced by a relief valve (pressure limiter) in each rear line and left front right rear/start by bleeding (all) brakes to remove any air/master cylinder next/ replace or switch rear pressure valves (volvo picture shows mounted below master cyl) ? did they say what spec should be for that car



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