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Thread: After front brake job

  1. #1
    Join Date
    Nov 2009
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    New England USA
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    58

    Default After front brake job

    Hi,
    I have 2004 XC70, 160K on it.
    My friend and I replaced front rotors and pads. Everything went quick and easy except brake pedal is deeper and softer afterwords. We tried to bleed air bubbles (couldn't see any) on all brakes. It improved a tiny bit, but still doesn't feel solid.

    Is my master cylinder is going? Any electric to adjust? We just cannot figure it out...

    Please advise.
    Thank you!

  2. #2
    Join Date
    Oct 2011
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    Northshore - Great Lakes
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    How is fluid level?
    2001 V70XC - Nautic Blue/ 2-tone Sand/ Premium/ Instant MPG 12 - 63/ Pirelli P4 12/32" - 740/ Duracell 48/ MOBIL-3309/ Pennzoil EURO 5W-40/ Zimmerman Z-coated/ Akebono/ 190K-mi/ Great Lakes

  3. #3
    Join Date
    Dec 2010
    Location
    Cumbria, UK. Maine USA.
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    Default

    The backing surface flange for the disc clean with no foreign material impeding a solid mount, caliper mountings secure and correct, or you could have a semi stuck piston, did they retract easily and smoothly when pushed back in for the new pads, the caliper is a floating type so it should move easily on its guides, The replacement of pads usually does not require any bleeding unless you pushed a piston out when the pads were removed.

  4. #4
    Join Date
    Oct 2009
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    Spain
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    Default

    Click image for larger version. 

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    Did you reinstall the springs correctly? If not can give you a soft pedal, compare with rear brakes

  5. #5
    Join Date
    Feb 2010
    Location
    Virginia Beach
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    Default

    The front spring is in wrong.

    I'd bet $100 on that.

    You wouldn't be the first...

    http://www.volvoxc.com/forums/showth...-changing-pads
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (100K, Michelin AS3+, M1 0W40)
    2002 V70-XC (238K, Castrol Edge 0W40)
    2002 V70-T5 (195K, IPD bars, Bilsteins)
    2001 V70-T5 (76K)
    1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)

  6. #6
    Join Date
    Nov 2009
    Location
    New England USA
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    Default

    Thank you Xheart, AKAMick, juanpen, and Astro14.
    We added fluid when we bled air, so It maybe wrong spring installation. I took photos of left front one. Does it look correct? Please advise.

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    Thank you again!

  7. #7
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    Boston, MA
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    If nothing mentioned above helps, try to toggle ABS valves in DiCE/VIDA and bleed with Motiv bleeder under max pressure (it is capable of about 25..30 PSI).
    2002 V70 (sold)
    2005 XC70 (Telos Road took it. Did a chassis swap)
    2016 XC60

  8. #8
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    Mar 2005
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    Pacific Northwest
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    Quote Originally Posted by orvieto View Post
    Thank you Xheart, AKAMick, juanpen, and Astro14.
    so It maybe wrong spring installation. I took photos of left front one. Does it look correct? Please advise.

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    Yep, spring is wrong and therefore have no spring force. needs to be on the other side of the bracket ears its currently resting on. Imagine the floating caliper with no springed tension on the outside "rotating/twisting" upwards and towards the engine when you step on the brakes. Your pads/rotors will show partial contact on the outer portion of the rotor. Partial angled contact is what causes the deeper and softer pedal. Easy mistake and common. Here is pic for reference

    Past Volvos : 01 V70 T5, 01/02 V70XC, 02 V70 NA, 00 V70XC
    Current EV/Hybrid : 13 Tesla S85, 11 Gen3 Prius
    Friends cars under my care 17 Audi A4 Quattro DSG (B9) 05 Audi A4 Manual 6sp Quattro (B7) 04 e320 V6 Auto, 05 Accord 2.4, 08 Element 2.4, 08 Camry Hybrid
    Past Others : 01/03 VW MK4 Turbo/NA/01M. Gen1 Prius, Gen1 CRV, Gen2 Rav4, 02 Town&Country, 06 Corolla, 12 Audi A4 Quattro (B8), 07 Civic 1.6
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  9. #9
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    Nov 2009
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    New England USA
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    Thank you vti, howardc64, and everyone on this thread!

    Did it hurt the springs, rotors, and pads?
    I will fix it tomorrow and let you know.

    Thank you again!

    Quote Originally Posted by howardc64 View Post
    Yep, spring is wrong and therefore have no spring force. needs to be on the other side of the bracket ears its currently resting on. Imagine the floating caliper with no springed tension on the outside "rotating/twisting" upwards and towards the engine when you step on the brakes. Your pads/rotors will show partial contact on the outer portion of the rotor. Partial angled contact is what causes the deeper and softer pedal. Easy mistake and common. Here is pic for reference


  10. #10
    Join Date
    Mar 2005
    Location
    Pacific Northwest
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    1,918

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    Quote Originally Posted by orvieto View Post
    Did it hurt the springs, rotors, and pads?
    Assuming you haven't put a few thousand city stop and go miles on this. Probably just a little uneven wear and will even out after repair and some use. Firm brake pedal pressure will return as soon as spring is installed correctly. The properly tensioned caliper wlll squeeze the rotor evenly without twisting to provide majority of braking power even if the uneven wear might result in less contact area.
    Last edited by howardc64; 02-04-2017 at 12:04 AM.
    Past Volvos : 01 V70 T5, 01/02 V70XC, 02 V70 NA, 00 V70XC
    Current EV/Hybrid : 13 Tesla S85, 11 Gen3 Prius
    Friends cars under my care 17 Audi A4 Quattro DSG (B9) 05 Audi A4 Manual 6sp Quattro (B7) 04 e320 V6 Auto, 05 Accord 2.4, 08 Element 2.4, 08 Camry Hybrid
    Past Others : 01/03 VW MK4 Turbo/NA/01M. Gen1 Prius, Gen1 CRV, Gen2 Rav4, 02 Town&Country, 06 Corolla, 12 Audi A4 Quattro (B8), 07 Civic 1.6
    http://www.freewebs.com/howardsvolvos/

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